Thermodynamically induced structural transformation to a polar phase in the tetraethylammonium tetrahalogenocobaltate solid solution of [N(C 2 H 5 ) 4 ] 2 CoClBr 3 (TEACCB-3) is found to be accompanied with a large dielectric permittivity peak near 258 K. It was also found that the sample undergoes a ferrimagnetic ordering on further cooling below 8 K. Our results demonstrate that crystalline ferroics with an alkylammonium cation can develop strong magnetic interactions reaching 2.3 m B fu À1 at 14 T that can potentially coexist with electric polarization at the same temperature region.
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