Dielectric response of KCN crystal at ultralow frequencies

The dielec. response of pure KCN crystals ( Ã', Ã", and tan Â) was measured as a function of temp. in the frequency range 10-2 to 104 Hz. In the antiferroelec. phase the width of the loss peak is found practically independent of temp. and close to Debye behavior; the relaxation time of the CN- dipoles is characterized by an Arrhenius behavior Ñ = Ñ0exp (U/KT) with Ñ3 = 7.26 '~ 10-15 s and U = 0, 147 eV confirming a classical temp. activated reorientation of the dipoles