Thermal expansion coefficients of strontium ‐ barium niobate single crystals in the vicinity of the phase transition point

This is the authors' abstract. We don't add key points for this paper.

High quality of solid solution single crystals SrxBa1‐xNb2O6 (0.35 <x < 0.72) obtained by the Czochralski method were investigated. The lattice parameters of these single crystals were determined, using X‐ray measurements, with an uncertainty as low as of the order of . Registered temperature changes of lattice parameters have permitted to calculate thermal expansion coefficients with low relative uncertainties, which were determined in the temperature range from 293 to 323 K along [100] and [001] directions. Based on the thermal expansion coefficients it was possible to assign the phase transition temperature for all studied compositions. Additionally, the observed character of changes of the linear thermal expansion coefficients clearly indicates a possible first‐order character of the investigated structural phase transition.