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A regression analysis of the temperature dependences of the elastic compliance coefficientsin the tetragonal phase BaTiO 3  has been carried out. Two functions are proposed that have critical temperatures, one of which corresponds tothe second to the rest of the coefficientsFrom the obtained analytical dependences, the temperature dependences of the elasticity tensor componentsin the tetragonal phase are calculated. Formulas for determining the effective coefficient of elasticityand the effective coefficient of elastic complianceare proposed. It is shown thathas minims in the near of structural phase transitions in BaTiO 3 .

ferroelectrics

Determination of the temperature dependences of the coefficients of the elastic compliance tensor and the elasticity tensor in the tetragonal phase BaTiO 3