Abstract
The optical (transmission and circular dichroism) spectra and mechanical (Vickers microhardness and fracture toughness K 1c ) properties of langasite La3Ga5SiO14 crystals have been studied after γ irradiation and exposure for a month. It is shown that, as a result of irradiation crystals become more transparent in the range 310–640 nm, nonstructural defects with the energies of excited states in the range 2.06–4.13 eV decay and new structural defects with the excited-state energies in the range 4.14–5.00 eV are formed. Irradiation does not lead to a change in microhardness, while the coefficient K 1c increases from 0.32 to 0.36 MPa m1/2.
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