Neutron diffraction studies on SrxBa1−xNb2O6single crystals with x = 0.75, 0.70, 0.61, 0.50 and 0.46

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Abstract
SBN mixed crystals of various compositions are investigated between 100 K and 700 K with time-of-flight technique. A slight peak splitting is generally detectable and the decrease of a tetragonal symmetry is discussed in connection with the occurrence of IC modulation. Except a weak increase at x > 0.70 the IC modulation parameter is found to be nearly independent of composition. The existence of the low-lying phase transition (PT) is confirmed by an anomalous temperature dependence of Bragg intensities; the pecularities of the diffuse PT of samples with x ≥ 0.70 are studied using diffuse scattering.