The correlation between the microwave dielectric constant of TGS and the dimensions of its samples in eight millimetre range

Permittivity measurements on triglycine sulfate single crystals at a frequency of 40 GHz as a function of temperature and specimen geometry are reported. In the neighborhood of the phase - transition temperature, the measures indicated the existence of a specific dependence of permittivity on specimen dimensions in the direction perpendicular to the polaraxis. The possible causes of this behavior are discussed.