A Novel Calcining Method Used to Fabricate the K0.5Na0.5NbO3 Ceramics

作者：Cheng Ping Shou; Lin Ying Hsun; Chen Wen Ray; Chang Wen Chung; Yang Cheng Fu^*

来源：Ferroelectrics, 2014, 458(1): 221-226.

DOI：10.1080/00150193.2013.850978

• Two-step calcining method
• K0.5Na0.5NbO3 ceramics
• dielectric properties

K0.5Na0.5NbO3 ceramic prepared by a conventional solid-state reaction process (calcinated at 850 degrees C and sintered) is so fragile that it can not be used to measure dielectric properties. In this paper, we use a two-step calcining method to synthesize KNN composition, with a hydrothermal treatment (200 degrees C for 4 hrs) preceding the calcining process (750 degrees C and 850 degrees C for 2 hrs). Following the hydrothermal treatment and calcining the KNN ceramic was sintered at 1100 degrees C approximate to 1160 degrees C. X-ray diffraction patterns for all KNN ceramics showed a perovskite structure with orthorhombic symmetry. The effects of different calcining and sintering temperatures on the properties of the resulting KNN ceramic, including surface morphology and dielectric characteristic, were recorded and analyzed.

• 出版日期2014-1-2