Dynamical dielectric properties of [4-NH2C5H4NH][SbCl4] in the incommensurate phase

Dielectric dispersion is shown to occur at radio-frequencies in single crystals of [4-NH2C5H4NH][SbCl4] in the frequency range of 200 Hz-1 MHz. It is found that dielectric dispersion, measured in the incommensurate phase (270.5-304 K) along the [102] direction of the monoclinic symmetry, is monodispersive, except for the close vicinity of T-c = 270.5 K, for T < T-c + 1 K. In the incommensurate phase (for T > T-c) the apparent critical slowing down is found with tau approximate to 1 X 10(-4) s just above T-c.