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The structure of the Sr 0.75 Ba 0.25 Nb 2 O 6 single crystal has been investigated by x-ray diffraction. The occupancies of the Ba and Sr sites in two structural channels are determined. It is found that these sites are split in the large (pentagonal) channel. A qualitative correlation is revealed between the smearing of the phase transition and the displacement of the Sr atom from the m symmetry plane in the pentagonal channel at different [Sr]/[Ba] ratios. The degree of acentricity of the NbO 6 octahedra is analyzed as a function of the [Sr]/[Ba] ratio.
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Chernaya et al. (2000) studied this question.
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