Effect of electron and gamma irradiation on elastic characteristics of KTiOPO4 crystals

The elastic moduli C ₁₁ and C ₃₃ of KTiOPO₄ crystals unirradiated and irradiated by electrons and gamma quanta in the temperature range 100–330 K have been measured by the echo-pulse technique. It has been shown that C ₁₁ < C ₃₃ and, with increasing temperature, their values smoothly decrease; moreover, in the temperature range of the second-order phase transition at T ～ 281 K, the curves C ₁₁ = f(T) and C ₃₃ = f(T) exhibit anomalies in the form of a kink. It has been established that, under electron irradiation, the elastic moduli decrease and the phase transition temperature increases. Irradiation of KTiOPO₄ crystals by gamma quanta with a dose of 10⁷ R has no substantial effect on the dynamic characteristics of this crystal.