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<p>Glass ceramics with the composition ZnO–P<sub>2</sub>O<sub>5</sub>–SeO<sub>2</sub> doped with varying amounts of silver oxide (Ag<sub>2</sub>O) were synthesized. The effect of Ag<sub>2</sub>O on atomic vacancy formation was studied using positron annihilation lifetime spectroscopy (PALS). XRD and SEM studies confirmed the presence of Ag<sub>3</sub>PO<sub>4</sub>, Ag<sub>2</sub>SeO<sub>3</sub> crystal phases, and Ag<sup>0</sup> nanoparticles in the glassy matrix. Infrared spectroscopy showed that increasing Ag<sub>2</sub>O content enhanced the fraction of Ag<sup>0</sup> nanoparticles in the glass network while decreasing the fraction of ZnO<sub>4</sub> and [SeO<sub>4</sub>]<sup>2−</sup> units. This change indicated an increase in free volume defects, such as voids, that trap positrons. Analysis of positron annihilation lifetime spectra revealed an increase in the longest-lived component (I<sub>3</sub>) and its lifetime (τ<sub>3</sub>) with higher Ag<sub>2</sub>O concentrations, indicating greater void expansion and agglomeration in the glass ceramic. These findings correspond to changes in ac conductivity and suggested that these glass ceramics could be developed as solid electrolytes for solid-state batteries.</p>

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Assessment of free volume using positron annihilation study in Ag2O-doped ZnO-P2O5-SeO2 glass ceramics

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • M. Kostrzewa,
  • G. Naga Koti Reddy,
  • A. Venkata Sekhar,
  • A. Ingram,
  • N. Purnachand,
  • G. Sahaya Baskaran,
  • G. Naga Raju,
  • V. Ravi Kumar,
  • Nalluri Veeraiah

摘要

Glass ceramics with the composition ZnO–P2O5–SeO2 doped with varying amounts of silver oxide (Ag2O) were synthesized. The effect of Ag2O on atomic vacancy formation was studied using positron annihilation lifetime spectroscopy (PALS). XRD and SEM studies confirmed the presence of Ag3PO4, Ag2SeO3 crystal phases, and Ag0 nanoparticles in the glassy matrix. Infrared spectroscopy showed that increasing Ag2O content enhanced the fraction of Ag0 nanoparticles in the glass network while decreasing the fraction of ZnO4 and [SeO4]2− units. This change indicated an increase in free volume defects, such as voids, that trap positrons. Analysis of positron annihilation lifetime spectra revealed an increase in the longest-lived component (I3) and its lifetime (τ3) with higher Ag2O concentrations, indicating greater void expansion and agglomeration in the glass ceramic. These findings correspond to changes in ac conductivity and suggested that these glass ceramics could be developed as solid electrolytes for solid-state batteries.