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

Masubuchi, Yuji; Higuchi, Mikio; Takeda, Takashi; Kikkawa, Shinichi

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

Masubuchi, Yuji; Higuchi, Mikio; Takeda, Takashi et al.

Solid State Ionics, 2006, 177(3-4), 263-268

Permalink : https://hdl.handle.net/2115/5940

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アクセス権	open access
URI	https://hdl.handle.net/2115/5940
タイトル	Oxide ion conduction mechanism in RE9.33(SiO4)6O2 and Sr2RE8(SiO4)6O2 (RE = La, Nd) from neutron powder diffraction
著者	Masubuchi, Yuji ; Higuchi, Mikio ; Takeda, Takashi ; Kikkawa, Shinichi
e-Rad_Researcher 80466440 著者名 Masubuchi, Yuji
e-Rad_Researcher 40198990 著者名 Higuchi, Mikio
著者名 Takeda, Takashi
e-Rad_Researcher 10127219 著者名 Kikkawa, Shinichi 吉川, 信一
言語	英語
キーワード	Oxide ion conductor
	apatite-type structure
	conduction mechanism
	neutron diffraction
	maximum entropy method
発行日	2006-01
出版者	Elsevier B.V.
収録物名	Solid State Ionics
巻(号)	177(3-4)
ページ	263-268
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0167-2738
関連情報	URI http://www.sciencedirect.com/science/journal/01672738
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.ssi.2005.09.015