The results of X-ray diffraction measurements of a lead magnoniobate single crystal-PbMg 1 3/Nb 2 3/O 3 , performed on a four-circle diffractometer with Mo K alpha radiation, are described. It is confirmed that even at relatively high temperatures lead ions are shifted from the high-symmetry position. It is shown that these shifts are random both in length and direction. A spherical layer model is proposed for the adequate description of the experimental data. The correspondence between the crystal structure and the physical properties of the crystal is discussed.
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Vakhrushev et al. (1994) studied this question.
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