CRYSTAL-GROWTH OF PBMG1 3NB2/3O3 AND PBZN1/3NB2/3O3 AND STRUCTURAL STUDIES ON THE ORDERING/

Single crystals of PbMg1/3Nb2/3O3 and PbZn1/3Nb2/3O3 were grown from t he high temperature solution using the PbO/B2O3 flux up to 10 mm in si ze. The formation of the pyrochlore crystals during the growth of PbMg 1/3Nb2/3O3 could be prevented by the addition of excess MgO in the sol ution. The crystal PbMg1/3Nb2/3O3 grown by TSSG technique contained a large amount of defects. The 1:1 ordering of Mg and Nb ions in the PbM g1/3Nb2/3O3 could be confirmed by electron diffraction. The ferroelect ric domains in PbZn1/3Nb2/3O3 were observed under polarizing microscop e with applied electric field.