Anomalies of dielectric and acoustic characteristics of the TGS crystal in the phase transition region under nonuniform pressure conditions

Temperature dependences of permittivity and sound velocity and damping near the second-order transition in crystals subjected to nonuniform uniaxial pressure are calculated. The presence of pressure gradients causes broadening of the temperature range within which physical property anomalies are observed. The most substantial changes in the sound damping occur when the pressure gradient is normal to the wave vector of acoustic wave.