Dense ceramics of NaNbO3 produced from powders prepared by a new chemical route

被引:85
作者
Lanfredi, S
Dessemond, L
Rodrigues, ACM
机构
[1] ENSEEG, Lab Electrochim & Physicochim Mat & Interfaces, UMR 5631, INPG,CNRS,Inst Natl Polytech Grenoble, F-38402 St Martin Dheres, France
[2] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
关键词
calcination; NaNbO3; niobates; powders-chemical preparation; sintering;
D O I
10.1016/S0955-2219(99)00223-X
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
A sodium niobate precursor was prepared by evaporating a solution of an oxalato-niobium complex, sodium nitrate, oxalic acid and ammonium hydroxide. The thermal evolution of the precursor powder, to the point of formation of the NaNbO3 phase, was followed by thermal analysis and powder X-ray diffraction. Calcination of the precursor above 500 degrees C for 5 h in air yielded a pure single phase NaNbO3, The non-isothermal densification behaviour was followed by dilatometric measurements. Highly sinterable powders were prepared by this new chemical route. Densities higher than 95% of the theoretical one were reached after sintering at 1250 degrees C for 2 h in air. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:983 / 990
页数:8
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