Dr. Susheel Arora - Academia.edu (original) (raw)
Papers by Dr. Susheel Arora
Nucleation and Atmospheric Aerosols, 2013
The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 m... more The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 mol % with 2 mol % V2O5 glasses prepared by normal melt quench technique have been investigated by means of FT-IR & physical measurement techniques. With the addition of copper oxide (x ≤ 10 mol%), the frequency bands in the higher region shift towards lower wave number, suggest the conversion of BO3 to BO4 structural units, which in turn give rise to the formation of Non Bridging Oxygen’s (NBOs). For further increase in CuO (i.e. for x ≥ 10 mol %), the frequency bands shift towards higher wave number, indicate the formation of Bridging Oxygen’s (BOs). The FTIR analysis reveals that the present glass system is based on the BiO3 pyramidal, BiO6 octahedral units and also on BO3 and BO4 structural units. The systematic variation in density and molar volume in these glasses indicates the effect of CuO substitution.The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 mol % with 2 mol % V2O5 glasses prepared by normal melt quench technique have been investigated by means of FT-IR & physical measurement techniques. With the addition of copper oxide (x ≤ 10 mol%), the frequency bands in the higher region shift towards lower wave number, suggest the conversion of BO3 to BO4 structural units, which in turn give rise to the formation of Non Bridging Oxygen’s (NBOs). For further increase in CuO (i.e. for x ≥ 10 mol %), the frequency bands shift towards higher wave number, indicate the formation of Bridging Oxygen’s (BOs). The FTIR analysis reveals that the present glass system is based on the BiO3 pyramidal, BiO6 octahedral units and also on BO3 and BO4 structural units. The systematic variation in density and molar volume in these glasses indicates the effect of CuO substitution.
Turkish journal of physics, 2013
Zinc fluoroborate glasses with compositions xZnO.(40-x)LiF.60B 2 O3(x = 0, 5, 10, 15, and 20) wer... more Zinc fluoroborate glasses with compositions xZnO.(40-x)LiF.60B 2 O3(x = 0, 5, 10, 15, and 20) were synthesized by the melt-quench method. The amorphous nature of the glassy samples was confirmed by XRD analysis. The nature of the bonds formed and the role of various species in the composition of the glasses were examined using FTIR spectroscopy. FTIR analysis showed shifting of an absorption band with the addition of ZnO. A UV-visible study was carried out to calculate the optical band gap energy, E g. It was found that E g decreased with increase in concentration of ZnO up to x = 15 and increased slightly for x = 20 with the stepwise replacement of a nonoxide group (LiF) by an oxide group (ZnO). Urbach tail energy, E U , was found to increase from x = 0 to x = 15 and then decreased slightly for x = 20. Theoretical optical basicity, Λth , decreased with decrease in concentration of LiF.
PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013, 2013
ABSTRACT The role of CuO on the physical and electrical properties in x CuO.(25-x)Bi2O3.75B2O3(5&... more ABSTRACT The role of CuO on the physical and electrical properties in x CuO.(25-x)Bi2O3.75B2O3(5<=x<=20) glass system has been investigated. The glasses were prepared by normal melt quench technique. The density and molar volume of the glasses decreases with increase in CuO (mol %). The dc conductivity was measured in the temperature range 413-513 K. The conduction mechanism in these glasses was discussed in terms of small polaron hopping (SPH) theory proposed by Mott. The activation energy is found to decrease with increasing copper oxide content. The dc conductivity increases with increase in CuO content and ranging from 6.02×10-12 (Ωm)-1 to 1.096×10-10 (Ωm)-1 at 450K.
ISRN Spectroscopy (Online), Oct 18, 2012
The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositions xZnO • (... more The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositions xZnO • (40 − x)LiF • 60B 2 O 3 (x = 0, 5, 10, 15, and 20). Optical characterization was carried out to examine the variation of optical bandgap energy (E g) and urbach energy (E U) with respect to the concentration for the samples annealed at different temperatures (300 • C, 350 • C, and 400 • C). Annealing shows its effect on the samples with the variations in the values of E g and E U. These variations are explained on the basis of formation of different molecular species like BO 3 − units, boroxol rings, and the change in the number of nonbridging oxygen atoms.
