Adamiv V. Optical and physical properties of BaB2O4 single crystals grown in a- and b-phases.

The growth technologies are developed and optically qualitative barium borate single crystals of both structural phases are grown. The microhardness, microfragility, linear thermal expantion and electroconductivity for single crystals of a- and b-phases are investigated. The values of all piezooptical and elastooptical coefficients for b-BaB2O4 crystals are obtained and the coefficient of acoustooptical quality for these crystals is determined. It is shown that b-BaB2O4 crystals are perspective acoustooptical materials. The high light efficiency of X-ray luminescence for a-BaB2O4 crystals is ascertained and the perspectives for development of detectors of ionized radiation on the basis of these crystals are shown. The pyroelectric scintillation in b-BaB2O4 crystals in wide themperature region is ascertained.