Structure, microstructure and magnetic properties of Sr1-xCaxCrO3 (0 ≤ x ≤ 1)

被引：37

作者：

Castillo-Martinez, E. ^{[1
]}

Duran, A. ^{[1
,2
]}

Alario-Franco, M. A. ^{[1
]}

机构：

[1] Univ Complutense Madrid, Dept Quim Inorgan, Lab Complutense Altas Pres, Fac Quim, E-28040 Madrid, Spain

[2] Univ Nacl Autonoma Mexico, Ctr Ciencias Materia Condensada, Ensenada 22800, Baja California, Mexico

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2008年 / 181卷 / 04期

关键词：

perovskite; Cr(IV); solid solutions; structure; microstructure; electron diffraction; HRTEM; high pressure;

D O I：

10.1016/j.jssc.2008.01.022

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The effect of the calcium concentration on the structural, microstructural and magnetic properties of Sr(1-x)CaxCrO3 with 0 <= x <= 1 has been studied. The compounds were prepared using high pressure and high temperature synthesis. X-ray diffraction shows that the samples evolve from the cubic Pm-3m space group for x = 0-0.2 to tetragonal I4/mcm for x = 0.4-0.5, then to the orthorhombic Pbnm space group for x = 0.6, 0.8 and 1.0. Electron diffraction and high-resolution transmission electron microscopy confirmed the respective cells for the end compositions: a(p) x a(p) x a(p) (Pm-3m) for SrCrO3; and the root 2a(p) x root 2a(p) x 2a(p) (Pbnm) for CaCrO3. For intermediate compositions some extra spots appear in the electron diffraction patterns while the electron micrographs indicate the presence of microdomains. Magnetic measurements show Curie-Weiss behaviour at high temperature for all the samples. A sharp antiferromagnetic (AFM) transition at about 91.5 K appears for x = 0.8-1 together with a weak ferromagnetic ordering below T-N. (c) 2008 Elsevier Inc. All rights reserved.

引用

页码：895 / 904

页数：10

共 27 条

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