LaPbMnSbO6化合物的结构精修和磁性表征

doi:10.11944/j.issn.1000-0518.2015.03.140159

摘要/Abstract

摘要：

采用半化学两步法合成了双钙钛矿氧化物LaPbMnSbO₆,研究了其晶体结构和磁学性质。通过对XRD谱图进行Rietveld结构精修可以得到,该化合物为单斜晶系的P2₁/n(No.14)空间群,B位MnO₆和SbO₆八面体为岩盐有序结构。由于A位Pb²⁺离子的存在而产生二级Jahn-Teller效应,使得B位八面体内部晶格畸变具有各向异性。磁性测试表明该样品呈典型的反铁磁有序特征,反铁磁转变温度T_N=9 K。

关键词: 双钙钛矿氧化物, 半化学两步法, 结构精修, 磁性

Abstract:

Double perovskite LaPbMnSbO₆ was synthesized by two-step semi-chemical method, and the crystal structure and magnetic properties have been investigated. The crystal structure has been solved by X-ray diffraction (XRD) data in the monoclinic space group P2₁/n (No.14). The MnO₆ and SbO₆ octahedra are rock-salt ordered over the B-site of the perovskite structure. Due to the existence of Pb²⁺ ions, second-order Jahn-Teller effect is occurred and the lattice distortions are anisotropic in the interior of BO₆ octahedra. The magnetization curves show a typical antiferromagnetic ordering, with an antiferromagnetic ordering transition temperature at T_N=9 K.

Key words: double perovskites, two-step semi-chemical, structure refinements, magnetic properties

中图分类号:

韩琳, 刘孝娟, 孟君玲, 姚传刚, 武晓杰, 孟健. LaPbMnSbO₆化合物的结构精修和磁性表征[J]. 应用化学, 2015, 32(3): 350-355.

HAN Lin, LIU Xiaojuan, MENG Junling, YAO Chuan'gang, WU Xiaojie, MENG Jian. Structure Refinements and Magnetic Properties of LaPbMnSbO₆[J]. Chinese Journal of Applied Chemistry, 2015, 32(3): 350-355.

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LaPbMnSbO₆化合物的结构精修和磁性表征

Structure Refinements and Magnetic Properties of LaPbMnSbO₆

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