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The dielectric permittivity ε′ values of triglycine sulphate (TGS) compressed powders with different grain sizes: (1–300) μm have been measured from 300 to 350K. It has been shown that ε′ max and transition temperature T c for the average grain size of about 30μm behave as predicted by the theory of Wang et al. [J. Phys: Condens. Matter 7 (1995) 7163] for cylindric particle geometry.
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