Sr2NiOsO6和Ca2NiOsO6的合成、结构及磁性能：两种新型含锇双钙钛矿

Synthesis, structure, and magnetic properties of Sr2NiOsO6 and Ca2NiOsO6: two new osmium-containing double perovskites.

作者信息

Macquart René, Kim Seung-Joo, Gemmill William R, Stalick Judith K, Lee Yongjae, Vogt Tom, zur Loye Hans-Conrad

机构信息

Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.

出版信息

Inorg Chem. 2005 Dec 26;44(26):9676-83. doi: 10.1021/ic051045+.

DOI:10.1021/ic051045+

PMID:16363836

Abstract

Two new double perovskite oxides, Ca(2)NiOsO(6) and Sr(2)NiOsO(6), have been prepared as polycrystalline powders by solid state synthesis. The two oxides were structurally characterized by variable-temperature powder neutron diffraction. Ca(2)NiOsO(6) was found to adopt a monoclinic structure (P2(1)/n), while Sr(2)NiOsO(6) was found to be tetragonal (I4/m). Magnetic susceptibility measurements indicate that Ca(2)NiOsO(6) orders in a canted antiferromagnetic state at about 175 K while Sr(2)NiOsO(6) orders antiferromagnetically at about 50 K.

摘要

通过固态合成法制备了两种新型双钙钛矿氧化物Ca₂NiOsO₆和Sr₂NiOsO₆的多晶粉末。通过变温粉末中子衍射对这两种氧化物进行了结构表征。发现Ca₂NiOsO₆具有单斜结构（P2₁/n），而Sr₂NiOsO₆为四方结构（I4/m）。磁化率测量表明，Ca₂NiOsO₆在约175K时呈倾斜反铁磁态有序排列，而Sr₂NiOsO₆在约50K时呈反铁磁有序排列。