Effects of γ-Irradiation on Tri-Glycine Sulfate

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Abstract
The effects of γ-irradiation below the Curie point on the ferroelectric tri-glycine sulfate (TGS) were examined. Principal among these effects is the change, as a function of radiation dose, of the energy absorbed by a sample in going from the polar state to the non-polar state. This energy was found to be 0.73 cal/g for a virgin sample and 0.44 cal/g for a sample irradiated to 5 × 106 r. The shift of the Curie point toward lower temperatures (∼ 5° C for 5 × 106 r) was found in the specific heat measurements as well as in the electrical measurements. The internal bias which appears in the hysteresis loops of irradiated samples was studied as a function of temperature, sample thickness, and time of application of the a.c. measuring field. Both the internal bias and the coercive field exhibit a linear increase with increased γ-ray dose.

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