共查询到6条相似文献,搜索用时 0 毫秒
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Qingyuan Hu D.O. Alikin P.S. Zelenovskiy A.D. Ushakov D.S. Chezganov Jihong Bian Ye Zhao Ye Tian Yongyong Zhuang Jinglei Li Li Jin Zhuo Xu Vladimir. Ya. Shur Xiaoyong Wei 《Journal of the European Ceramic Society》2019,39(14):4131-4138
Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) single crystals exhibit ultrahigh piezoelectric property and have already been applied in various industrial fields. Here, spatial distribution of coexistent phases and corresponding local piezoelectric responses in a morphotropic phase boundary (MPB) PMN-xPT single crystal are thoroughly investigated by confocal Raman spectroscopy coupled with piezo-response force microscopy (PFM). Different from previous studies on MPB crystals, spatial distribution of coexistent phases is exhibited intuitively in an image obtained by confocal Raman mapping. Via in-situ PFM measurements, domain morphology of each coexistent phase is observed. Moreover, local piezoelectric responses of each coexistent phase are obtained by switching spectroscopy PFM measurements, indicating that Ma and Mc phases behave like PNRs and polar matrix in PMN-xPT crystals Our work clarifies the contribution from different phases to the giant piezoelectric performance, which can deepen the understanding on the ultrahigh piezoelectricity in PMN-xPT crystals and provide the key point for developing novel high piezoelectricity materials. 相似文献
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Liaodong Ai Xiuzhi Li Zujian Wang Ying Liu Chao He Tao Li Tao Chu Dongfang Pang Hamel Tailor Xifa Long 《Journal of the European Ceramic Society》2013,33(11):2155-2165
Ceramics of the xPb(Zn1/3Nb2/3)O3–(1 ? x ? y)Pb(Yb1/2Nb1/2)O3–yPbTiO3 (PZN–PYN–PT) ternary system were synthesized using a modified two-step columbite precursor method which can effectively suppress the pyrochlore phase. A morphotropic phase boundary (MPB) region, separating tetragonal and rhombohedral phases in the ternary systems has been determined. The electric properties of the compositions near MPB region were investigated. Dielectric response exhibits relaxor-like characteristics with broad dielectric peaks and dispersive dielectric behavior with respect to frequency and temperature. The phase diagram of the 0.45PZN–(0.55 ? y)PYN–yPT pseudo-binary system in the composition range of 0.15 < y < 0.35 was established based on dielectric measurements. The optimal properties were achieved in the MPB composition of 0.52PZN–0.21PYN–0.27PT with piezoelectric coefficient d33, dielectric permittivity ε′, planar electromechanical coupling kp, dielectric loss tan δ, coercive field Ec, remnant polarization Pr, and TC being of 558 pC/N, 2065, 62%, 0.2%, 19.88 kV/cm, 31.44 μC/cm2 and 259.5 °C, respectively, showing potential usage in high-temperature electromechanical applications. 相似文献
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《Ceramics International》2015,41(8):9344-9349
Relaxor ferroelectric Pb[(Ni1/3Nb2/3)0.6Ti0.4]O3 (PNNT) single crystal with composition close to the morphotropic phase boundary (MPB) was successfully prepared using the molten salt method. The analysis results of XRD and TEM indicated that the as-grown crystal is of almost pure perovskite phase with coexistence of tetragonal and rhombohedral. Typical relaxor behavior was observed when the crystal was aged. Large electrocaloric strength (ΔT/ΔE) of 44.97 mK cm/kV was obtained near the phase transition temperature of paraelectric to ferroelectric, indicating that PNNT is a promising material for application in cooling system. Moreover, it is found that the aging of point defects may make an important contribution to the electrocaloric performance of the single crystal, in addition to the contribution of the transition of phases induced by the electric field. 相似文献
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Anisotropic domain structures of Pb(Mg1/3Nb2/3)O3–PbZrO3–PbTiO3 single crystals with high ferroelectric phase transition temperature
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Wenhui He Tong Jiang Qiang Li Xiaoqing Xi Qingfeng Yan 《Journal of the American Ceramic Society》2017,100(4):1724-1732
The anisotropic domain structures and local piezoresponse of rhombohedral Pb(Mg1/3Nb2/3)O3–PbZrO3–PbTiO3 single crystals with high ferroelectric phase transition temperature (TFE‐FE≥120°C) were systematically investigated by vector piezoresponse force microscopy. The typical size of labyrinthine domain pattern for [001]C sample was in the range of 100‐200 nm, revealing its relaxor feature. While the [011]C sample exhibited ordered ribbon‐shaped domain pattern with preferential alignment along <011> direction since the modulation effect of polar nanoregions. For [111]C sample, it had messy and featureless domain patterns. For as‐grown crystal, the incorporation of Zr4+ cation in Pb(Mg1/3Nb2/3)O3–PbTiO3 system resulted in that the long‐range coulomb interactions of the charged ions in the short range order regions were weakened, leading to an increased relaxor feature. Concurrently, the incorporation of Zr4+ cation enhanced the Pb‐B repulsion intensity, resulting in an improved TFE‐FE. Temperature‐dependent properties of as‐grown crystal exhibited good temperature stability from 30 to 120°C, indicating it is a promising material for actuator and ultrasonic transducer applications. 相似文献
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Zongmo Shi Feng Gao Jie Xu Jihong Zhu Yi Zhang Tong Gao Mengjie Qin Mike Reece Haixue Yan 《Journal of the European Ceramic Society》2019,39(10):3088-3093
A two–step processing method, spark plasma sintering (SPS) combined with a heat–treatment, was used to fabricate (Ca0.9Ag0.1)3Co4O9/nano–sized Ag composites. Sliver within the lattice generated hole carriers, and silver along the grain boundaries improved the transport path of the charge carriers. Samples sintered using SPS at different temperatures had very different thermoelectric properties. The results showed that when the sample was sintered at 1233 K, the maximum power factor reached 0.43 mW/(m·K2) along with an electrical resistivity of 8.61 mΩ·cm and a Seebeck coefficient of 196.90 μV/K, and the corresponding lattice thermal conductivity was 1.86 W/(m·K). This study shows how to improve the properties and broaden the application of Ca3Co4O9 thermoelectric ceramics. 相似文献