A relationship between electrical conductivity and structural relaxation of 10SnO2·10Fe2O3·10P2O5·xAgI·(70 - x)V2O5 glass caused by heat-treatment

Koken Matsuda, Shiro Kubuki, Kazuhiko Akiyama, Zoltán Homonnay, Katalin Sinkó, Erno Kuzmann, Tetsuaki Nishida

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2 Citations (Scopus)

Abstract

A relationship between local structure, electrical conductivity (·) and thermal property of 10SnO2·10P2O5·10Fe2O3·xAgI· (70 - x)V2O5, 10SnO2·10P2O5·10Fe2O3·xAg2O·(70 - x)V2O5 and 10SnO2·10P2O5·10Fe2O3·x/2(AgI·Ag2O)·(70 - x)V2O5 glasses, respectively abbreviated as xAIVSPF, xAOVSPF and xAIAOVSPF with 'x' between 0 and 40 mol% were investigated by 57Feand 119Sn-Mössbauer spectroscopies, X-ray diffractometry (XRD), Scanning Electron Microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA) and DC two- And four-probe methods. Heat-treatment at 500°C for 100 min of xAIVSPF glass with 'x' of 10, 20, 30 and 40 resulted in a marked increase in · from 2.2 × 10-5, 9.4 × 10-6, 3.2 × 10-6and 2.6 ×10-6Scm-1to 2.6 × 10-1, 2.1 × 10-1, 5.2 × 10-2and 1.3 × 10-2Scm-1, respectively. Similar increase in · caused by heat-treatment was also observed for xAOVSPF and xAIAOVSPF glasses with 'x' being equal to or less than 20 mol%. From DTA study, glass transition temperature (Tg) of 248298° C and crystallization temperature (Tc) of 362379° C were observed for xAIVSPF glass, whereas gradual decreases in Tg from 2775 to 2165°C and Tc from 3562 to 2832°C were confirmed for xAOVSPF glass, implying that substitution of AgI for V2O5 didn't affect the 3D glass network but that of Ag2O causes the cleavage of the 3D glass network. FT-IR study of the heat treated xAOVSPF glass showed the dissappearance of bridging oxygen of POP and VOV with the Ag2O content, indicating that cleavage of the 3D glass network caused the decrease of the electrical conductivity. It can be concluded that AgI-subsutituted iron tin phosphovanadate glass is better than Ag2O-subsutituted iron tin phosphovanadate glass for achiving the higher electrical conductivity.

Original languageEnglish
Pages (from-to)121-128
Number of pages8
JournalJournal of the Ceramic Society of Japan
Volume123
Issue number1435
DOIs
Publication statusPublished - Jan 1 2015

Keywords

  • Electron hopping
  • Heat treatment
  • Mössbauer spectroscopy
  • Silver vanadate glass
  • Structural relaxation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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