Effect of cerium(IV) oxide on the optical and dielectric properties of strontium bismuth borate glasses (original) (raw)
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Optical Properties of Bismuth Borate Glasses Doped with Zinc and Calcium Oxides
Journal of Materials and Applications
Some bismuth-borate oxide glass' samples were prepared by the fast quenching method, where B2O3 was replaced with equal concentrations of ZnO and CaO. X-ray diffraction (XRD) was used to examine the internal structure and Fourier transform infrared (FTIR) to identify building units and bonds throughout the studied structural matrices. XRD showed that all samples have short range order structural nature, while FTIR demonstrated some of Zn2+ acted as glass network formers and all Bi3+ acted as glass. UV-visible measurements and calculations showed a decreasing in the energy band gap from 3.83 eV to 1.73 eV with decreasing B2O3 content. Also with decreasing B2O3 content, both real refractive index and metallization factor decreased from 3.1 to 1.9 and from 0.56 to 0.71, respectively. For the studied glass' samples, density and molar volume showed inverted behaviors, where the density decreased while the molar volume increases with decreasing B2O3.
Glasses with composition x Bi 2 O 3 ·(30 2 x)M 2 O·70B 2 O 3 (M ¼ Li, Na) containing 2 mol% V 2 O 5 have been prepared over the range 0 # x # 15 (x is in mol%). The electron paramagnetic resonance spectra of VO 2þ of these glasses have been recorded in the X-band (<9.3 GHz) at room temperature (RT < 300 K). Spin Hamiltonian parameters, g k ; g ' ; A k ; A ' ; dipolar hyperfine coupling parameter, P; and Fermi contact interaction parameter, K; have been calculated. The molecular orbital coefficients, a 2 and g 2 ; have been calculated by recording the optical transmission spectra. In x Bi 2 O 3 ·(30 2 x)Li 2 O·70B 2 O 3 glasses there is decrease in the tetragonality of the V 4þ O 6 complex for x up to 6 mol% whereas for x $ 6 mol%, tetragonality increases. In x Bi 2 O 3 ·(30 2 x)Na 2 O·70B 2 O 3 glasses there is increase in the tetragonality of the V 4þ O 6 complex with increasing x: The 3d xy orbit expands with increase in Bi 2 O 3 :M 2 O ratio. Values of the theoretical optical basicity, L th ; have also been reported. The DC conductivity increases with increase in temperature. The order of conductivity is 10 25 ohm 21 m 21 at low temperature and 10 23 ohm 21 m 21 at high temperature. The DC conductivity decreases and the activation energy increases with increase in Bi 2 O 3 :M 2 O ratio. q
Glasses with composition x Bi 2 O 3 ·(30 2 x)M 2 O·70B 2 O 3 (M ¼ Li, Na) containing 2 mol% V 2 O 5 have been prepared over the range 0 # x # 15 (x is in mol%). The electron paramagnetic resonance spectra of VO 2þ of these glasses have been recorded in the X-band (<9.3 GHz) at room temperature (RT < 300 K). Spin Hamiltonian parameters, g k ; g ' ; A k ; A ' ; dipolar hyperfine coupling parameter, P; and Fermi contact interaction parameter, K; have been calculated. The molecular orbital coefficients, a 2 and g 2 ; have been calculated by recording the optical transmission spectra. In x Bi 2 O 3 ·(30 2 x)Li 2 O·70B 2 O 3 glasses there is decrease in the tetragonality of the V 4þ O 6 complex for x up to 6 mol% whereas for x $ 6 mol%, tetragonality increases. In x Bi 2 O 3 ·(30 2 x)Na 2 O·70B 2 O 3 glasses there is increase in the tetragonality of the V 4þ O 6 complex with increasing x: The 3d xy orbit expands with increase in Bi 2 O 3 :M 2 O ratio. Values of the theoretical optical basicity, L th ; have also been reported. The DC conductivity increases with increase in temperature. The order of conductivity is 10 25 ohm 21 m 21 at low temperature and 10 23 ohm 21 m 21 at high temperature. The DC conductivity decreases and the activation energy increases with increase in Bi 2 O 3 :M 2 O ratio. q
Structural and Optical Properties of Copper doped Lanthanum Strontium Borate Glasses
The glass composition of 10La 2 O 3-30SrO-60B 2 O 3-xCuO, where x = 0, 0.1, 0.2, 0.5 and 1 (in mole %) has been synthesized by the conventional melt quench technique. The powder X-Ray diffraction analysis of the prepared samples confirms the amorphous nature of the samples. Density measurements for these glasses were done and physical parameters were studied. Structural properties of these glasses were analyzed through infrared spectra that were recorded between 1600cm-1 and 400cm-1 in transmission mode. The optical band gap for the glasses was obtained from plots between ℎí µí¼ against (í µí»¼ℎí µí¼) 2 and(í µí»¼ℎí µí¼) 1 2. The value of Band gap were found to be around 2.8 to 3eV, by extrapolating the straight line tangent to the energy axis the optical band gap for these glasses were measured. IR reveals the existence of various borate segments, above 500cm-1 .
