The strontium barium niobate (Sr_xBa_1-xNb₂O₆ - SBN) with space group P4bm is relaxor ferroelectrics that have attracted considerable interest for its excellent optical, photorefractive and dielectric properties. Recently these materials are extensively studied because of its special smearing phase transitions. This broadened phase transition is probably caused by the wide variation of the non-equivalent crystallographic position in its structure. Our paper is devoted to studies of the SBN crystals with the congruently melting composition – Sr_0.61Ba_0.39Nb₂O₆. The single crystals were obtained by Czochralski method and they have extremely got perfect structure without any striations. Characterization of the investigated crystals was performed by X-ray powder diffraction and scanning electron microscopy with EDS techniques. The used methods confirmed high quality of the specimens and revealed of their anticipated compositions.

The Bond method of the precise lattice parameters measurements (dd/d = 10^-6) was used to study the structure changing of the crystals with a temperature. In this way we could measure lattice parameters of SBN, volume of unit cell and finally to calculate the thermal expansion coefficients. The temperature of the phase transition and its character is also determined.

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