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Dielectric properties have been studied for single crystals of various TMMnC (N(CH3)4MnCl3)-type compounds; TMMnC, TMMnB, TMNiC, TMNiB, TMCdC, TMCdB, and TMCuC, Dielectric constants show stepwise anomalies at the structural phase transitions of these compounds. In TMCdB, ferroelectricity is found below the Curie temperature of about 156 K (on cooling). For other compounds, no ferroelectricity nor pyroelectricity has been detected in the low temperature phases.
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