Role of Te valence on phases crystallized in K2O-Nb2O5-TeO2 glasses

被引：16

作者：

Komatsu, T

Shioya, K

机构：

[1] Department of Chemistry, Nagaoka University of Technology

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1997年 / 209卷 / 03期

关键词：

D O I：

10.1016/S0022-3093(96)00653-9

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Differences in crystalline phases between glass-ceramics and sintered ceramics in the K2O-Nb2O5-TeO2 system have been examined, particularly to obtain information on the role of Te valence on crystallization behaviors of TeO2-based glasses. In glasses or glass-ceramics, the valence of Te4+ is retained even during heat-treatment up to around 600 degrees C, leading to the formation of crystalline phases containing Te4+, e.g., the face-centered cubic crystalline phase. In a powder sintering method, Te4+ is easily oxidized to Te6+ during sintering at around 600 degrees C in air and compounds such as KNbTeO6 in which Te6+ is present are formed.

引用

页码：305 / 308

页数：4

共 10 条

[1] NEW PYROCHLORES OF SYSTEMS MTO3-WO3 AND MTO3-TEO3 (M-K,RB,CS,TL,) (T-NB,TA) [J].