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<p>Glasses with the composition (V<sub>2</sub>O<sub>5</sub>)<sub>0.6−<i>x</i></sub>-(PbO)<sub>0.4</sub>-(H<sub>2</sub>WO<sub>4</sub>)<sub><i>x</i></sub> (<i>x</i> = 0.1, 0.15, 0.2, 0.25, 0.3) were synthesized. The density was found to increase from 4.9461&#xa0;gm/cm<sup>3</sup> to 5.9201&#xa0;gm/cm<sup>3</sup> with the increase in <i>x</i>. Mott’s small-polaron hopping (SPH) and variable-range hopping (VRH) models were found to explain high- and low-temperature conductivity, respectively. The highest conductivity and lowest activation energy were observed at <i>x</i> = 0.2. This is because of the mixed transition effect (MTE) occurring in these glasses. MTE in these glasses may be due to the possibility for polaron hopping between the V<sup>4+</sup> and W<sup>6</sup> sites and the W<sup>5+</sup>and W<sup>6+</sup> sites. The γ-shielding properties were estimated over a wide range of energy. Mass attenuation coefficient and linear attenuation coefficient values as high as 85&#xa0;cm<sup>2</sup>/g and 505&#xa0;cm<sup>2</sup>/g at 0.015&#xa0;MeV were found for glass with <i>x</i> = 0.3. The half-value layer, tenth-value layer, and mean free path were found to be smaller than those of the other glasses, whereas the effective atomic number was found to be higher. In summary, the present glasses showed excellent gamma shielding capability compared to many of the reported lead-based glasses, lead-free glasses, and concretes. Thus, the H<sub>2</sub>WO<sub>4</sub>-doped Pb-V<sub>2</sub>O<sub>5</sub> glasses demonstrate an MTE and high potential for γ-shielding.</p> Graphical Abstract <p></p>

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Electrical Conduction Mechanisms and Radiation Shielding Parameters of H2WO4-Doped Lead Vanadate Glasses

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Mohansingh Heerasingh,
  • T. Sankarappa,
  • Amarkumar Malge,
  • Ashwini Devidas,
  • Pallavi Jamadar,
  • B. Raghavendra,
  • Aravind Dyama

摘要

Glasses with the composition (V2O5)0.6−x-(PbO)0.4-(H2WO4)x (x = 0.1, 0.15, 0.2, 0.25, 0.3) were synthesized. The density was found to increase from 4.9461 gm/cm3 to 5.9201 gm/cm3 with the increase in x. Mott’s small-polaron hopping (SPH) and variable-range hopping (VRH) models were found to explain high- and low-temperature conductivity, respectively. The highest conductivity and lowest activation energy were observed at x = 0.2. This is because of the mixed transition effect (MTE) occurring in these glasses. MTE in these glasses may be due to the possibility for polaron hopping between the V4+ and W6 sites and the W5+and W6+ sites. The γ-shielding properties were estimated over a wide range of energy. Mass attenuation coefficient and linear attenuation coefficient values as high as 85 cm2/g and 505 cm2/g at 0.015 MeV were found for glass with x = 0.3. The half-value layer, tenth-value layer, and mean free path were found to be smaller than those of the other glasses, whereas the effective atomic number was found to be higher. In summary, the present glasses showed excellent gamma shielding capability compared to many of the reported lead-based glasses, lead-free glasses, and concretes. Thus, the H2WO4-doped Pb-V2O5 glasses demonstrate an MTE and high potential for γ-shielding.

Graphical Abstract