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Sr_(9-x)PbxCe2Ti12O36 system is derived from the perovskite SrTiO3 and itschemical formula can be written as (Sr_(1-y)Pby)0.75Ce0.167TiO3. Weinvestigated dielectric response of Sr_(9-x)PbxCe2Ti12O36 ceramics (x = 0-9)between 100 Hz and 100 THz at temperatures from 10 to 700 K using low- andhigh-frequency dielectric, microwave (MW), THz and infrared spectroscopy. Werevealed that Sr9Ce2Ti12O36 is an incipient ferroelectric with the R-3ctrigonal structure whose relative permittivity e' increases from 167 at 300 Kand saturates near 240 below 30 K. The subsequent substitution of Sr by Pbenhances e' to several thousands and induces a ferroelectric phase transitionto monoclinic Cc phase for x>=3. Its critical temperature Tc linearly dependson the Pb concentration and reaches 550 K for x=9. The phase transition is ofdisplacive type. The soft mode frequency follows the Barrett formula in sampleswith x<=2 (typical for quantum paraelectrics) and the Cochran formula for x>=3.The MW dispersion is lacking and quality factor Q is high in samples with lowPb concentration, although the permittivity is very high in some cases.However, due to the lattice softening, the temperature coefficient of thepermittivity is rather high. The best MW quality factor was observed for x=1:Q*f=5800 GHz and e'=250. Concluding, the dielectric properties of Sr_(9-x)PbxCe2Ti12O36 are similar to those of Ba_(1-x)SrxTiO3 so that this system canbe presumably used as an alternative for MW devices or capacitors.

Ferroelectric and Incipient Ferroelectric Properties of a Novel Sr_(9-x)PbxCe2Ti2O36 (x=0-9) Ceramic System