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Crystals 2015, 5(2), 172-192; doi:10.3390/cryst5020172

The Growth and Properties of Lead-Free Ferroelectric Single Crystals

Key Laboratory of Inorganic Functional Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 215 Chengbei Road Jiading, Shanghai 201800, China
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Author to whom correspondence should be addressed.
Academic Editor: Shujun Zhang
Received: 30 April 2014 / Accepted: 15 September 2014 / Published: 25 March 2015
(This article belongs to the Special Issue Piezoelectric Crystals)

Abstract

Much attention is drawn to the preparation, structure and properties investigation of lead-free ferroelectrics for the next generation of piezoelectric devices. (Na0.5Bi0.5)TiO3-BaTiO3 (NBT-BT) lead-free solid solution piezoelectric single crystals with composition x in the range of 0–0.05 as a materials with high piezoelectric properties were successfully grown from platinum crucible by using the top-seeded solution growth (TSSG) method. The dimensions of NBT-BT crystal is Ø40 × 10 mm2. X-ray powder diffraction patterns reveal that the crystal structure of NBT-BT crystal changes from rhombohedral to tetragonal symmetry with increasing amounts of BT(x). The dielectric, ferroelectric and piezoelectric properties of NBT-BT crystals with different compositions near the morphotropic phase boundary (MPB) were studied systematically. Ions (Mn, Eu, Zn) doped NBT and NBT-BT 95/5 crystals were also grown and studied. In addition, their piezoelectric and ferroelectric properties are investigated. Further, a high-quality and large-sized (K0.25Na0.75)NbO3 (KNN25/75) single crystal has been achieved by a carefully controlled TSSG method. The dimensions of the as-grown KNN25/75 single crystal reached up to Ø30 × 10 mm2. The obtained KNN crystals provided us a superb material for the dielectric, piezoelectric, ferroelectric and electromechanical coupling property characterization along different orientations. View Full-Text
Keywords: lead-free ferroelectrics; crystal growth; piezoelectric performance; ferroelectric performance; ion doping lead-free ferroelectrics; crystal growth; piezoelectric performance; ferroelectric performance; ion doping
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, X.; Chen, C.; Deng, H.; Zhang, H.; Lin, D.; Zhao, X.; Luo, H. The Growth and Properties of Lead-Free Ferroelectric Single Crystals. Crystals 2015, 5, 172-192.

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