Review on Preparation and Properties of the Relaxor Ferroelectric Single Crystals and Textured Ceramics
ZHAO Li-li, TANG Bin, ZHAO Ming, FAN Hui-qing, TIAN Chang-sheng ( College of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China; Department of Electronics, Northwest University, Xi'an 710069, China)
Preparation and electrical properties of the relaxor ferroelectric crystals and textured Pb (Mg1/3Nb2/3)O3-PbTiO3 (PMNT) ceramics are reviewed. Most of the single crystals are prepared by high-temperature solution growth, Bridgman method or solid recrystallization method. The properties depend on the single crystals' directions very strongly, and (001) sliced crystals have the best piezoelectric properties. Now the single crystals with size of more than 40mm have been reported. But misdistribution of components is main factor to affect the piezoelectric properties of materials. However, [001 ] -textured PMNT ceramics have showed excellent piezoelectric properties, which can be prepared by TGG (or RTGG) method. The preparation of this kind of the ceramics requires low cost and less time, whose piezoelectric constant d33 can obtain 60%-80% that of the single crystal. Moreover, the dielectric permittivity of textured PMNT ceramics is relatively higher than that of the single crystals prepared by solid recrystallization method. Therefore, the preparation of grain oriented textured ceramics shows high promising trend in application.
【CateGory Index】： TM221