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Displacive Character of the Cubic-Tetragonal Transition in CH$_3$NH$_3$PbX$_3$
H. Mashiyama,E. Magome,Y. Kawamura,Y. Kubota 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
The cubic-tetragonal phase transition in CH3NH3PbBr3 is investigated from the detailed structural analysis. The powder diraction proles, obtained with using a Debye-Scherrer camera installed at SPring-8, are analyzed by a Rietveld pattern tting program. The lattice parameters change as if a second order transition takes place, with accompanying superlattice re ections. In the cubic phase, the structure could be rened either by the displacive model or by the orderdisorder model. But the latter model is not fully consistent throughout the transition. The former model gives the rotating angle of the PbBr6 octhedron, which increases monotonically with decreasing temperature. The angle is considered to be an order parameter, and the displacive character of the phase transition is concluded in CH3NH3PbBr3 and CH3NH3PbI3.