Phase formation and thermal stability of fcc (fluorite) Ce1-xTbxO2-δ solid solutions

被引：9
|
作者：
de Vries, KJ
Meng, GY
机构：
[1] Univ Twente, Fac Chem Technol, Lab Inorgan Mat Sci, NL-7500 AE Enschede, Netherlands
[2] Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
来源：
MATERIALS RESEARCH BULLETIN | 1998年 / 33卷 / 03期
关键词：
ceramics; differential scanning calorimetry; thermogravimetric analysis; X-ray diffraction; phase equilibria;
D O I：
10.1016/S0025-5408(97)00237-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ce1-xTbxO2-delta solid solutions (x = 0.3, 0.4, and 0.5) were synthesized by a coprecipitation method, using ammonia. The formation process of the solid solutions was studied as a function of temperature up to 1200 degrees C by X-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry. The results showed that chemically homogeneous, oxidic fee structures were formed. The large increase (similar to 1.5%) of the fee unit-cell parameter on increase of temperature in ambients of oxygen or nitrogen could be correlated with changes in the oxygen stoichiometry (approximate to 3.5%) that have led to a reversible change in the valence state from (TV) to (III) of a fraction of the Ce and Tb ions. The fee structure was chemically and structurally stable to at least 1200 degrees C. (C) 1998 Elsevier Science Ltd.
引用
收藏
页码：357 / 367
页数：11
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