A-Site-Doping Enhanced B-Site Ordering and Correlated Magnetic Property in La2-xBixCoMnO6

被引：52

作者：

Bai, Yijia ^{[1
,3
]}

Xia, Yanjie ^{[1
,3
]}

Li, Hongping ^{[1
,3
]}

Han, Lin ^{[1
,3
]}

Wang, Zhongchang ^{[2
]}

Wu, Xiaojie ^{[1
]}

Lv, Shuhui ^{[1
,3
]}

Liu, Xiaojuan ^{[1
]}

Meng, Jian ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resources Utilizat, Changchun 130022, Peoples R China

[2] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Aoba Ku, Sendai, Miyagi 9808577, Japan

[3] Chinese Acad Sci, Grad Sch, Beijing 10049, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 32期

基金：

中国国家自然科学基金;

关键词：

RAY PHOTOELECTRON-SPECTROSCOPY; PEROVSKITES; LA2COMNO6; MANGANESE; SYMMETRY; FE; NI; CO;

D O I：

10.1021/jp302735x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of Bi-doped La2-xBixCoMnO6 double perovskite oxides are synthesized, and the impact of doping on crystal structures and magnetic properties is investigated comprehensively. Xray photoelectron spectroscopy and Raman spectrum analyses reveal that ordering of Co and Mn ions at B-site is gradually improved with the rise of Bi concentration. Meanwhile, magnetic disordering is suppressed greatly by showing larger magnetic moments. Structurally, the Rietveld refinement shows that the bonds are elongated, while the bond angles are shrunken after doping, giving rise to lowered Curie temperature. We also observe a large negative zero-field-cooling magnetization, which is attributed to the formation of spin antiparallel or canted ferromagnetic domains and clusters that are separated by the antiphase boundaries. First-principles calculations confirm the enhanced Co-Mn ordering upon Bi doping by taking into account both the ordering and disordering configurations of La2CoMnO6, LaBiCoMnO6, and Bi2CoMnO6. Moreover, we find a spin-state transition in the antisite Co ions from high-spin (Co2+-t(2g)(5)e(g)(2)) to low-spin state (Co3+-t(2g)(6)e(g)(0)), which is consistent with the increased total magnetic moments by the Bi doping.

引用

页码：16841 / 16847

页数：7

共 44 条

[1] B-CATION ARRANGEMENTS IN DOUBLE PEROVSKITES [J].