ISRN Ceramics (Print), Jan 29, 2013
Fluoroborate glasses with Bi 2 O 3 content and having compositions xBi 2 O 3 ⋅ (40-x)LiF ⋅ 60B 2 ... more Fluoroborate glasses with Bi 2 O 3 content and having compositions xBi 2 O 3 ⋅ (40-x)LiF ⋅ 60B 2 O 3 (x = 0, 5, 10, 15, and 20) are prepared using melt-quench technique. DSC characterization is carried out to observe glass transition temperature. Two such temperatures are observed for each of the reported samples. DC conductivity of the reported samples is studied with the variation in temperature from 313 K to 413 K by dividing this range into three regions, namely, low-, intermediate-, and high-temperature regions. DC conductivity responses for these temperature regions are explained using different conductivity models.
TURKISH JOURNAL OF PHYSICS, 2013
Zinc fluoroborate glasses with compositions xZnO.(40-x)LiF.60B 2 O3(x = 0, 5, 10, 15, and 20) wer... more Zinc fluoroborate glasses with compositions xZnO.(40-x)LiF.60B 2 O3(x = 0, 5, 10, 15, and 20) were synthesized by the melt-quench method. The amorphous nature of the glassy samples was confirmed by XRD analysis. The nature of the bonds formed and the role of various species in the composition of the glasses were examined using FTIR spectroscopy. FTIR analysis showed shifting of an absorption band with the addition of ZnO. A UV-visible study was carried out to calculate the optical band gap energy, E g. It was found that E g decreased with increase in concentration of ZnO up to x = 15 and increased slightly for x = 20 with the stepwise replacement of a nonoxide group (LiF) by an oxide group (ZnO). Urbach tail energy, E U , was found to increase from x = 0 to x = 15 and then decreased slightly for x = 20. Theoretical optical basicity, Λth , decreased with decrease in concentration of LiF.
Tin oxide nanoparticles have been successfully synthesized via sol–gel process by using methanol ... more Tin oxide nanoparticles have been successfully synthesized via sol–gel process by using methanol as solvent. The as synthesized nanoparticles were characterized by means of powder X-ray diffraction (XRD), Scanning electron microscopy (SEM) and UV-Vis absorption spectroscopy. The X-ray study reveals the crystalline nature of the nanoparticles under study and SEM images confirms the existence of very small, uniformly spherical and non-agglomerated nanoparticles for annealed sample. The UV-Vis spectrum of the present nanoparticles has been obtained in the range 200-1100 nm and the optical band gap is found to be equal to 3.92 eV.
The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositions xZnO · (... more The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositions xZnO · (40− x)LiF · 60B2O3 (x = 0, 5, 10, 15, and 20). Optical characterization was carried out to examine the variation of optical bandgap energy (Eg) and urbach energy (EU) with respect to the concentration for the samples annealed at different temperatures (300◦C, 350◦C, and 400◦C). Annealing shows its effect on the samples with the variations in the values of Eg and EU . These variations are explained on the basis of formation of different molecular species like BO3 − units, boroxol rings, and the change in the number of nonbridging oxygen atoms.
ISRN Spectroscopy, 2012
Bismuth fluoroborate glasses with compositions xBi2O3·(40 − x)LiF·60 B2O3 (x = 0, 5, 10, 15, and ... more Bismuth fluoroborate glasses with compositions xBi2O3·(40 − x)LiF·60 B2O3 (x = 0, 5, 10, 15, and 20) are synthesized by melt-quench method. XRD pattern is obtained for all the samples to confirm their amorphous nature. FTIR spectroscopy is carried out for the reported samples. It reflects the effect of replacement of a non-oxide group (LiF) with an oxide group (Bi2O3) in the glass network, due to the presence of the various absorption bands and their shifting with such replacement, assigning a role of network modifier to Bi2O3. Density and molar volume show an increase in their values with increase in Bi2O3 concentration. Theoretical optical basicity is calculated for the reported samples, which shows a decreasing trend with the increasing concentration of Bi2O3.
