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The complex electric permittivity of ferroelectric (CH 3 NH 3 ) 3 Sb 2 Br 9  (MABA) single crystals has been measured in the frequency range 1 kHz - 3 GHz between 15 and 300 K. The dynamic dielectric behaviour of MABA is determined by the properties of high frequency relaxation of Cole-Cole type. It is thermally activated and characterised by a relatively small activation energy. The phase transitions at 168 and 134 K influence the amplitude of the relaxation (Δε) without any important changes in the relaxation frequency.

On the Dynamic Dielectric Behaviour of (CH 3 NH 3 ) 3 Sb 2 Br 9 (MABA)