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Low‐Temperature Preparation of K x Na (1− x ) NbO 3 Lead‐Free Piezoelectric Powders by Microwave‐Hydrothermal Synthesis
Author(s) -
Zhang Mei,
Guo Min,
Zhou Yuan
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2009.02464.x
Subject(s) - materials science , crystallinity , hydrothermal circulation , piezoelectricity , crystallization , hydrothermal synthesis , phase (matter) , microwave , transmission electron microscopy , potassium niobate , alkalinity , scanning electron microscope , chemical engineering , morphology (biology) , mineralogy , nanotechnology , composite material , dielectric , ferroelectricity , optoelectronics , chemistry , physics , organic chemistry , quantum mechanics , engineering , genetics , biology
Sodium–potassium–niobate (K x Na (1− x ) NbO 3 ) lead‐free piezoelectric powders were synthesized using the microwave‐hydrothermal method. The effect of different parameters such as temperature, reaction time, and alkalinity of the precursor on the crystalline size and morphology of K x Na (1− x ) NbO 3 was investigated. It has been shown that the K x Na (1− x ) NbO 3 phase forms at 150°C, and K 0.5 Na 0.5 NbO 3 (KNN) powders with perfect crystallinity and a uniform size have been prepared at 160°C for 7 h. Transmission electron microscopy images indicate that the KNN powders are single crystalline. Because of microwave enhancement, the K x Na (1− x ) NbO 3 synthesis has been speeded up, resulting in the crystallization of the K x Na (1− x ) NbO 3 phase at a temperature as low as 150°C.