Phase equilibria and crystal chemistry of the CaO-1/2Sm2O3-CoOz system at 885 °C in air

被引：11

作者：

Wong-Ng, W. ^{[1
]}

Laws, W. ^{[2
]}

Lapidus, S. H. ^{[3
]}

Kaduk, J. A. ^{[4
]}

机构：

[1] NIST, Gaithersburg, MD 20899 USA

[2] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA

[3] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[4] IIT, Chicago, IL 60616 USA

来源：

SOLID STATE SCIENCES | 2015年 / 48卷

关键词：

Phase diagram of CaO-1/2Sm(2)O(3)-CoOz; Thermoelectric oxide system; Tie-line phase relationships; Structure for (Sm1-xCax)(2)O3-z; and; (Sm1+xCa1-x)CoO4-z; TEMPERATURE THERMOELECTRIC PROPERTIES; O SYSTEM; CA3CO2O6; OXIDE; DIAGRAM; PR; SR; EU; GD; ND;

D O I：

10.1016/j.solidstatesciences.2015.06.003

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The CaO-1/2Sm(2)O(3)-CoOz system prepared at 885 degrees C in air consists of two calcium cobaltate compounds, namely, the 2D thermoelectric oxide solid solution, (Ca3-xSmx)Co4O9-z (0 <= x <= 0.5) which has a misfit layered structure, and the 1D Ca3Co2O6 which consists of chains of alternating CoO6 trigonal prisms and CoO6 octahedra. Ca3Co2O6 was found to be a point compound without the substitution of Sm on the Ca site. A solid solution region of distorted perovskite, (Sm1-xCax)CoO3-z (0 <= x <= 0.22, space group Pnma) was established. The reported Sm2CoO4 phase was not observed at 885 degrees C, but a ternary Ca-doped oxide, (Sm1+xCa1-x)CoO4-z (Bmab) where 0 < x <= 0.15 was found to be stable at this temperature. In the peripheral binary systems, Sm was not present in the Ca site of CaO, while a small solid solution region was identified for(Sm1-xCax)O(3-z)O(3-z)/2 (0 <= x <= 0.075). Ten solid solution tie-line regions and six three-phase regions were determined in the CaO-1/2Sm(2)O(3)-CoOz system in air. Published by Elsevier Masson SAS.

引用

页码：31 / 38

页数：8

共 38 条

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