Unique features of the crystal structure of the (PbMg1/3Nb2/3O3)(0.6)-(PbTiO3)(0.4) solid solution

An x-ray diffraction study of the paraphase of the (PbMg1/3Nb2/3O3)(0.6)-(P bTiO3)(0.4) solid solution has been found to exhibit a clearly pronounced f erroelectric transition. It is shown that Pb2+ ions occupy a special positi on (000), as opposed to pure PMN and other relaxor ferroelectrics, where th ey are displaced from it in random directions. The absence of these displac ements indicates suppression of frozen-in random electric fields in this co mpound. (C) 1999 American Institute of Physics. [S1063-7834(99)03307-9].