X-Ray damage on tgs: A thermodynamic theory

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Abstract
Dielectric measurements on the effects produced in TGS by exposure to the radiation of a Cu conventional X-ray diffraction tube have been made with a non-disturbing method. A decrease of the dielectric constant with irradiation time is observed; it is less and less pronounced as the irradiation temperature approaches Tc. Above that no change is observed after 2 hours of irradiation. If a crystal irradiated above Tc is cooled and irradiated again at room temperature, no change occurs to the ferroelectric properties; it appears as if the previous irradiation protects the crystal against further irradiation effects (“vaccine effect”). The results have been explained fairly well by a modification of the free entalphy expression developed in powers of P and introducing odd terms for the coefficients as a function of the irradiation time.

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