Ferroelectric properties of the [N(CH3)4]2CoCl2Br2 compound

Synthesis, X-ray powder and Raman description are reported for [N(CH3)4]2CoCl2Br2 compound. The calorimetric study shows three endothermic peaks at 289 K, 323 K and 408 K. The compound crystallizes in the orthorhombic system, space group Pnma with a = 12.384 Å, b = 9.058 Å and c = 15.647 Å. The dielectric spectra were measured in the frequency range 10−1–106 Hz and temperature interval from 200 to 305 K. The dielectric permittivity shows that this compound exhibits a ferroelectric–paraelectric phase transition at 290 K. The frequency dependent permittivity is interpreted in the non-Debye model. The temperature dependence of the low frequency limit of the bulk AC conductivity σdc is well described by the Arrhenius equation: σdc = σ0 exp(−Ea/kT).