Structural phase transition and electrical conductivity of the perovskite CH3NH3Sn1-xPbxBr3 and CsSnBr3.

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概要

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• A series of solid solutions, CH<SUB>3</SUB>NH<SUB>3</SUB>Sn<SUB>1−<I>x</I></SUB>Pb<I><SUB>x</SUB></I>Br<SUB>3</SUB> (<I>x</I>=0–1), having cubic perovskite structures was obtained by solid-state reactions. The <SUP>119</SUP>Sn Mössbauer spectra for <I>x</I><0.4, however, indicated that the tin environment was considerably distorted from a regular octahedron at 110 K. On the other hand, a single Lorentzian spectrum having a large isomer shift was observed for <I>x</I>>0.7, suggesting the presence of a regular SnBr<SUB>6</SUB> octahedra in the perovskite CH<SUB>3</SUB>NH<SUB>3</SUB>PbBr<SUB>3</SUB> matrix. The high electrical conductivity of the perovskite CsSnBr<SUB>3</SUB> drastically decreased upon the replacement of the cation by CH<SUB>3</SUB>NH<SUB>3</SUB> and the central metal by Pb. This behavior suggests that both the infinite linear chain (–Br–Sn(Pb)–Br–) and its bond length have significant importance regarding electrical conductivity.

• 公益社団法人 日本化学会の論文

著者

• Okuda Tsutomu

  Department Of Bio-recycling Faculty Of Engineering Hiroshima Kokusai Gakuin University

• Kawaguchi Hiroshi

  Department Of Applied Chemistry Faculty Of Engineering Utsunomiya University

• Yamada Koji

  Deparment Of Food Science And Technology Faculty Of Agriculture Kyushu University

• MATSUI Takashi

  Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo

• Ichiba Sumio

  Department of Chemistry, Faculty of Science, Hiroshima University

• Matsui Takashi

  Department of Chemistry, Faculty of Science, Hiroshima University

• Kawaguchi Hiroshi

  Department of Chemistry, Faculty of Science, Hiroshima University

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