Cationic Dynamics and Phase Transitions in (CH 3 NH 3 ) 3 Bi 2 Br 9 as Studied by Proton Magnetic Resonance
作者： Piotr KozioŁ , Yoshihiro Furukawa , Daiyu Nakamura
DOI: 10.1143/JPSJ.60.3850
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摘要: Molecular motions and phase transitions in tris(methylammonium) nonabromodibismuthate (III), (CH 3 NH ) Bi 2 Br 9 , were investigated by measuring the temperature dependences of static rotating frame 1 H spin-lattice relaxation times ( T ans 1ρ second moment M NMR absorptions. Near 80 K lowest-temperature IV, orientation methylammonium cation is almost fixed but itself rapidly about C-N bond axis. On heating, gradual disordering cationic orientations takes place phases IV III for two thirds crystallographically nonequivalent cations II remaining cations. Finally, all become to be dynamically disordered undergo rapid overall reorientations room-temperature I. The IV-III transition at 108 may connected dynamics inorganic (Bi 3- n subsystem rather than ionic motions. An anomalous behavior attributable cross relaxa...
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