Crystal and magnetic structures and properties of BiMnO3+delta;

Alexei A. Belik, Katsuaki Kodama, Naoki Igawa, Shin Ichi Shamoto, Kosuke Kosuda, Eiji Takayama-Muromachi

研究成果: Article同行評審

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Crystal and magnetic structures of BiMnO3+δ (δ = 0.03, 0.08, and 0.14) have been determined by the Rietveld method from neutron diffraction data at 8-10 and 290 K. BiMnO3.03 (=Bi 0.99Mn0.99O3) crystallizes in a monoclinic system (the refinement was performed in space group C2/c; Z = 8; a = 9.5313(3) Å, b = 5.57791(17) Å, c = 9.7375(4) Å, β = 108.951(2)° at 290 K). BiMnO3.08 (=Bi0.974Mn 0.974O3) crystallizes in space group P21/c (Z = 8; a = 9.5565(4) Å, b = 5.51823(16) Å, c = 9.7051(4) Å, β = 109.442(3)° at 290 K). It was found that Mn vacancies are localized mainly in one Mn site (among three sites) in Bi0.974Mn 0.974O3. Vacancy-ordering and charge-ordering scenarios are suggested as possible reasons for the crystal symmetry change compared with Bi0.99Mn0.99O3. BiMnO3.03 and BiMnO3.08 are ferromagnetic below TC = 82 and 68 K, respectively, with magnetic moments along the monoclinic b axes. Refined magnetic moments at 10 K are 2.88(2)μB in BiMnO3.03 and 2.33(2)μB in BiMnO3.08. BiMnO3.14 (=Bi 0.955Mn0.955O3) crystallizes in an orthorhombic system (space group Pnma; Z = 4; a = 5.5136(4) Å, b = 7.8069(8) Å, and c = 5.5454(5) Å at 290 K), and its structure is similar to that of LaMnO3.11-LaMnO3.15. No magnetic reflections were found in BiMnO3.14 down to 8 K, in agreement with its spin-glass magnetic state. Magnetic and chemical properties of BiMnO3+δ (0.02 ≤ δ ≤ 0.14) have also been investigated and compared with those of LaMnO3+δ. Systematic changes of magnetic parameters in BiMnO3+δ were found to depend on δ.

頁(從 - 到)8137-8144
期刊Journal of the American Chemical Society
出版狀態Published - 2010 6月 16

All Science Journal Classification (ASJC) codes

  • 催化
  • 化學 (全部)
  • 生物化學
  • 膠體和表面化學


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