Solid Solutions in Antiferroelectric Region of the System PbHfO3-PbTiO3-PbSnO3-PbNO2O6

Dielectric, ferroelectric, and piezoelectric properties were investigated for compositions in the high-lead hafnate region of the system PbHfO₃-PbTiO₃-PbSnO₃-PbNO₂O₆. Phase diagrams were prepared that show the existence of a ferroelectric-to-antiferroelectric phase transition with increasing temperature. Five phases were shown to exist in the portion of the system investigated two ferroelectric phases, two antiferroelectric phases, and one paraelectric phase. Ferroelectric-antiferroelectric phase transitions induced by temperature, electric field, and pressure were investigated. The highest spontaneous polarization measured was approximately 25 μcoul per cm².