Study of structure and properties of ZnO–Bi2O3–P2O5 glasses (original) (raw)
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Structure and properties of ZnO–B2O3–P2O5–TeO2 glasses
Materials Chemistry and Physics, 2010
Zinc borophosphate glasses doped with TeO 2 were studied in the compositional series (100 − x)[0.5ZnO-0.1B 2 O 3 -0.4P 2 O 5 ]-xTeO 2 in a broad concentration range of x = 0-80 mol% TeO 2 . The structure of the glasses was studied by Raman and IR spectroscopy and by 31 P and 11 B MAS NMR spectroscopy. According to the Raman and IR spectra, TeO 2 is incorporated in the structural network in the form of TeO 3 , TeO 3+1 and TeO 4 structural units. The ratio of TeO 4 /TeO 3 increases with increasing TeO 2 content in the glasses. The incorporation of TeO x units into the glass network is associated with the depolymerisation of phosphate chains, as revealed by Raman spectroscopy. The incorporation of TeO 2 modifies also the coordination of boron atoms, where B(OP) 4 structural units are gradually replaced by B(OP) 4−n (OTe) n units. The addition of TeO 2 to the parent zinc borophosphate glass results in a decrease of glass transition temperature associated with the replacement of stronger P-O and B-O bonds by weaker Te-O bonds. Chemical durability of glasses reveals a minimum at the glass containing 10 mol% TeO 2 , but with further additions of TeO 2 it improves and the glasses with a high TeO 2 content reveal better durability than the parent zinc borophosphate glass.
Role of Bi2O3 content on physical, optical and vibrational studies in Bi2O3–ZnO–B2O3 glasses
Journal of Alloys and Compounds, 2008
Glasses with composition (85−x)Bi2O3–xZnO–15B2O3 with 15 ≤ x ≤ 40 have been prepared by conventional melt quench technique. Systematic variation in density and molar volume in these glasses indicates the effect of Bi2O3 on the glass structure. The parameters glass transition temperature (Tg), change in the transition temperature (ΔTg) and specific heat capacity difference (ΔCp) in the glass transition range were measured. The values of optical band gap and theoretical optical basicity are also reported. Raman and infrared studies have been employed on these glasses in order to obtain information regarding the competitive role of Bi2O3 in the formation of glass network.
Structure and properties of zinc bismuth phosphate glass
Thin Solid Films, 2010
In the present work, ZnO-Bi 2 O 3 -P 2 O 5 glasses were studied to examine the effect of the Bi 2 O 3 composition on the structure and properties of the phosphate glass system. Glasses with the compositions, I: (50 − 2x)ZnO-xBi 2 O 3 − (50 + x)P 2 O 5 and II: (50 − x)ZnO-xBi 2 O 3 -50P 2 O 5 (x = 0− 20 mol%) were prepared. To investigate the relation between the structural change and compositional change, the structure was measured by FT-IR analysis and the density, glass transition temperature (T g ) and chemical properties of the glasses were measured. The T g and chemical properties (water-resistant qualities) increased with increasing metaphosphate phase in the glasses, due to the increase in the number of bridging oxygens. The glass properties were dependent on the O/P ratio. The compositional variations that changed the dominant phosphate structure from a metaphosphate to a pyrophosphate were accompanied by the transformation in the dominant Bi coordination, complicating the effect that Bi 2 O 3 has on the glass properties. Bi 3+ cations were incorporated into the glass network and difference in the Bi-O bonding state in the glasses.
