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The interaction between strain and order parameter at the structural transition in SrTi03 is investigated by ultrasonic measurements of attenuation, velocity shifts, and stress dependence of the transition temperature T, . A method is described by which measurements of domain attenuation are used to correct the velocity data below T,. Also, biaxial pressure has been successfully used to suppress the domain structure in the tetragonal phase. By comparing the experimental results with the consequences of aphenomenological configurational potential the interaction parameters are deduced. The model is found to correlate the experimental results in a consistent way. The hydrostatic-pressure dependence of T, is predicted to be dT,/dp = 0. 5 x 10 K/dyn cm . Critical effects in sound velocity and attenuation are briefly described.

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