Journal of Physics and Chemistry of Solids, 2003
Glasses with composition x Bi 2 O 3 ·(30 2 x)M 2 O·70B 2 O 3 (M ¼ Li, Na) containing 2 mol% V 2 O 5 have been prepared over the range 0 # x # 15 (x is in mol%). The electron paramagnetic resonance spectra of VO 2þ of these glasses have been recorded in the X-band (<9.3 GHz) at room temperature (RT < 300 K). Spin Hamiltonian parameters, g k ; g ' ; A k ; A ' ; dipolar hyperfine coupling parameter, P; and Fermi contact interaction parameter, K; have been calculated. The molecular orbital coefficients, a 2 and g 2 ; have been calculated by recording the optical transmission spectra. In x Bi 2 O 3 ·(30 2 x)Li 2 O·70B 2 O 3 glasses there is decrease in the tetragonality of the V 4þ O 6 complex for x up to 6 mol% whereas for x $ 6 mol%, tetragonality increases. In x Bi 2 O 3 ·(30 2 x)Na 2 O·70B 2 O 3 glasses there is increase in the tetragonality of the V 4þ O 6 complex with increasing x: The 3d xy orbit expands with increase in Bi 2 O 3 :M 2 O ratio. Values of the theoretical optical basicity, L th ; have also been reported. The DC conductivity increases with increase in temperature. The order of conductivity is 10 25 ohm 21 m 21 at low temperature and 10 23 ohm 21 m 21 at high temperature. The DC conductivity decreases and the activation energy increases with increase in Bi 2 O 3 :M 2 O ratio. q
Electrical Properties of Lithium and Sodium Borate Glasses Doped with Chromium Oxide
Background: In this work, we experimentally studied the ac-electric conductivity and dielectric constant of some lithium and sodium borate glasses doped with chromium oxide. These glass materials are of interest for science and technology. Materials and Methods: We introduced Chromium oxide with Low concentration of 0.1 and 0.7 mol. % to Lithium and Sodium borate glasses with chemical composition 37 mol % [M 2 O]-63 mol % [B 2 O 3 ] where (M=Li and Na)]).We successfully prepared the glass samples by melting quenching method. The X-ray diffraction pattern was carried out using Bruker AXS X-Ray analytical diffraction system. The ac-electrical conductivity, and dielectric constant measured at atmospheric pressure as a function of temperature (in the range from room temperature up to 500 0 K) and frequency in the range from 0.1 kHz up to 200 kHz). Results: The X-ray patterns showed the amorphous nature of these glasses. The curve features of the ac-conductivity showed deviations from the Arrhenius linear relation observed at T < 400 K. We estimated the crystalline activation energies for all samples under consideration. The measurements verified the scaling law of the ac-conductivity as a function of the applied frequency. Conclusion: From the results, we have the following: a) From the recorded XRD Spectra we observed evidence of the formation of pre-crystalline phase; b) The electrical properties of these glasses are affected by the different physical and chemical processes; c) Values of the ac-conduction mechanism are predominantly ionic in the undoped samples containing Li or Na ions. The mobility of these ions is affected by the presence of Cr ions in all doped samples; d) The increase of the ionic mobility is responsible for the behaviour of the dielectric loss of these glass samples.
Effect of cerium oxide addition on electrical and physical properties of alkali borosilicate glasses
Elesevier, 2010
The study of electrical conductivity, density and coefficient of thermal expansion (CTE) of Na 2 O:K 2 O:B 2 O 3 :SiO 2 :BaO glass samples with addition of cerium oxide has been carried out. It has been observed that the addition of cerium oxide affects the electrical conductivity, density and CTE. The results have been explained on the basis of the variation in number of bridging oxygens (BOs) and non-bridging oxygens (NBOs) present in the glass. In general, the glass with more NBOs has a weak network which exhibits higher electrical conductivity. The weakening of the network has been supported by the observed decrease in density and increase in CTE for the glasses.
A Review on Infrared Spectroscopy of Borate Glasses with Effects of Different Additives
Borate glasses are the technologically important class of glasses and play a significant role in various applications. Borate glasses contain planar BO 3 groups as structural units, rather than tetrahedral SiO 4 groups. The oxygen atoms are, as in SiO 2 , again connected to two network-forming atoms, in case of boron. The radial distribution analysis describes the B 2 O 3 glass structure as consisting of boroxol rings, that is, planar rings containing three boron atoms and three oxygen atoms. The network forming of the B 2 O 3 and the SiO 4 is affected with the addition of some metal cation additives Pb, Zn, Cd, and so forth. These additives also work as a network modifier and a nucleating agent for crystallization of glass. Therefore, the optical properties of the borate glasses have been changed significantly.
Journal of Materials Science: Materials in Electronics, 2020
The optical, dielectric response, and ac-conductivity properties for six glasses of zinc lead-borate doped with different contents of Fe 3? (Fe 2 O 3 = 0 to 10 wt%) have been investigated. UV-Vis spectra in 190-1100 nm wavelength have been carried out. Band gaps for optical energy (E Optical), Urbach's energy (E U), index of refraction (n), steepness parameter (S), energy dispersion parameter of refractive index (E d), single-oscillator energy (E o), the dispersion refractive index (n o), minimum reflectance wavelength (k o), and oscillator strength (S o) were evaluated. Results reveal that the indirect energy gap varies from 2.57 to 1.01 eV, while the direct energy gap takes values from 2.80 to 1.45 eV. The E U values change from 0.232 to 0.966 eV for glasses with Fe 2 O 3 = 0 and 10 wt%, respectively. Also, S and k o decrease with the enhancement of Fe 2 O 3 content. The dielectric response and ac-conductivity of the prepared glasses were investigated by broadband dielectric spectroscopy, BDS, in the frequency range from 0.1 Hz to 10 MHz and at temperatures ranging between 300 and 430 K. Two trends of activation plot have been observed in the conductivity of the samples with low content of Fe 2 O 3. Although these samples show a perfect insulation features, they obey an anomalous behavior at higher temperatures. Therefore, the investigated glasses can be applied in several optical and optoelectronic devices.