Origin of the Monoclinic-to-Monoclinic Phase Transition and Evidence for the Centrosymmetric Crystal Structure of BiMnO.
Structural properties of polycrystalline single-phased BiMnO samples prepared at 6 GPa and 1383 K have been studied by selected area electron diffraction (SAED), convergent beam electron diffraction (CBED), and the Rietveld method using neutron diffraction data measured at 300 and 550 K. The SAED an...
| Publicado en: | Journal of the American Chemical Society Vol. 129; no. 4; pp. 971 - 978 |
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| Autores principales: | , , , , , , , , , , |
| Formato: | Artículo |
| Publicado: |
American Chemical Society
1/31/2007
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=24049380&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 24049380 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 1/31/2007 vid: 129 iid: 4 pid: 997 pub: American Chemical Society artinfo: ui: 24049380 10.1021/ja0664032 ppf: 971 ppct: 7 formats: tig: atl: Origin of the Monoclinic-to-Monoclinic Phase Transition and Evidence for the Centrosymmetric Crystal Structure of BiMnO. aug: au: Belik, Alexei A. Iikubo, Satoshi Yokosawa, Tadahiro Kodama, Katsuaki Igawa, Naoki Shamoto, Shinichi Azuma, Masaki Takano, Mikio Kimoto, Koji Matsui, Yoshio Takayama-Muromachi, Eiji affil: Contribution from the Advanced Nano Materials Laboratory (ANML) Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan High Voltage Electron Microscopy Station (HVEMS), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-00/1, Japan PRESTO, Japan Science and Technology Corporation (JST), Kawaguchi, Saitama 332-0012, Japan su: Crystals Electron diffraction Optical diffraction Neutron diffraction Crystallization sug: subj: Crystals Electron diffraction Optical diffraction Neutron diffraction Crystallization ab: Structural properties of polycrystalline single-phased BiMnO samples prepared at 6 GPa and 1383 K have been studied by selected area electron diffraction (SAED), convergent beam electron diffraction (CBED), and the Rietveld method using neutron diffraction data measured at 300 and 550 K. The SAED and CBED data showed that BiMnO crystallizes in the centrosymmetric space group C2/c at 300 K. The crystallographic data are a = 9.5415(2) Å, b = 5.61 263(8) Å, c = 9.8632(2) Å, β = 110.6584(12)° at 300 K and a = 9.5866(3) Å, b = 5.59903(15) Å, c = 9.7427(3) Å, β = 108.601 (2)° at 550 K, Z= 8, space group C2/c. The analysis of Mn-O bond lengths suggested that the orbital order present in BiMnO at 300 K melts above T = 474 K. The phase transition at 474 K is of the first order and accompanied by a jump of magnetization and small changes of the effective magnetic moment and Weiss temperature, μ = 4.69μ and θ = 138.0 K at 300-450 K and μ = 4.79μ and θ = 132.6 K at 480-600 K. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2007 holdings: @attributes: islocal: N |
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