Crystal and magnetic structures and properties of BiMnO $_{3+delta}$

Belik, A. A.*; Kodama, Katsuaki ; Igawa, Naoki ; Shamoto, Shinichi ; Kosuda, Kosuke*; Muromachi, Eiji*

Crystal and magnetic structures of BiMnO $_{3+delta}$ (=0.03, 0.08, and 0.14) have been determined by the Rietveld method from neutron diffraction data at 8-10 and 290 K. BiMnO $_{3.03}$ crystallizes in a monoclinic system with space group . BiMnO $_{3.08}$ crystallizes in space group . It was found that Mn vacancies are localized mainly in one Mn site (among three sites) in BiMnO $_{3.08}$ (=Bi $_{0.974}$ Mn $_{0.974}$ O). Vacancy-ordering and charge-ordering scenarios are suggested as possible reasons for the crystal symmetry change compared with BiMnO $_{3.03}$ (=Bi $_{0.99}$ Mn $_{0.99}$ O). BiMnO $_{3.03}$ and BiMnO $_{3.08}$ are ferromagnetic below T = 82 and 68 K, respectively, with magnetic moments along the monoclinic b axes. Refined magnetic moments at 10 K are 2.88(2) in BiMnO $_{3.03}$ and 2.33(2) in BiMnO $_{3.08}$ . BiMnO $_{3.14}$ crystallizes in an orthorhombic system with space group , and its structure is similar to that of LaMnO $_{3.11}$ -LaMnO $_{3.15}$ . No magnetic reflections were found in BiMnO $_{3.14}$ down to 8 K, in agreement with its spin-glass magnetic state. Magnetic and chemical properties of BiMnO $_{3+delta}$ () have also been investigated and compared with those of LaMnO $_{3+delta}$ . Systematic changes of magnetic parameters in BiMnO $_{3+delta}$ were found to depend on .

Language	:	English
Journal	:	Journal of the American Chemical Society
Volume	:	132
Number	:	23
Pages	:	p.8137 - 8144
Publication Year/Month	:	2010/05
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Paper URL	:	https://doi.org/10.1021/ja102014n
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Registration No. : AA20100381
JAEA Abstracts No. : 38001301
Paper Submission No. : 7942

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