Studies on phase transitions of rare earth tantalates (Sm1-xLnx)3TaO7 (Ln = Nd, Eu) with fluorite-related structure

被引：5
|
作者：
Hinatsu, Yukio [1 ]
Doi, Yoshihiro [1 ]
机构：
[1] Hokkaido Univ, Grad Sch Sci, Div Chem, Sapporo, Hokkaido 0600810, Japan
来源：
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 2019年 / 127卷 / 05期
关键词：
Phase transition; Samarium; Tantalum; Oxides; Fluorite-related structure; DTA; OXIDES LN(3)REO(7) LN; MAGNETIC-PROPERTIES; THERMAL-PROPERTIES; CRYSTAL-STRUCTURES; NEUTRON-DIFFRACTION; LN(3)SBO(7) LN; SM; GD; R3TAO7; PR;
D O I：
10.2109/jcersj2.18219
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：
The phase transition of Sm3TaO7 with orthorhombic fluorite-related structure was investigated. Solid solutions (Sm1-xNdx)(3)TaO7 and (Sm1-xEux)(3)TaO7 were prepared, and their structures at room temperature are well described with the space group C222(1). The phase transition temperature for (Sm1-xNdx)(3)TaO7 decreases from 1340 K with increasing Nd concentration, while that for (Sm1-xEux)(3)TaO7 increases with Eu concentration. However, both of these solid solutions show the same trend, i.e., with decreasing average rare earth radii, the phase transition temperature of (Sm(1-x)Ln(x))(3)TaO7 (Ln = Nd, Eu) increases. This trend is the same as that observed for Ln(3)MO(7) (M = Mo, Ru, Re, Os, or Ir). That is, the phase transition occurs with lattice contraction. Above the transition temperature, crystal structures for (Sm(1-x)Ln(x))(3)TaO7 (Ln = Nd, Eu) are well described with space group Pnma. (C) 2019 The Ceramic Society of Japan. All rights reserved.
引用
收藏
页码：273 / 278
页数：6
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