High-Tm relaxor materials are being developed for high-temperature high-power density electrotransduction applications and high-temperature capacitors in automobile applications. A relaxor ferroelectric material of composition 0.3BiScO3–0.6PbTiO3–0.1Pb(Mn1/3Nb2/3)O3 having a very high dielectric maximum of ∼350 °C is reported. The relaxor behavior is confirmed by studying polarization relaxation and frequency and temperature dependent dielectric behavior. The dielectric constant in the low-temperature region of 10 °C<T<150 °C is found to be independent of the frequency with a temperature gradient of ∂ε/∂T=2.5/°C. The room-temperature magnitude of dielectric constant is ∼600.

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