Phase relations, lattice thermal expansion in CeO2-Gd2O3 system, and stabilization of cubic gadolinia
Phase relations, lattice thermal expansion in CeO2-Gd2O3 system, and stabilization of cubic gadolinia
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DOI：
10.1016/j.materresbull.2004.01.007
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发表时间：
2004-05-05
影响因子：
5.4
通讯作者：
Tyagi, AK
中科院分区：
文献类型：
--
作者：
Grover, V;Tyagi, AK
CeO2-Gd2O3体系中的相关系是在1400℃缓慢冷却的条件下建立的。在该体系中观察到两个相区，即F型立方和C型立方。这项研究的一个引人注目的观察结果是 Ce4+ 取代后 C 型钆的稳定性，这是由于 Ce4+ 取代 Gd3+ 位点时平均阳离子尺寸的减小。采用高温 XRD 研究了 C 型氧化钆样品的晶格热膨胀行为。在Ce1-xGdxO2-x/2系列中，在C型均匀范围内，发现随着Ce4+含量的增加，晶格热膨胀系数逐渐增加。 (C) 2004 Elsevier Ltd. 保留所有权利。
The phase relation in CeO2-Gd2O3 system has been established under slow cooled conditions from 1400 degreesC. Two phase regions, namely F-type cubic and C-type cubic, were observed in this system. A striking observation of this investigation is the stabilization of C-type gadolinia after Ce4+ substitution, which is attributed to decrease in average cationic size on Ce4+ substitution at Gd3+ site. The lattice thermal expansion behaviour of C-type gadolinia samples was investigated by High temperature-XRD. The lattice thermal expansion coefficient was found to gradually increase on increasing the Ce4+ content, within the C-type homogeneity range, in Ce1-xGdxO2-x/2 series. (C) 2004 Elsevier Ltd. All rights reserved.