Growth and study of single crystals of solid solutions of ferroelectric-relaxors (1 − x)PbMg1/3Nb2/3O3-(x)PbSc1/2Nb1/2O3 with different degrees of compositional order

Single crystals of (1 − x)PbMg1/3Nb2/3O3-(x)PbSc1/2Nb1/2O3 (PMN-PSN) solid solutions are grown from flux. The X-ray diffraction patterns of the crystals with 0.1 ≤ x ≤ 0.65 show superstructural reflections associated with ordering of cations in the B sublattice. The changes in the dielectric properties and the degree of phase-transition diffusion with an increase in PSN content qualitatively agree with the model of stoichiometric 1: 1 random-site ordering of B cations in ternary Pb(B 1 3/2+ B 2 3/5+ )O3 oxides and the monotonic dependence of the temperature of the order-disorder phase transition on x in the PMN-PSN system.