Asahi, T.

Kasano, H.

Kawamura, Y.

Kimura, H.

Noda, Y.

マシヤマ, ヒロユキ

増山, 博行

In order to understand the mechanism of the structural phase transition in CH_3NH_3PbBr_3, neutron diffraction data from the single crystal is analyzed by the least-squares method and the maximum entropy method. The disordered configuration of a methylammonium ion in a cage surrounded by eight PbBr_6 octahedrons is identified unambiguously. With comparing the low-temperature structure, the transition is characterized by the condensation of the rotational motion of the PbBr_6 octahedron around the Pb-Br axis, which accompanies the partial ordering of the methylammonium ion to reduce the site symmetry

Disordered Configuration of Methylammonium of CH_3NH_3PbBr_3 Determined by Single Crystal Neutron Diffractometry

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