Large field permittivity of TGS at 20 kHz

The paper gives the results of complex permittivity measurements of triglycine sulphate at large electric field amplitudes (36.6 V/m–386 kV/m) and a frequency of 20 kHz in a temperature range including the Curie temperature (22–53°C). An experimental arrangement for measuring by means of the pulse method is described which was used in order to prevent heating of the sample due to dielectric losses. The relations established between the permittivity and the amplitude of the electric field and temperature are in good qualitative agreement with the corresponding results obtained by calculation in the paper of J. Fousek [J. Appl. Phys. 36 (1965), 588].The authors are indebted to Dr. Z. Málek, Dr. J. Fousek, Ing. J. Janta, M. Marvan, Ing. J. Mastner and J. Fiala for valuable discussions and comments, to Ing. Z. Vojta for his help in realizing the electronic apparatus and to K. Müller for the careful preparation of the figures for publication.