Crystal and magnetic structures of the brownmillerite Ca2Cr2O5

被引：12

作者：

Arevalo-Lopez, Angel M.

Attfield, J. Paul ^{[1
]}

机构：

[1] Univ Edinburgh, Ctr Sci Extreme Condit, Edinburgh EH9 3FD, Midlothian, Scotland

来源：

DALTON TRANSACTIONS | 2015年 / 44卷 / 23期

基金：

英国工程与自然科学研究理事会;

关键词：

HARD-SOFT SYNTHESIS; DIFFRACTION; PEROVSKITES; VACANCY; SERIES;

D O I：

10.1039/c4dt03780d

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Powder neutron diffraction and magnetic susceptibility measurements at 10-300 K have been used to determine the crystal and magnetic structures of brownmillerite type Ca2Cr2O5, which was obtained by reduction of the high pressure phase CaCrO3 through hard-soft chemistry. The ambient temperature crystal structure of Ca2Cr2O5 is refined in space group I2mb and the unusual tetrahedral coordination of Cr3+ results in local structural distortions. Cr3+ spins order antiferromagnetically below 220 K and a substantial observed canting of moments shows that Heisenberg exchange is weak or frustrated and competes with antisymmetric Dzialoshinskii-Moriya interactions.

引用

页码：10661 / 10664

页数：4

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