Study on Microwave-assisted Hydrothermal Synthesis and the Properties of KNbO3 Powders

doi:10.3724/SP.J.1077.2011.10925

Abstract

Abstract: KNbO₃powders with different phases and morphologies were successfully synthesized through the reaction between KOH and Nb₂O₅by microwave-assisted hydrothermal method at 200℃. Pure KNbO₃ crystals were obtained when the concentration of KOH was maintained from 10mol/L to 14mol/L. According to the XRD, FESEM and TEM characterizations, it could be observed that as increasing the concentration of KOH from 10mol/L to 15mol/L, the KNbO₃ phases changed from rhombohedral to orthorhombic then to tetragonal, and the corresponding morphology of the KNbO₃ powders changed from pyramid-like to rod-like then to cubic-like. Some Nb₂O₅phases were found when the concentration of KOH increased to 15mol/L. KNbO₃ceramics were sintered from the KNbO₃powders by conventional processing. The piezoeletric properties such as the piezoeletric constant d₃₃, the relative permittivity ε₃₃/ε₀, the dielectric loss tanδ, the electromechanical coupling factors kp and the mechanical quality factor Q_m of the sintered KNbO₃ ceramics were 80 pC/N, 302, 0.023, 0.17, 70, respectively. The tetragonal to orthorhombic and cubic to tetragonal phase transitions temperatures were 223℃ and 420℃, respectively.

Key words: KNbO₃, microwave-assisted hydrothermal synthesis, piezoelectric, dielectric

CLC Number:

TQ171

QIN Bo, TAN Guo-Qiang, MIAO Hong-Yan, XIA Ao, CHENG Lei. Study on Microwave-assisted Hydrothermal Synthesis and the Properties of KNbO₃ Powders[J]. Journal of Inorganic Materials, 2011, 26(8): 892-896.

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Study on Microwave-assisted Hydrothermal Synthesis and the Properties of KNbO₃ Powders

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