Spinel-to-CaFeO-Type Structural Transformation in Li MnO under High Pressure.
A new form of LiMnO is reported. The structure is the CaFeO-type and 6% denser than the spinel. The structure transformation was achieved by heating at 6 GPa. Analysis of the neutron diffraction pattern confirmed an average of the structure; the unit cell was orthorhombic at a = 8.8336(5) Å, b = 2.8...
| Publicado en: | Journal of the American Chemical Society Vol. 128; no. 29; pp. 9448 - 9457 |
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| Autores principales: | , , , , , , , , |
| Formato: | Artículo |
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American Chemical Society
7/26/2006
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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=22755433&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 22755433 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: 7/26/2006 vid: 128 iid: 29 pid: 997 pub: American Chemical Society artinfo: ui: 22755433 10.1021/ja0612302 ppf: 9448 ppct: 9 formats: tig: atl: Spinel-to-CaFeO-Type Structural Transformation in Li MnO under High Pressure. aug: au: Yamaura, Kazunari Huang, Qingzhen Zhang, Lianqi Takada, Kazunori Baba, Yuji Nagai, Takuro Matsui, Yoshio Kosuda, Kosuke Takayama-Muromachi, Eiji affil: Advanced Nano Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899. Nanoscale Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. Advanced Nano Characterization Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. Materials Analysis Station, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. su: Neutron diffraction Optical diffraction Constitution of matter Particles (Nuclear physics) Holographic interferometry Leptons (Nuclear physics) sug: subj: Neutron diffraction Optical diffraction Constitution of matter Particles (Nuclear physics) Holographic interferometry Leptons (Nuclear physics) ab: A new form of LiMnO is reported. The structure is the CaFeO-type and 6% denser than the spinel. The structure transformation was achieved by heating at 6 GPa. Analysis of the neutron diffraction pattern confirmed an average of the structure; the unit cell was orthorhombic at a = 8.8336(5) Å, b = 2.83387(18) Å, and c = 10.6535(7) Å (Pnma). Electron diffraction patterns indicated an order of superstructure 3a × b × c, which might be initiated by Li vacancies. The exact composition is estimated at LiMnO from the structure analysis and quantity of intercalated Li. The polycrystalline CaFeO-type compound showed semiconducting-like characters over the studied range above 5 K. The activation energy was reduced to ∼0.27 eV from ∼0.40 eV at the spinel form, suggesting a possible enhancement of hopping mobility. Magnetic and specific-heat data indicated a magnetically glassy transition at ∼10 K. As the CaFeO-type transition was observed for the mineral MgAlO, hence the new form of the lithium manganese oxide would provide valuable opportunities to study not only the magnetism of strongly correlated electrons but also the thermodynamics of the phase transition in the mantle. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2006 holdings: @attributes: islocal: N |
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