Structural and magnetic chemistry of NdBaCo2O5+δ

被引：123

作者：

Burley, JC ^{[1
]}

Mitchell, JF ^{[1
]}

Short, S ^{[1
]}

Miller, D ^{[1
]}

Tang, Y ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2003年 / 170卷 / 02期

关键词：

D O I：

10.1016/S0022-4596(02)00101-9

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The crystallographic and magnetic structures of the oxygen-deficient perovskites NdBaCo2O5+delta (delta = 0, 0.38, 0.5, 0.69) have been studied as a function of temperature by neutron powder diffraction. Long-range G-type antiferromagnetic order is realized for all samples apart from that with delta = 0.5. The lack of magnetic order for delta = 0.5 can be understood on the basis of a crystal-field-induced spin-state ordering between low-spin and high-spin Co3+. Contrary to studies of similar materials with smaller lanthanides, the delta = 0 material exhibits no evidence of long-range charge ordering. No evidence of a spin-state transition as observed in YBaCo2O5 is found for any of our samples. (C) 2002 Elsevier Science (USA). All rights reserved.

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页码：339 / 350

页数：12

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