Borophosphate glasses of the ZnO–B2O3–P2O5 system
Materials Letters, 2000
Twenty-eight samples of the ZnO-B O -P O system were prepared by cooling the melt from 12308C in the 2 3 2 5 compositional series containing 30, 40, 50 and 60 mol.% of ZnO. A large glass-forming region was found at the phosphate side of the ternary system with homogeneous glasses containing up to 20-40 mol.% of B O . For these glasses, the density, 2 3 r, molar volume, V , thermal expansion coefficient, a , glass transformation temperature, T , and dilatation softening M g temperature, T , were determined. The values of V and a decrease with increasing B O content, while T and T d M 2 3 g d increase. The reason for the observed changes is the incorporation of trigonal BO and tetrahedral BO units into the 3 4
Journal of Non-Crystalline Solids, 2011
The variation in physical, structural and electrical properties has been studied as a function of Bi 2 O 3 content in 20ZnF 2-(10 + x) Bi 2 O 3-(70-x) P 2 O 5 , 0≤ x ≤ 10 mol% glasses, which were prepared by melt quenching technique and characterized by differential thermal analysis (DTA). Colorless samples, which have no absorption peaks, are obtained for 10 and 12 mol% of Bi 2 O 3 and the glasses are slowly becoming brownish from 15 to 20 mol% of Bi 2 O 3 which exhibit two absorption peaks at~370 nm,~450 nm correspond to Bi°t ransitions 4 S 3/2 → 2 P 3/2 and 4 S 3/2 → 2 P 1/2 respectively. The decrease in 3 P 1 → 1 S 0 transition of Bi 3+ photo luminescence emission for 18 and 20 mol% of Bi 2 O 3 and increase in optical absorption area shows the reduction of Bi 3+ to Bi°. From FTIR studies it is observed that an addition of Bi 2 O 3 decreases the P-O-P covalent bond by forming P-O-Bi bonds due to high polarizing nature of Bi 3+ ions. Dielectric parameters like ε', tan δ and a.c. conductivity σ ac are found to increase and activation energy for a.c. conduction is found to decrease with the increase in the concentration of Bi 2 O 3. Density of defect energy states is found to increase for higher concentration of Bi 2 O 3 and is discussed according to quantum mechanical tunneling (QMT) model.
Thermal behaviour and fragility of Sb2O3-containing zinc borophosphate glasses
Journal of Thermal Analysis and Calorimetry, 2008
Phosphate and borophosphate glasses have been studied in recent years for various technological applications . One of them is for glass-to-metal seals due to their low melting temperature and low viscosity. Borophosphate glasses reveal higher chemical durability than phosphate glasses due to the incorporation of boron oxide into the structural network, mostly in the form of BO 4 tetrahedra, which transform metaphosphate chains into three-dimensional network . Zinc borophosphate glasses were studied in several papers . Glass-forming region in the ZnO-B 2 O 3 -P 2 O 5 ternary system was published in 1975 by Ushakov et al. [3]. Clinton and Coffeen [4] studied zinc borophosphate glasses for the application as packaging and enameling solder glasses and Brow and Tallant [2] for seals in flat panel displays. Structure of zinc borophosphate glasses in the compositional series of xB 2 O 3 (1-x)Zn(PO 3 ) 2 was studied by Brow [5] using XPS and 11 B MAS NMR. By curve fitting of O1s spectra he obtained the relative concentrations of P-O-P, P-O-Zn and P-O-B bonds in these glasses. Brow and Tallant [2] studied the structure of Zn(PO 3 ) 2 -B 2 O 3 and Zn 2 P 2 O 7 -B 2 O 3 glasses with 31 P and 11 B MAS NMR technique and Raman spectroscopy. From these studies they proposed a model of the evolution of glass structure from phosphate to borophosphate network. The relations between structure and physical properties of glasses within ZnO-B 2 O 3 -P 2 O 5 ternary system were studied in [6] within several different compositional series.
