Growth and properties of Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 single crystals directly from melt |
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Authors: | Bijun Fang Haiqing Xu Haosu Luo |
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Institution: | aSchool of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou, Jiangsu 213164, China bThe State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Jiading, Shanghai 201800, China |
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Abstract: | Pb(Zn1/3Nb2/3)0.91Ti0.09]O3 (PZNT91/9) single crystals were grown by a modified Bridgman method directly from melt using an allomeric Pb(Mg1/3Nb2/3)0.69Ti0.31]O3 (PMNT69/31) single crystal as a seed. X-ray diffraction (XRD) measurement confirmed that the as-grown PZNT91/9 single crystals are of pure perovskite structure. Electrical properties and thermal stabilization of PZNT91/9 crystals grown directly from melt exhibit different characters from those of PZNT91/9 crystals grown from flux, although segregation and the variation of chemical composition are not seriously confirmed by X-ray fluorescence analysis (XPS). The 0 0 1]-oriented PZNT91/9 crystals cut from the middle part of the as-grown crystal boules exhibit broad dielectric-response peaks at around 105 °C, accompanied by apparent frequency dispersion. The values of piezoelectric constant d33, remnant polarization Pr, and induced strain are about 1800–2200 pC/N, 38.8 μC/cm2, and 0.3%, respectively, indicating that the quality of PZNT crystals grown directly from melt can be comparable to those of PZNT91/9 single crystals grown from flux. However, further work deserves attention to improve the dielectric properties of PZNT crystals grown directly from melt. Such unusual characterizations of dielectric properties of PZNT crystals grown directly from melt are considered as correlating with defects, microinhomogeneities, and polar regions. |
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Keywords: | A2 Bridgman technique A2 Growth from melt B1 Perovskites B2 Ferroelectric materials B2 Piezoelectric materials |
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