Solid Solutions in Antiferroelectric Region of the System PbHfO 3 ‐PbTiO 3 ‐PbSnO 3 ‐PbNO 2 O 6

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Abstract
Dielectric, ferroelectric, and piezoelectric properties were investigated for compositions in the high‐lead hafnate region of the system PbHfO 3 ‐PbTiO 3 ‐PbSnO 3 ‐PbNO 2 O 6 . 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 cm 2 .

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