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The crystal structure of (i-C4H9NH3)3Bi2Br9 at room temperature has been determined and refined to R=0.036. The crystal is orthorhombic, space group Ama2. The structure is built up of the i-butylammonium cations and isolated Bi2Br93− anions. The complex dielectric permittivity along the a-axis has been measured between 500Hz and 1000MHz in the vicinity of two phase transitions at 252 and 263K. The...
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