Growth and dielectric properties of Ca4GdO(BO3)3 single crystals

Abstract

Single crystals of Ca4GdO(BO3)3 have ben grown from a melt by the Czochralski puling method making use seed orientation. Defects, like dislocation were investigated. Chemical methods were developed on various planes of crystals, in order to reveal the nature and the distribution of these defects. Dielectric measurements in frequency range 20Hz-13MHz in three main crystallographic directions were carried out. The values of elastic and piezoelectric coefficients were calculated for the first mode of piezoelectric vibration in each direction.