Thermodynamic assessment of the Mn-Y-O system

被引：28
作者：
Chen, M [1 ]
Hallstedt, B
Gauckler, LJ
机构：
[1] ETH, Dept Mat, CH-8093 Zurich, Switzerland
[2] Rhein Westfal TH Aachen, D-52056 Aachen, Germany
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2005年 / 393卷 / 1-2期
关键词：
yttrium manganite; oxide materials; phase diagrams; thermodynamic properties; thermodynamic modeling;
D O I：
10.1016/j.jallcom.2004.09.057
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The thermodynamic properties of two yttrium manganese complex oxides, h-YMnO3 and YMn2O5, were assessed. They were both treated as stoichiometric compounds. An optimized set of parameters of Gibbs energy functions is proposed. According to our calculation, in air, YMn2O5 is stable from room temperature up to 1461 K. Then it decomposes into h-YMnO3 and beta-Mn3O4. h-YMnO3 is stable above 1062 K. At lower temperature, it decomposes into YMn2O5 and alpha-Y2O3. At 2067 K, it melts incongruently. A complete thermodynamic description of the Mn-Y-O system is proposed. The MnOx-YO1.5 Phase diagram in air and three isothermal sections of the Mn-Y-O system are presented. (c) 2004 Elsevier B.V. All rights reserved.
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页码：114 / 121
页数：8
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