The studing material was the multicomponent ceramic of the PZT type: PbZrO₃-PbTiO₃-PbNb_2/3 Mn_1/3O₃-PbW_1/2Mn_1/2O₃. This kind of multicomponent ceramic might be used as high frequency electric converters, piroelectric detectors or useful material in acoustoelectronics as well. This ceramic was obtained by hot pressing method from simple oxides. The studied material was exposed to the external electric field. The field has ordered vectors of polarization inside the material. The polarization conditions were following: temperature of polarization T_pol=(410÷430) K, the external electric field E_pol=(2.5÷3.5) 10⁶ V/m, the polarization time t_pol=1800 s and the environment was the silicon oil (POLSIL OM 500).

The XRD were used for the structure analysis of the non-polarized and polarized samples. The correlation with the crystal structure and ferroelectric domain structure of PbZrO₃-PbTiO₃-PbNb_2/3 Mn_1/3O₃-PbW_1/2Mn_1/2O₃ were analyzed.

This study proves that the high level of the electric field causes to bigger order of 71^o and 109^o domain. According to the increase of the electric field intensity, the value of the crystal lattice deformation increases as well.

The XRD was performed using the Philips X’Pert PW 3040/60 diffractometer with the coopper radiation.

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1. The optimalization of the registration condition for the X-ray reflectivity of real multilayer thin films