ISRN Optics, 2012
Bismuth fluoroborate glasses with compositions xBi2O3⋅(40-x)LiF⋅60 B2O3 (x=0,5,10,15, and 20)... more Bismuth fluoroborate glasses with compositions xBi2O3⋅(40-x)LiF⋅60 B2O3 (x=0,5,10,15, and 20) are synthesized by melt-quench method. Optical characterization was carried out to examine variation of optical band gap energy (Eg) and Urbach energy (EU) with respect to the concentration. It reflects the effect of stepwise replacement of non-oxide and less polarizable LiF by an oxide and more polarizable (Bi2O3) group on the optical properties of the samples. The value of Eg decreases with increase in concentration of Bi2O3. The samples were subjected to annealing at different temperatures (300°C, 350°C, and 400°C), and the effect of annealing on the optical properties of various samples was again studied. Annealing affects remarkably the values of Eg and EU in the samples with x=0.
ISRN Ceramics, 2013
Fluoroborate glasses with Bi2O3 content and having compositions xBi2O3 · (40-x)LiF · 60B2O3 (x = ... more Fluoroborate glasses with Bi2O3 content and having compositions xBi2O3 · (40-x)LiF · 60B2O3 (x = 0, 5, 10, 15, and 20) are prepared using melt-quench technique. DSC characterization is carried out to observe glass transition temperature. Two such temperatures are observed for each of the reported samples. DC conductivity of the reported samples is studied with the variation in temperature from 313 K to 413 K by dividing this range into three regions, namely, low-, intermediate-, and high-temperature regions. DC conductivity responses for these temperature regions are explained using different conductivity models.
ISRN Spectroscopy, 2012
The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositionsxZnO·(40−... more The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositionsxZnO·(40−x)LiF·60B2O3(x=0, 5, 10, 15, and 20). Optical characterization was carried out to examine the variation of optical bandgap energy (Eg) and urbach energy (EU) with respect to the concentration for the samples annealed at different temperatures (300°C,350°C,and400°C). Annealing shows its effect on the samples with the variations in the values ofEgandEU. These variations are explained on the basis of formation of different molecular species likeBO3-units, boroxol rings, and the change in the number of nonbridging oxygen atoms.
AIP Conference Proceedings, 2013
Melt-quench technique has been used to prepare fluoroborate glasses with ZnO content and having c... more Melt-quench technique has been used to prepare fluoroborate glasses with ZnO content and having compositions x ZnO. (40-x) LiF. 60 B2O3 (x = 0, 5, 10, 15 and 20). DSC characterization is carried out to observe glass transition temperature. Two glass transition temperatures are observed for each of the reported samples. Both transition temperatures are found to increase with increase in ZnO content. DC conductivity is examined with respect to temperature variations. Results show that the conductivity is ionic in nature and varies with the variations in ZnO concentration.
AIP Conference Proceedings, 2013
The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 m... more The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 mol % with 2 mol % V2O5 glasses prepared by normal melt quench technique have been investigated by means of FT-IR & physical measurement techniques. With the addition of copper oxide (x ≤ 10 mol%), the frequency bands in the higher region shift towards lower wave number, suggest the conversion of BO3 to BO4 structural units, which in turn give rise to the formation of Non Bridging Oxygen’s (NBOs). For further increase in CuO (i.e. for x ≥ 10 mol %), the frequency bands shift towards higher wave number, indicate the formation of Bridging Oxygen’s (BOs). The FTIR analysis reveals that the present glass system is based on the BiO3 pyramidal, BiO6 octahedral units and also on BO3 and BO4 structural units. The systematic variation in density and molar volume in these glasses indicates the effect of CuO substitution.The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 mol % with 2 mol % V2O5 glasses prepared by normal melt quench technique have been investigated by means of FT-IR & physical measurement techniques. With the addition of copper oxide (x ≤ 10 mol%), the frequency bands in the higher region shift towards lower wave number, suggest the conversion of BO3 to BO4 structural units, which in turn give rise to the formation of Non Bridging Oxygen’s (NBOs). For further increase in CuO (i.e. for x ≥ 10 mol %), the frequency bands shift towards higher wave number, indicate the formation of Bridging Oxygen’s (BOs). The FTIR analysis reveals that the present glass system is based on the BiO3 pyramidal, BiO6 octahedral units and also on BO3 and BO4 structural units. The systematic variation in density and molar volume in these glasses indicates the effect of CuO substitution.
