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Abstract
The investigation of 93Nb NMR spectra in PMN crystal at 130 K < T < 430 K, v L = 49 MHz and 73 MHz have been carried out. The temperature dependence of line width and spin lattice relaxation time was measured. The peculiarities of these dependences were shown to be connected with Nb ions motion, which was described by the Vogel-Fulcher law in accordance with glassy character of PMN diffused phase transition. NMR spectra modeling by Monte-Carlo numerical method gave evidence about the Nb ions displacement only along [111] directions and its value is x 0 = 0.09 Å with dispersion [sgrave] = 0.01 Å at T = 260 K. NMR data gave no evidence of 1:1 regions existence in PMN crystal.
