Abstract
Thermal properties of barium sodium niobate crystals were investigated by means of light scattering methods in the temperature range of 20–600°С. Three types of pictures, ellipses, rounds, stripes, have been observed on the screen in the far field depending on the temperature and polarization of the laser beam relatively to the crystallographic axes. The changes of the type of scattering are correlated with structural phase transitions at about 300 °C and 560 °C and with the evolution of the nano-domain structures at about 200 °C and 250 °C. Image analysis in the temperature region of 20–600 °C and comparison with the structural investigations below 300 °C allow to made conclusion that incommensurate phase in the temperature range of about 500–550 °C has the quasi-tetragonal symmetry.
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