AIP Conference Proceedings, 2013
ABSTRACT The role of CuO on the physical and electrical properties in x CuO.(25-x)Bi2O3.75B2O3(5&... more ABSTRACT The role of CuO on the physical and electrical properties in x CuO.(25-x)Bi2O3.75B2O3(5<=x<=20) glass system has been investigated. The glasses were prepared by normal melt quench technique. The density and molar volume of the glasses decreases with increase in CuO (mol %). The dc conductivity was measured in the temperature range 413-513 K. The conduction mechanism in these glasses was discussed in terms of small polaron hopping (SPH) theory proposed by Mott. The activation energy is found to decrease with increasing copper oxide content. The dc conductivity increases with increase in CuO content and ranging from 6.02×10-12 (Ωm)-1 to 1.096×10-10 (Ωm)-1 at 450K.
Solid State Ionics, 2021
Abstract Lithium borate glasses prepared by melt-quench technique have been studied with a view t... more Abstract Lithium borate glasses prepared by melt-quench technique have been studied with a view to ascertain their structural and electrical properties. FTIR analysis of the present samples reveals the absence of boroxol rings, presence of structural units of lithium formed with oxygen and increase in the number of Non-Bridging Oxygens (NBOs) in the glass system. The real and imaginary parts of dielectric constant increase with frequency and temperature arises due to interfacial ionic polarization. The non-exponential Kohlrausch-Williams-Watts (KWW) function has been found to follow by the imaginary part of electric modulus, thereby confirming its applicability. The fitting of data of ac conductivity as per Jonscher's universal power law indicates hoppable ion concentration dependent upon temperature and Li2O content. The analysis is further supported by the variations of ac-conductivity as well as the activation energy for dc conductivity. A decrease in impedance and increase in the space charge polarization is observed with increasing Li2O concentration. Further, the electrical behavior of samples has been investigated via an impedance equivalent circuit corresponding to the Nyquist plot.
Nucleation and Atmospheric Aerosols, 2013
The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 m... more The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 mol % with 2 mol % V2O5 glasses prepared by normal melt quench technique have been investigated by means of FT-IR & physical measurement techniques. With the addition of copper oxide (x ≤ 10 mol%), the frequency bands in the higher region shift towards lower wave number, suggest the conversion of BO3 to BO4 structural units, which in turn give rise to the formation of Non Bridging Oxygen’s (NBOs). For further increase in CuO (i.e. for x ≥ 10 mol %), the frequency bands shift towards higher wave number, indicate the formation of Bridging Oxygen’s (BOs). The FTIR analysis reveals that the present glass system is based on the BiO3 pyramidal, BiO6 octahedral units and also on BO3 and BO4 structural units. The systematic variation in density and molar volume in these glasses indicates the effect of CuO substitution.The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 mol % with 2 mol % V2O5 glasses prepared by normal melt quench technique have been investigated by means of FT-IR & physical measurement techniques. With the addition of copper oxide (x ≤ 10 mol%), the frequency bands in the higher region shift towards lower wave number, suggest the conversion of BO3 to BO4 structural units, which in turn give rise to the formation of Non Bridging Oxygen’s (NBOs). For further increase in CuO (i.e. for x ≥ 10 mol %), the frequency bands shift towards higher wave number, indicate the formation of Bridging Oxygen’s (BOs). The FTIR analysis reveals that the present glass system is based on the BiO3 pyramidal, BiO6 octahedral units and also on BO3 and BO4 structural units. The systematic variation in density and molar volume in these glasses indicates the effect of CuO substitution.
