Dielectric and electret properties of bismuth titanate ferroelectric ceramics with compensated conductivity

Abstract

The introduction of tungsten and niobium oxides into pure bismuth titanate allows one to reduce dielectric losses and the conductivity down to 10⁻¹⁰ S/m, to raise the permittivity up to 170, and to stabilize piezoelectric properties. The thermos lectret state becomes stable - in 6 years after polarization the surface density of the charge was 26 μC/m².