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Oxide ion conduction mechanism in RE9.33(SiO4)6O2 and Sr2RE8(SiO4)6O2 (RE = La, Nd) from neutron powder diffraction

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Title: Oxide ion conduction mechanism in RE9.33(SiO4)6O2 and Sr2RE8(SiO4)6O2 (RE = La, Nd) from neutron powder diffraction
Authors: Masubuchi, Yuji Browse this author →KAKEN DB
Higuchi, Mikio Browse this author →KAKEN DB
Takeda, Takashi Browse this author
Kikkawa, Shinichi4 Browse this author →KAKEN DB
Authors(alt): 吉川, 信一4
Keywords: Oxide ion conductor
apatite-type structure
conduction mechanism
neutron diffraction
maximum entropy method
Issue Date: Jan-2006
Publisher: Elsevier B.V.
Journal Title: Solid State Ionics
Volume: 177
Issue: 3-4
Start Page: 263
End Page: 268
Publisher DOI: 10.1016/j.ssi.2005.09.015
Abstract: Oxide ion conduction mechanism was clarified by Rietveld and MEM analysis for both RE9.33(SiO4)6O2 and Sr2RE8(SiO4)6O2 (RE = La and Nd) in high purity using neutron powder diffraction data collected at room temperature. All compounds had an apatite type structure in space group P63/m. There was neither site splitting nor interstitial site of oxide ion. RE9.33(SiO4)6O2 had cation vacancies only at 4f site. In Sr2RE8(SiO4)6O2, the 4f sites were fully occupied by strontium and rare earth with a molar ratio of 1:1. Oxide ion at hexagonal channel site had large displacement along c-axis in RE9.33(SiO4)6O2. The large displacement is induced by cooperative rotation of SiO4 tetrahedra around rare earth in 4f site through oxide ion polyhedra around another rare earth in 6h site. The displacement, enhanced by a vacancy in the 4f site, is directly related to the oxide ion conduction in RE9.33(SiO4)6O2.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 吉川 信一

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