Turkish journal of physics, 2013
Zinc fluoroborate glasses with compositions xZnO.(40-x)LiF.60B 2 O3(x = 0, 5, 10, 15, and 20) wer... more Zinc fluoroborate glasses with compositions xZnO.(40-x)LiF.60B 2 O3(x = 0, 5, 10, 15, and 20) were synthesized by the melt-quench method. The amorphous nature of the glassy samples was confirmed by XRD analysis. The nature of the bonds formed and the role of various species in the composition of the glasses were examined using FTIR spectroscopy. FTIR analysis showed shifting of an absorption band with the addition of ZnO. A UV-visible study was carried out to calculate the optical band gap energy, E g. It was found that E g decreased with increase in concentration of ZnO up to x = 15 and increased slightly for x = 20 with the stepwise replacement of a nonoxide group (LiF) by an oxide group (ZnO). Urbach tail energy, E U , was found to increase from x = 0 to x = 15 and then decreased slightly for x = 20. Theoretical optical basicity, Λth , decreased with decrease in concentration of LiF.
PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013, 2013
ABSTRACT The role of CuO on the physical and electrical properties in x CuO.(25-x)Bi2O3.75B2O3(5&... more ABSTRACT The role of CuO on the physical and electrical properties in x CuO.(25-x)Bi2O3.75B2O3(5<=x<=20) glass system has been investigated. The glasses were prepared by normal melt quench technique. The density and molar volume of the glasses decreases with increase in CuO (mol %). The dc conductivity was measured in the temperature range 413-513 K. The conduction mechanism in these glasses was discussed in terms of small polaron hopping (SPH) theory proposed by Mott. The activation energy is found to decrease with increasing copper oxide content. The dc conductivity increases with increase in CuO content and ranging from 6.02×10-12 (Ωm)-1 to 1.096×10-10 (Ωm)-1 at 450K.
ISRN Spectroscopy (Online), Oct 18, 2012
The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositions xZnO • (... more The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositions xZnO • (40 − x)LiF • 60B 2 O 3 (x = 0, 5, 10, 15, and 20). Optical characterization was carried out to examine the variation of optical bandgap energy (E g) and urbach energy (E U) with respect to the concentration for the samples annealed at different temperatures (300 • C, 350 • C, and 400 • C). Annealing shows its effect on the samples with the variations in the values of E g and E U. These variations are explained on the basis of formation of different molecular species like BO 3 − units, boroxol rings, and the change in the number of nonbridging oxygen atoms.
ISRN Ceramics (Print), Jan 29, 2013
Fluoroborate glasses with Bi 2 O 3 content and having compositions xBi 2 O 3 ⋅ (40-x)LiF ⋅ 60B 2 ... more Fluoroborate glasses with Bi 2 O 3 content and having compositions xBi 2 O 3 ⋅ (40-x)LiF ⋅ 60B 2 O 3 (x = 0, 5, 10, 15, and 20) are prepared using melt-quench technique. DSC characterization is carried out to observe glass transition temperature. Two such temperatures are observed for each of the reported samples. DC conductivity of the reported samples is studied with the variation in temperature from 313 K to 413 K by dividing this range into three regions, namely, low-, intermediate-, and high-temperature regions. DC conductivity responses for these temperature regions are explained using different conductivity models.
TURKISH JOURNAL OF PHYSICS, 2013
Zinc fluoroborate glasses with compositions xZnO.(40-x)LiF.60B 2 O3(x = 0, 5, 10, 15, and 20) wer... more Zinc fluoroborate glasses with compositions xZnO.(40-x)LiF.60B 2 O3(x = 0, 5, 10, 15, and 20) were synthesized by the melt-quench method. The amorphous nature of the glassy samples was confirmed by XRD analysis. The nature of the bonds formed and the role of various species in the composition of the glasses were examined using FTIR spectroscopy. FTIR analysis showed shifting of an absorption band with the addition of ZnO. A UV-visible study was carried out to calculate the optical band gap energy, E g. It was found that E g decreased with increase in concentration of ZnO up to x = 15 and increased slightly for x = 20 with the stepwise replacement of a nonoxide group (LiF) by an oxide group (ZnO). Urbach tail energy, E U , was found to increase from x = 0 to x = 15 and then decreased slightly for x = 20. Theoretical optical basicity, Λth , decreased with decrease in concentration of LiF.
