Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 71, Issue 7, Pages 1694-1697Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.71.1694
Keywords
X-ray diffraction; structure analysis; order parameter; tetragonal phase; methylammonium; triiodideplumbate
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The cubic-tetragonal Phase transition of CH3NH3PbI3 was investigated by single crystal X-ray diffractometry. The crystal structure was refined at five temperatures in the teragonal phase. The PbI6 octahedron rorates around the c-axis alternatively to construct the SrTiO3-type tetragonal structure. A methylammonium ion is Partially orderd; 24 disordered states in the Cubic phase are reduced to 8. With decreasing temperature, the rotation angle of the octahedron increases monotonically. which indicates it is an order parameter of the cubic-tetragonal transition.
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