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

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概要

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• 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.

• Elsevier B.V.の論文

著者

• 鱒渕 友治

  北大院工

• Masubuchi Yuji

  Graduate School Of Engineering Hokkaido Univ. Sapporo 060-8628 Jpn

• 鱒渕 友治

  北海道大学工学研究院物質化学部門

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