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<p>Multicomponent glasses comprising 10Na<sub>2</sub>O-30PbO-10Bi<sub>2</sub>O<sub>3</sub>-(50−<i>x</i>) SiO<sub>2</sub>-<i>x</i>MoO<sub>3</sub> (where <i>x</i> = 0–5&#xa0;mol%) were synthesized using the melt-quenching method. The glass samples were characterized by x-ray diffraction and analyzed by Fourier transform infrared (FTIR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, and optical absorption spectroscopy. Optical absorption studies revealed the proportional conversion of Mo<sup>6+</sup> ions into Mo<sup>5+</sup> local states, which depolymerized the glass network. From EPR spectral analysis, a square pyramid with a Mo=O bond was found to have C<sub>4v</sub> symmetry. The structural units MoO<sub>4</sub> and MoO<sub>6</sub> were present in doped glasses, according to their FTIR spectra. At 200°C, the glass with 5&#xa0;mol% MoO<sub>3</sub> exhibited the highest ionic conductivity (9.45 × 10<sup>−5</sup> S/cm) and lowest activation energy (0.54&#xa0;eV). Sodium lead-bismuth silicate glasses with 5&#xa0;mol% MoO<sub>3</sub> content exhibited semi-conducting behavior, which was supported by all spectroscopic and electrical studies.</p>

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Noncrystalline Sodium Lead-Bismuth Silicate Materials Tuned with Molybdenum Ions for Semiconducting Applications

  • 期刊论文

  • 发表日期：

    2025年2月22日

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  • M. V. Sambasiva Rao,
  • Ch. Tirupataiah,
  • L. Vijayalakshmi,
  • Seong Jin Kwon,
  • Suresh Suragani,
  • Kotcharla Hanumantha Rao,
  • L. Nageswara Rao,
  • M. Naga Lakshmi

摘要

Multicomponent glasses comprising 10Na2O-30PbO-10Bi2O3-(50−x) SiO2-xMoO3 (where x = 0–5 mol%) were synthesized using the melt-quenching method. The glass samples were characterized by x-ray diffraction and analyzed by Fourier transform infrared (FTIR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, and optical absorption spectroscopy. Optical absorption studies revealed the proportional conversion of Mo6+ ions into Mo5+ local states, which depolymerized the glass network. From EPR spectral analysis, a square pyramid with a Mo=O bond was found to have C4v symmetry. The structural units MoO4 and MoO6 were present in doped glasses, according to their FTIR spectra. At 200°C, the glass with 5 mol% MoO3 exhibited the highest ionic conductivity (9.45 × 10−5 S/cm) and lowest activation energy (0.54 eV). Sodium lead-bismuth silicate glasses with 5 mol% MoO3 content exhibited semi-conducting behavior, which was supported by all spectroscopic and electrical studies.