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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$$_{3+delta}$$ ($$delta$$=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 $$C2/c$$. BiMnO$$_{3.08}$$ crystallizes in space group $$P2_1/c$$. 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$$_3$$). 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$$_3$$). BiMnO$$_{3.03}$$ and BiMnO$$_{3.08}$$ are ferromagnetic below T$$_c$$ = 82 and 68 K, respectively, with magnetic moments along the monoclinic b axes. Refined magnetic moments at 10 K are 2.88(2) $$mu_B$$ in BiMnO$$_{3.03}$$ and 2.33(2) $$mu_B$$ in BiMnO$$_{3.08}$$. BiMnO$$_{3.14}$$ crystallizes in an orthorhombic system with space group $$Pnma$$, 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$$_{3+delta}$$ ($$0.02 le delta le 0.14$$) 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 $$delta$$.

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Category:Chemistry, Multidisciplinary

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