DOMAIN-STRUCTURE AND ELECTRICAL-PROPERTIES OF BETA-BAB2O4 SINGLE-CRYSTALS GROWN BY DIRECT CZOCHRALSKI METHOD

Domain structure of beta-BaB2O4 (BBO) crystals were determined by chem ical etching. It was found that crystals grown by the direct Czochrals ki method show mostly single-domain. Pyroelectric and piezoelectric pr operties of BBO were studied. Pyroelectric coefficient of BBO has posi tive sign and the value of the coefficient is p = (1.27 +/- 0.08) x 10 (-5) C/m(2)K. Piezoelectric strain coefficients were: d(33) = 0.15 x 1 0(-11) C/N, d(22) = 0.22 x 10(-11) C/N and d(31) = 0.049 x 10(-11) C/N . Electrical conductivity of BBO was measured as a function of tempera ture in range 340-720 degrees C. Arrhenius activation energy was 1.68 eV.