Progress in Studies on Fabrication and Properties of PZNT Relaxor Ferroelectrics

Abstract

Abstract: The present paper reviews the recent progress in studies on fabrication and dielectric piezoelectric and electrostrictive properties
of relaxor ferroelectric PZNT. The dominant method of fabrication of PZNT is the PbO flux method at high temperature, by which the single
crystals with size of 40mm have been grown. Studies on their dielectric properties indicated that the behavior of phase transition of PZNT crystals
would vary from diffused, mixed to first order transition type with the increase of PT concentration. The rhombohedral-tetragonal ferroelectric
phase transition is also diffused which can be induced by composition or electric field. Single crystals with their composition at MPB or in the
rhombohedral phase region near MPB have extremely strong piezoelectric properties. The <001> oriented rhombohedral and tetragonal crystals
are respectively suitable for acoustic arrays and single element sensors and actuators with broader bandwidth, improved sensitivity and optimum
impedance matching. Crystallographically, high strains are achieved for <001> oriented rhombohedral crystals and their levels reach an order of
magnitude of those available from conventional piezoelectric and electrostrictive ceramics such as PZT series and PMNT ceramics, which make these crystals
as promising candidates for high performance solid actuators.

Key words: PZNT, single crystals, piezoelectric properties, electrostrictive strains

CLC Number:

TM22

XU Gui-Sheng,LUO Hao-Su,QI Zhen-Yi,XU Hat-Qing,YIN Zhi-Wen. Progress in Studies on Fabrication and Properties of PZNT Relaxor Ferroelectrics[J]. Journal of Inorganic Materials.

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