High-T[sub m] relaxor ferroelectrics: 0.3BiScO[sub 3]–0.6PbTiO[sub 3]–0.1Pb(Mn[sub 1/3]Nb[sub 2/3])O[sub 3].

High-T[sub m] relaxer materials are being developed for high-temperature high-power density electretransductien applications and high-temperature capacitors in automobile applications. A relaxer ferreelectric material of composition 0.3BiScO[sub 3]-0.6PbTiO[sub 3]-0.1Pb(Mn[sub l/3]Nb[sub 2/3]) O[sub 3] having a very high dielectric maximum of ∼350 °C is reported. The relaxer 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 δε/δT= 2.5/°C. The room-temperature magnitude of dielectric constant is ∼600. [ABSTRACT FROM AUTHOR]