Abstract
The electrical and optical constant of potassium iodate have been determined. The crystals are found to be ferroelectric in the whole temperature range from −163°C to 214°C. Phase transitions of first order occur at −163°C, −15°C, 72.5°C and 214°C respectively. They can be related to the abrupt changes in the optical and electrical properties. The piezoelectric as well as the reciprocal piezoelectric effects have been measured in the range 20°C to 200°C. The crystals show at room temperature a very strong electro-optical effect.

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