Optical and acoustic properties of 33PbIn1/2Nb1/2O3-35PbMg1/3Nb2/3O3-32PbTiO3 single crystals in an electric field

The influence of different conditions of applying a dc electric field (0 < E < 4 kV/cm) on the behavior of optical transmission and on the acoustic parameters (sound velocity and attenuation) in the 001]- and 011]-oriented single crystals 33Pb(In_1/2Nb_1/2)O₃-35PbMg_1/3Nb_2/3O₃-32PbTiO₃ existing near the morphotropic phase boundary has been investigated. It has been found that the optical transmission, sound velocity, and attenuation sharply change near the phase transition in a narrow range of electric fields for any method of their applying. In the field applied along 001], the change in the sound velocity due to the phase transition is 1.5 times greater than that in the field applied along 011]. This is caused by a larger contribution of the piezoelectric effect to the elastic modulus determining the sound velocity along 001] as compared to 011]. It has been shown that the number, symmetry, and stability of the phases formed in the field depend on the conditions of applying the field.