Acta Cryst. (2006). B62, 960-965 [ doi:10.1107/S0108768106038869 ]
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x 0.82Abstract: The structure of strontium barium niobate crystals SrxBa1 - xNb2O6 is comprehensively studied in the whole range of the tetragonal tungsten bronze phase (x = 0.32-0.82) using both powder and single-crystal X-ray diffraction measurements. Unit-cell parameters, density, site-occupancy factors and interionic distances show an explicit composition dependence which can be consistently explained using simple model calculations. The temperature dependence of the unit-cell parameters exhibits a remarkable anisotropy in a broad temperature region below the phase transition temperature. This proves that the electrostrictive contribution to the thermal expansion plays an important role in strontium barium niobate.
Keywords: tungsten bronze; single crystal growth; niobates; ferroelectric materials.
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