Thermal studies of ZnO–B2O3–P2O5–TeO2 glasses
Journal of Thermal Analysis and Calorimetry, 2012
The effect of TeO 2 additions on the thermal behaviour of zinc borophosphate glasses were studied in the compositional series (100x)[0.5ZnO-0.1B 2 O 3 -0.4P 2 O 5 ]-xTeO 2 by differential scanning calorimetry, thermodilatometry and heating microscopy thermal analysis. The addition of TeO 2 to the starting borophosphate glass resulted in a linear increase of glass transition temperature and dilatometric softening temperature, whereas the thermal expansion coefficient decreased. Most of glasses crystallize under heating within the temperature range of 440-640°C. The crystallization temperature steeply decreases with increasing TeO 2 content. The lowest tendency towards crystallization was observed for the glasses containing 50 and 60 mol% TeO 2 . X-ray diffraction analysis showed that major compounds formed by annealing of the glasses were Zn 2 P 2 O 7 , BPO 4 and a-TeO 2 . Annealing of the powdered 50ZnO-10B 2 O 3 -40P 2 O 5 glass leads at first to the formation of an unknown crystalline phase, which is gradually transformed to Zn 2 P 2 O 7 and BPO 4 during subsequent heating.
Structure and properties of Sb2O3-containing zinc borophosphate glasses
Journal of Non-Crystalline Solids, 2007
ZnO-B 2 O 3 -P 2 O 5 glasses formulated with Sb 2 O 3 were investigated in the series 50ZnO-10B 2 O 3 -40P 2 O 5 + xSb 2 O 3 (x = 0-70 mol%). With increasing Sb 2 O 3 content, the values of glass transition temperature decrease from 492°C down to 394°C. The dissolution rate of the glasses reveals a maximum for the glass with x = 15 mol% Sb 2 O 3 . Raman spectra with increasing Sb 2 O 3 content reflect the depolymerisation of phosphate chains. Antimony at low Sb 2 O 3 content forms individual SbO 3 pyramids manifested in the Raman spectra by a broad vibrational band at $520-690 cm À1 . In the glasses with a higher Sb 2 O 3 content SbO 3 units link into chains and clusters with Sb-O-Sb bridges manifested in the Raman spectra by a strong broad band at 380-520 cm À1 . The 31 P MAS NMR spectra with increasing Sb 2 O 3 content reflect the depolymerisation of phosphate chains at low Sb 2 O 3 content and only small changes in the PO 4 coordination at a high Sb 2 O 3 content. 11 B MAS NMR spectra reveal a steady transformation of B(OP) 4 units into B(OP) 4Àx (OSb) x units, accompanied by the transformation of BO 4 into BO 3 units with increasing Sb 2 O 3 content.
2017
The glass forming region has been determined in the ternary system BiPO4-NbOPO4P2O5. Glasses with compositions xBiPO4-(90-x)P2O5-10NbOPO4 (20x35 mol%) and 20BiPO4-(80-x)P2O5-xNbOPO4 (5x30 mol%) were prepared. Their physical, electrical and structural such as density, molar volume, ionic conductivity and FT-IR spectroscopy have been studied in order to understand the structural role of Bi2O3 and Nb2O5 in these glasses. The density of these glasses increases and their molar volume decreases with Bi2O3 and Nb2O5 contents. FT-IR study shows absorption peaks around 1200 cm, 1100 cm, 1000 cm, 900 cm, 780-730 cm, and 520-480 cm corresponding to (PO2)s, (PO3)as, (PO3)s, (P-O-P)as, (P-O-P)s and the bending vibration () of P-O bonds, respectively. The ionic conductivity diminishes substantially with increasing concentration of either Bi2O3 or Nb2O5. The variation in is related to the decrease in O concentration, their mobilty and in the glass network polarization. A correlation betwe...
Synthesis and Characterization of ZnO-Na2O-Bi2O3-B2O3 Glass System
IRJET, 2022
Glasses are characterized by very large possibilities of compositions. There are in fact some hundreds of thousands possible compositions of glasses. The aim of the present study is to prepare quaternary glass systems with the compositions xZnO-(30-x)Na2O-36Bi2O3-34B2O3,(the values of x ranging from 5 to 25 in mol% in steps of 5) by using melt quenching technique. We call the glasses of different compositions obtained with five different names G1, G2, G3, G4, and G5. The glasses are prepared and the obtained glasses appearance and other physical properties are discussed. X-ray diffraction, Fourier Transform Infrared Spectroscope and Scanning Electron Microscope have been used for the Characterization and study of density of glasses prepared.