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<p>Tellurium oxide modified vanadium zinc phosphate glasses with composition xTeO<sub>2</sub>-(0.35-x)V<sub>2</sub>O<sub>5</sub>-0.25ZnO-0.40P<sub>2</sub>O<sub>5</sub> (x = 0.10–0.25) have been prepared by conventional melt quenching methods to understand the multi-functional roles of TeO<sub>2</sub> as the network modifier. The amorphous nature of the prepared samples has been confirmed from X-ray diffraction analysis. The deliberate doping of TeO<sub>2</sub> into such network formers brought about an increase in density along with a corresponding decrease in molar volume, oxygen packing density, and polaron radius, thereby establishing an increase in networks. Ultrasonic velocity measurements reveal a systematic increase in both longitudinal and shear wave velocities with increasing tellurium dioxide content, leading to higher values of longitudinal modulus, shear modulus, bulk modulus, and Young’s modulus, while the Poisson’s ratio decreases. These experimental results have been intimately supported by theoretical calculations based upon Bond Compression Models, in which elastic stiffening is virtually considered to be due to the increase in bond concentration per unit volume rather than change in bond-force constants. Optical studies reveal a systematic red shift in the absorption edge, a decrease in the optical bandgap energy, and a rise in the Urbach energy due to TeO₂ addition, suggesting increased electronic disorders and the onset of tail states. At the same time, the refractive index rises over the entire measured wavelength range in accordance with a regular dispersion pattern in the visible region, closely associated with the rise in sample compactness, elastic constants, Te-O bond covalency, and sample polarizability. From the dielectric spectra, a heightened real part of the dielectric constant with small imaginary values in the visible region has been observed; in addition, the volume and surface energy loss functions remain minimal in value, accentuating the transparency in the optical regime and the low dielectric dissipation loss in the samples, thereby confirming the superior dielectric performance of the TVZP samples.</p>

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Influence of TeO2 doping on V2O5-ZnO-P2O5 glass matrix: An investigation on elastic moduli and optical properties

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Rajendra Kumar Agrahari,
  • Dipankar Biswas,
  • Ranjeet Rai,
  • Vivek Kumar

摘要

Tellurium oxide modified vanadium zinc phosphate glasses with composition xTeO2-(0.35-x)V2O5-0.25ZnO-0.40P2O5 (x = 0.10–0.25) have been prepared by conventional melt quenching methods to understand the multi-functional roles of TeO2 as the network modifier. The amorphous nature of the prepared samples has been confirmed from X-ray diffraction analysis. The deliberate doping of TeO2 into such network formers brought about an increase in density along with a corresponding decrease in molar volume, oxygen packing density, and polaron radius, thereby establishing an increase in networks. Ultrasonic velocity measurements reveal a systematic increase in both longitudinal and shear wave velocities with increasing tellurium dioxide content, leading to higher values of longitudinal modulus, shear modulus, bulk modulus, and Young’s modulus, while the Poisson’s ratio decreases. These experimental results have been intimately supported by theoretical calculations based upon Bond Compression Models, in which elastic stiffening is virtually considered to be due to the increase in bond concentration per unit volume rather than change in bond-force constants. Optical studies reveal a systematic red shift in the absorption edge, a decrease in the optical bandgap energy, and a rise in the Urbach energy due to TeO₂ addition, suggesting increased electronic disorders and the onset of tail states. At the same time, the refractive index rises over the entire measured wavelength range in accordance with a regular dispersion pattern in the visible region, closely associated with the rise in sample compactness, elastic constants, Te-O bond covalency, and sample polarizability. From the dielectric spectra, a heightened real part of the dielectric constant with small imaginary values in the visible region has been observed; in addition, the volume and surface energy loss functions remain minimal in value, accentuating the transparency in the optical regime and the low dielectric dissipation loss in the samples, thereby confirming the superior dielectric performance of the TVZP samples.