Tin oxide nanoparticles have been successfully synthesized via sol–gel process by using methanol ... more Tin oxide nanoparticles have been successfully synthesized via sol–gel process by using methanol as solvent. The as synthesized nanoparticles were characterized by means of powder X-ray diffraction (XRD), Scanning electron microscopy (SEM) and UV-Vis absorption spectroscopy. The X-ray study reveals the crystalline nature of the nanoparticles under study and SEM images confirms the existence of very small, uniformly spherical and non-agglomerated nanoparticles for annealed sample. The UV-Vis spectrum of the present nanoparticles has been obtained in the range 200-1100 nm and the optical band gap is found to be equal to 3.92 eV.
The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositions xZnO · (... more The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositions xZnO · (40− x)LiF · 60B2O3 (x = 0, 5, 10, 15, and 20). Optical characterization was carried out to examine the variation of optical bandgap energy (Eg) and urbach energy (EU) with respect to the concentration for the samples annealed at different temperatures (300◦C, 350◦C, and 400◦C). Annealing shows its effect on the samples with the variations in the values of Eg and EU . These variations are explained on the basis of formation of different molecular species like BO3 − units, boroxol rings, and the change in the number of nonbridging oxygen atoms.
ISRN Spectroscopy, 2012
Bismuth fluoroborate glasses with compositions xBi2O3·(40 − x)LiF·60 B2O3 (x = 0, 5, 10, 15, and ... more Bismuth fluoroborate glasses with compositions xBi2O3·(40 − x)LiF·60 B2O3 (x = 0, 5, 10, 15, and 20) are synthesized by melt-quench method. XRD pattern is obtained for all the samples to confirm their amorphous nature. FTIR spectroscopy is carried out for the reported samples. It reflects the effect of replacement of a non-oxide group (LiF) with an oxide group (Bi2O3) in the glass network, due to the presence of the various absorption bands and their shifting with such replacement, assigning a role of network modifier to Bi2O3. Density and molar volume show an increase in their values with increase in Bi2O3 concentration. Theoretical optical basicity is calculated for the reported samples, which shows a decreasing trend with the increasing concentration of Bi2O3.
ISRN Optics, 2012
Bismuth fluoroborate glasses with compositions xBi2O3⋅(40-x)LiF⋅60 B2O3 (x=0,5,10,15, and 20)... more Bismuth fluoroborate glasses with compositions xBi2O3⋅(40-x)LiF⋅60 B2O3 (x=0,5,10,15, and 20) are synthesized by melt-quench method. Optical characterization was carried out to examine variation of optical band gap energy (Eg) and Urbach energy (EU) with respect to the concentration. It reflects the effect of stepwise replacement of non-oxide and less polarizable LiF by an oxide and more polarizable (Bi2O3) group on the optical properties of the samples. The value of Eg decreases with increase in concentration of Bi2O3. The samples were subjected to annealing at different temperatures (300°C, 350°C, and 400°C), and the effect of annealing on the optical properties of various samples was again studied. Annealing affects remarkably the values of Eg and EU in the samples with x=0.
ISRN Ceramics, 2013
Fluoroborate glasses with Bi2O3 content and having compositions xBi2O3 · (40-x)LiF · 60B2O3 (x = ... more Fluoroborate glasses with Bi2O3 content and having compositions xBi2O3 · (40-x)LiF · 60B2O3 (x = 0, 5, 10, 15, and 20) are prepared using melt-quench technique. DSC characterization is carried out to observe glass transition temperature. Two such temperatures are observed for each of the reported samples. DC conductivity of the reported samples is studied with the variation in temperature from 313 K to 413 K by dividing this range into three regions, namely, low-, intermediate-, and high-temperature regions. DC conductivity responses for these temperature regions are explained using different conductivity models.
ISRN Spectroscopy, 2012
The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositionsxZnO·(40−... more The Melt-quench method is used to synthesize zinc fluoroborate glasses with compositionsxZnO·(40−x)LiF·60B2O3(x=0, 5, 10, 15, and 20). Optical characterization was carried out to examine the variation of optical bandgap energy (Eg) and urbach energy (EU) with respect to the concentration for the samples annealed at different temperatures (300°C,350°C,and400°C). Annealing shows its effect on the samples with the variations in the values ofEgandEU. These variations are explained on the basis of formation of different molecular species likeBO3-units, boroxol rings, and the change in the number of nonbridging oxygen atoms.
