EPR studies of mixed-conductive glasses in the AgI-Ag2O-V2O5-P2O5 system

被引：30

作者：

Garbarczyk, JE ^{[1
]}

Tykarski, L ^{[1
]}

Machowski, P ^{[1
]}

Wasiucionek, M ^{[1
]}

机构：

[1] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland

来源：

SOLID STATE IONICS | 2001年 / 140卷 / 1-2期

关键词：

AgI-Ag2O-V2O5-P2O5; glasses; mixed conductors; EPR spectroscopy; hyperfine structure;

D O I：

10.1016/S0167-2738(01)00679-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Three families of mixed conductive silver-vanadate-phosphate glasses have been studied by electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra are sensitive to glass modifier (Ag2O) to network former (V2O5-P2O5) ratio r. For r values close to 1, the hyperfine structure (hfs) of the EPR bands is observed. The presence of a hfs is an indicator of the glass network disruption. Therefore, its absence may indirectly point on enhanced electron hopping between aliovalent vanadium centers along V4+-O-V5+ bonds. A method was proposed to extract hfs from apparently unresolved EPR spectra. Using a simulation procedure the parameters of a Hamiltonian responsible for interaction between spins of 3d(1) electron and V-51 nucleus, were determined and a local order around vanadium ions was proposed. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：141 / 148

页数：8

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