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<p>The multi-functional glasses 65B<sub>2</sub>O<sub>3</sub>-20Bi<sub>2</sub>O<sub>3</sub>-10Al<sub>2</sub>O<sub>3</sub>-(5-x)MgO: xCr<sub>2</sub>O<sub>3</sub> (0 ≤ x ≤ 0.5&#xa0;mol%) were prepared by conventional melt quenching and heat treatment process. The samples were explored by examining X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman spectra, electron spin resonance spectra (ESR), emission spectra, optical absorption, and dielectric studies. The physical, optical, and dielectric properties of samples were investigated. The highest concentration of chromium ions is 9.845 X 10<sup>21</sup> ions/cm<sup>3</sup> for the glass doped with 0.5&#xa0;mol% of Cr<sub>2</sub>O<sub>3</sub>. The studies on FTIR and Raman spectra reveal the structural changes in glasses by exhibiting an in increase in intensity of the bands due to BO<sub>3</sub> units. ESR spectra of doped glasses displayed an intense resonance signal at <i>g</i> = 4.20 due to Cr<sup>3+</sup> ions. The emission spectra of glasses exhibited a sharp peak centered at 740&#xa0;nm due to <sup>4</sup>T<sub>2g</sub> → <sup>4</sup>A<sub>2g</sub> transitions of Cr<sup>3+</sup> ions. The optical absorption spectra of glasses displayed an intense absorption band centered at 615&#xa0;nm. The least values of direct and indirect optical bandgap of glasses are 2.687 and 2.364&#xa0;eV, respectively. Dielectric properties were investigated on a temperature scale of 30–300&#xa0;°C by varying frequencies in the range of 10<sup>3</sup>–10<sup>6</sup>&#xa0;Hz to ascertain the suitability of glasses for various electronic and laboratory applications. The estimated maximum a.c. conductivity for a glass doped with 0.5&#xa0;mol% of Cr<sub>2</sub>O<sub>3</sub> is 5.86 X 10<sup>–6</sup> (Ω-cm)<sup>−1</sup>. The glass doped with 0.5&#xa0;mol% of Cr<sub>2</sub>O<sub>3</sub> was perceived as the suitable material for diverse optical and dielectric applications.</p>

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Cogency of chromium ions in strengthening spectroscopic and dielectric properties of B2O3-Bi2O3-Al2O3-MgO glass materials

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • G. Krishna Priya,
  • S. Yusub,
  • A. Ramesh Babu,
  • N. Sreeram,
  • B. S. Ananda Kumar,
  • Ravindranadh Koutavarapu,
  • V. Aruna

摘要

The multi-functional glasses 65B2O3-20Bi2O3-10Al2O3-(5-x)MgO: xCr2O3 (0 ≤ x ≤ 0.5 mol%) were prepared by conventional melt quenching and heat treatment process. The samples were explored by examining X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman spectra, electron spin resonance spectra (ESR), emission spectra, optical absorption, and dielectric studies. The physical, optical, and dielectric properties of samples were investigated. The highest concentration of chromium ions is 9.845 X 1021 ions/cm3 for the glass doped with 0.5 mol% of Cr2O3. The studies on FTIR and Raman spectra reveal the structural changes in glasses by exhibiting an in increase in intensity of the bands due to BO3 units. ESR spectra of doped glasses displayed an intense resonance signal at g = 4.20 due to Cr3+ ions. The emission spectra of glasses exhibited a sharp peak centered at 740 nm due to 4T2g → 4A2g transitions of Cr3+ ions. The optical absorption spectra of glasses displayed an intense absorption band centered at 615 nm. The least values of direct and indirect optical bandgap of glasses are 2.687 and 2.364 eV, respectively. Dielectric properties were investigated on a temperature scale of 30–300 °C by varying frequencies in the range of 103–106 Hz to ascertain the suitability of glasses for various electronic and laboratory applications. The estimated maximum a.c. conductivity for a glass doped with 0.5 mol% of Cr2O3 is 5.86 X 10–6 (Ω-cm)−1. The glass doped with 0.5 mol% of Cr2O3 was perceived as the suitable material for diverse optical and dielectric applications.