标题：Fabrication of dense (K, Na)NbO3ceramics by modified two-step sintering
作者：Zhang, J.L. ;Gao, Y.
作者机构：[Zhang, J.L. ;Gao, Y. ] School of Physics, State Key Laboratories of Crystal Materials, Shandong University, Jinan; 250100, China
来源：Materials Research Innovations
摘要：Achieving a high relativity density value in the (K, Na)NbO3based ceramics is usually quite difficult due to the volatility of alkali elements. A modified two-step sintering technique has been attempted to conveniently fabricate the dense (K, Na)NbO3based ceramics through the solid state reaction route in this work. The chemical composition (K0.50Na0.50)NbO3was chosen as the test example. As the result, the obtained ceramic shows the much improved microstructure with a relative density value of 97.1% and comparatively uniform grain size distribution, thus differs largely from the corresponding one densified by conventional sintering. Meanwhile, a considerable increase in the piezoelectric constant d33(from 125 to 143 pC N-1) is also observed. Therefore, modified two-step sintering is considered as an effective means for fabricating the dense KNN based lead-free piezoelectric ceramics.
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