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Polycrystalline sample of (Ba_{0.90}Pb_{0.10})(Ti_{0.90}Sn_{0.10})O_3 wasobtained by means of a conventional ceramic technology. The dielectricmeasurements were performed depending on temperature and frequency of electricmeasuring field. The character of the phase transitions of(Ba_{0.90}Pb_{0.10})(Ti_{0.90}Sn_{0.10})O_3 ceramics strongly depends on thepresence of Pb in the sample. The obtained results pointed out the diffusedcharacter of phase transition. The temperature dependence of the dielectricproperties showed that the phase transition from the paraelectric phase toferroelectric one takes place at the same temperature (T_{m}=367 K). It doesnot depend on the frequency of the measuring electric field. A change of thevalue of the parameter \gamma takes place in the paraelectric phase.

Study of the phase transition in polycrystalline (Ba_{0.90}Pb_{0.10})(Ti_{0.90}Sn_{0.10})O_3