Polycrystalline sample of (Ba_{0.90}Pb_{0.10})(Ti_{0.90}Sn_{0.10})O_3 was
obtained by means of a conventional ceramic technology. The dielectric
measurements were performed depending on temperature and frequency of electric
measuring 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 the
presence of Pb in the sample. The obtained results pointed out the diffused
character of phase transition. The temperature dependence of the dielectric
properties showed that the phase transition from the paraelectric phase to
ferroelectric one takes place at the same temperature (T_{m}=367 K). It does
not depend on the frequency of the measuring electric field. A change of the
value of the parameter \gamma takes place in the paraelectric phase.Comment: 5 pages, 6 figure