AIP Conference Proceedings, 2013
Melt-quench technique has been used to prepare fluoroborate glasses with ZnO content and having c... more Melt-quench technique has been used to prepare fluoroborate glasses with ZnO content and having compositions x ZnO. (40-x) LiF. 60 B2O3 (x = 0, 5, 10, 15 and 20). DSC characterization is carried out to observe glass transition temperature. Two glass transition temperatures are observed for each of the reported samples. Both transition temperatures are found to increase with increase in ZnO content. DC conductivity is examined with respect to temperature variations. Results show that the conductivity is ionic in nature and varies with the variations in ZnO concentration.
AIP Conference Proceedings, 2013
The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 m... more The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 mol % with 2 mol % V2O5 glasses prepared by normal melt quench technique have been investigated by means of FT-IR & physical measurement techniques. With the addition of copper oxide (x ≤ 10 mol%), the frequency bands in the higher region shift towards lower wave number, suggest the conversion of BO3 to BO4 structural units, which in turn give rise to the formation of Non Bridging Oxygen’s (NBOs). For further increase in CuO (i.e. for x ≥ 10 mol %), the frequency bands shift towards higher wave number, indicate the formation of Bridging Oxygen’s (BOs). The FTIR analysis reveals that the present glass system is based on the BiO3 pyramidal, BiO6 octahedral units and also on BO3 and BO4 structural units. The systematic variation in density and molar volume in these glasses indicates the effect of CuO substitution.The structural and physical properties of xCuO(30−x)Bi2O3−70B2O3; x = 0, 5, 10, 15, 20 & 25 mol % with 2 mol % V2O5 glasses prepared by normal melt quench technique have been investigated by means of FT-IR & physical measurement techniques. With the addition of copper oxide (x ≤ 10 mol%), the frequency bands in the higher region shift towards lower wave number, suggest the conversion of BO3 to BO4 structural units, which in turn give rise to the formation of Non Bridging Oxygen’s (NBOs). For further increase in CuO (i.e. for x ≥ 10 mol %), the frequency bands shift towards higher wave number, indicate the formation of Bridging Oxygen’s (BOs). The FTIR analysis reveals that the present glass system is based on the BiO3 pyramidal, BiO6 octahedral units and also on BO3 and BO4 structural units. The systematic variation in density and molar volume in these glasses indicates the effect of CuO substitution.
AIP Conference Proceedings, 2013
ABSTRACT The role of CuO on the physical and electrical properties in x CuO.(25-x)Bi2O3.75B2O3(5&... more ABSTRACT The role of CuO on the physical and electrical properties in x CuO.(25-x)Bi2O3.75B2O3(5<=x<=20) glass system has been investigated. The glasses were prepared by normal melt quench technique. The density and molar volume of the glasses decreases with increase in CuO (mol %). The dc conductivity was measured in the temperature range 413-513 K. The conduction mechanism in these glasses was discussed in terms of small polaron hopping (SPH) theory proposed by Mott. The activation energy is found to decrease with increasing copper oxide content. The dc conductivity increases with increase in CuO content and ranging from 6.02×10-12 (Ωm)-1 to 1.096×10-10 (Ωm)-1 at 450K.
Solid State Ionics, 2021
Abstract Lithium borate glasses prepared by melt-quench technique have been studied with a view t... more Abstract Lithium borate glasses prepared by melt-quench technique have been studied with a view to ascertain their structural and electrical properties. FTIR analysis of the present samples reveals the absence of boroxol rings, presence of structural units of lithium formed with oxygen and increase in the number of Non-Bridging Oxygens (NBOs) in the glass system. The real and imaginary parts of dielectric constant increase with frequency and temperature arises due to interfacial ionic polarization. The non-exponential Kohlrausch-Williams-Watts (KWW) function has been found to follow by the imaginary part of electric modulus, thereby confirming its applicability. The fitting of data of ac conductivity as per Jonscher's universal power law indicates hoppable ion concentration dependent upon temperature and Li2O content. The analysis is further supported by the variations of ac-conductivity as well as the activation energy for dc conductivity. A decrease in impedance and increase in the space charge polarization is observed with increasing Li2O concentration. Further, the electrical behavior of samples has been investigated via an impedance equivalent circuit corresponding to the Nyquist plot.