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GHCA undergoes four phase transitions at T c1  = 402 K, T c2  = 373 K, T c3  = 162 K, and T c4  = 146 K. Below T c3  it possesses pyroelectric properties with the spontaneous polarization vector (Ps) in the ac plane and the maximum along the c axis equal to 8 μC/m2. Dielectric dispersion studies of GHCA show that the main dielectric dispersion connected probably with collective motions of chlorine ions is above 1GHz. For the phase transition at T c2  to a superionic phase the thermal dilatation and electric conductivity were measured. The anomalies of the electric conductivity at T c2  and T c1  were observed with large values of σ(10 -3  S/m) above T c3 . The guanidinium cations above T c2 , besides reorientational motions, undergo slow self diffusion.

Dielectric Properties and Characterisation of the Superionic Phase of [C(NH 2 ) 3 ] 2 SbCl 5 *[C(NH 2 ) 3 ]Cl (GHCA)