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<p>Vanadium-doped lithium telluro-phosphate glasses of composition <i>x</i>V<sub>2</sub>O<sub>5</sub>-(0.3−<i>x</i>) Li<sub>2</sub>O-0.35TeO<sub>2</sub>-0.35P<sub>2</sub>O<sub>5</sub> (<i>x</i> = 0.05, 0.10, 0.15, and 0.20) were prepared by a conventional melt-quenching process. X-ray diffraction analysis of the structure revealed that the produced glasses were amorphous. When V<sub>2</sub>O<sub>5</sub> was added, the glass samples’ density increased (3.42–3.81&#xa0;g/cm<sup>3</sup>), and their molar volume decreased, indicating that the glass network was compact. The ultraviolet–visible (UV–Vis) spectrometer’s optical transmission data were used to study the optical characteristics of the as-prepared samples. The vanadium concentration had a significant impact on the calculation of several optical parameters from the transmission data, including the indirect optical bandgap (dropped from 3.18 &#xa0;eV to 2.29&#xa0;eV), molar refractivity (increased from 26.77 cm<sup>3</sup> mol<sup>−1</sup> to 30.51 cm<sup>3</sup> mol<sup>−1</sup>), and linear refractive index (increased from 2.34 to 2.62). Measurements of direct-current (DC) and alternating-current (AC) conductivity glass systems were carried out at temperatures ranging from 413&#xa0;K to 553&#xa0;K. DC conductivity exhibited a significant enhancement, reaching its maximum value of 1.24 × 10<sup>−4</sup> S/cm at <i>x</i> = 0.20 (553&#xa0;K), attributed to polaron hopping between V<sup>4+</sup>/V<sup>5+</sup> states. AC conductivity followed Jonscher’s power law, with frequency exponent <i>n</i> decreasing from 0.82 to 0.65, suggesting correlated barrier hopping (CBH) dominance. Several elastic moduli were determined, including bulk modulus (decreased from 36.82 GPa to 28.62 GPa), longitudinal modulus (decreased from 69.04 GPa to 53.65 GPa), shear modulus (decreased from 24.23 GPa to 19.03 GPa), and Young’s modulus (decreased from 59.55 GPa to 46.50 GPa). The obtained findings indicated the potential of this mechanically tunable material to be used in opto-electronic devices in high-temperature applications.</p>

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Comprehensive Characterization of xV2O5-(0.3−x)Li2O-0.35TeO2-0.35P2O5 Glasses: Influence of V2O5 Concentration on Electrical, Optical and Mechanical Properties

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Ashes Rakshit,
  • Rittwick Mondal,
  • Swagata Nandy,
  • Rohit Kumar Singh Gautam,
  • Souvik Brahma Hota,
  • Arpan Mandal,
  • Debasish Roy,
  • Dipankar Biswas

摘要

Vanadium-doped lithium telluro-phosphate glasses of composition xV2O5-(0.3−x) Li2O-0.35TeO2-0.35P2O5 (x = 0.05, 0.10, 0.15, and 0.20) were prepared by a conventional melt-quenching process. X-ray diffraction analysis of the structure revealed that the produced glasses were amorphous. When V2O5 was added, the glass samples’ density increased (3.42–3.81 g/cm3), and their molar volume decreased, indicating that the glass network was compact. The ultraviolet–visible (UV–Vis) spectrometer’s optical transmission data were used to study the optical characteristics of the as-prepared samples. The vanadium concentration had a significant impact on the calculation of several optical parameters from the transmission data, including the indirect optical bandgap (dropped from 3.18  eV to 2.29 eV), molar refractivity (increased from 26.77 cm3 mol−1 to 30.51 cm3 mol−1), and linear refractive index (increased from 2.34 to 2.62). Measurements of direct-current (DC) and alternating-current (AC) conductivity glass systems were carried out at temperatures ranging from 413 K to 553 K. DC conductivity exhibited a significant enhancement, reaching its maximum value of 1.24 × 10−4 S/cm at x = 0.20 (553 K), attributed to polaron hopping between V4+/V5+ states. AC conductivity followed Jonscher’s power law, with frequency exponent n decreasing from 0.82 to 0.65, suggesting correlated barrier hopping (CBH) dominance. Several elastic moduli were determined, including bulk modulus (decreased from 36.82 GPa to 28.62 GPa), longitudinal modulus (decreased from 69.04 GPa to 53.65 GPa), shear modulus (decreased from 24.23 GPa to 19.03 GPa), and Young’s modulus (decreased from 59.55 GPa to 46.50 GPa). The obtained findings indicated the potential of this mechanically tunable material to be used in opto-electronic devices in high-temperature applications.