Dc conductivity of V2O5 MnO TeO2 glasses

被引：92

作者：

Sega, K ^{[1
]}

Kuroda, Y ^{[1
]}

Sakata, H ^{[1
]}

机构：

[1] Tokai Univ, Dept Appl Chem, Kanagawa 25912, Japan

来源：

JOURNAL OF MATERIALS SCIENCE | 1998年 / 33卷 / 05期

关键词：

D O I：

10.1023/A:1004302431797

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Semiconductive oxide glasses in the system V2O5-MnO-TeO2 were prepared, and the mechanism of d.c. conduction was studied. The Seebeck coefficient measurements at temperatures from 375-475 K indicated the glasses to be n-type semiconducting. The d.c. conductivity ranged from 5x10(-5) to 1.9x10(-6) S cm(-1) at 405 K for V2O5=60 mol% and MnO=0-20 mol%, and decreased with increasing MnO content. The conduction was confirmed to obey the adiabatic small polaron hopping model, and was due to mainly hopping between V-ions in the glasses. The polaron band width J was estimated to be J=0.10-0.20 eV. The electron-phonon interaction coefficient gamma(p) was very large (21-26). The hopping mobility evaluated as 2.3x10(-7)-2.7x10(-6) cm(2) V-1 s(-1) increased with increasing V2O5 content. The estimated carrier concentration was the order of 10(19) cm(-3). The principal factor determining conductivity was the polaron hopping mobility in these glasses. (C) 1998 Chapman & Hall.

引用

页码：1303 / 1308

页数：6