Laser- and gamma-ray induced crystallization of IR-transmitting calcium gallate glass

Ar⁺-laser (=488 nm) irradiation of calcium gallate (CG) glass with the composition of 60CaO·39Ga₂O₃·Fe₂O₃ resulted in a distinct decrease in the IR transmittance (T) due to the formation of crystalline CaGa₂O₄ and CaGa₄O₉ phases. The Mössbauer spectrum of non-irradiated glass comprised a broad doublet due to distorted Fe³⁺(T_d) with, , and of 0.20, 1.33, and 1.00 mm s^–1, respectively. An additional doublet due to Fe³⁺(T_d) was observed in the Ar⁺-irradiated glass and, , and were 0.17, 1.32, and 0.75 mm s^–1, respectively. A decrease inT was also observed after the⁶⁰Co -ray irradiation with doses 10⁵Gy, and the precipitation of CaO, Ga₂O₃, and CaGa₄O₇ phases was confirmed by X-ray diffraction.