Phase transition and piezoelectric properties of (1-x)K0.5Na0.5NbO3-xLiSbO(3) ceramics by hydrothermal powders

作者：Liu Wenlong; Tan Guoqiang^*; Xiong Peng; Xue Xu; Hao Hangfei; Ren Huijun

来源：Journal of Materials Science: Materials in Electronics , 2014, 25(5): 2348-2354.

DOI：10.1007/s10854-014-1886-2

KNbO3, NaNbO3 and LiSbO3 powders were synthesized by a hydrothermal route have been used to prepare (1 - x)K0.5Na0.5NbO3-xLiSbO(3) (KNN-LS; x = 0.00-0.08) ceramics. The effects of LiSbO3 doping on the structures of KNN-LS ceramics have been systematically investigated by X-ray diffraction (XRD) and Rietveld refined XRD patterns. A gradual phase transition from orthogonal to tetragonal with the increase of LiSbO3 content is demonstrated. Thereinto, the monoclinic phase is identified for the KNN-LS ceramic with the LiSbO3 content of x = 0.08. Meanwhile, the XRD pattern reveals that the intensity ratio of (200)/(002) crystal face of the ceramic with x = 0.08 was bigger than one, which is different from the tetragonal phase. The tetragonal phase is revealed in the KNN-LS ceramic in the vicinity of x = 0.07, accompanying with relatively higher piezoelectric and ferroelectric properties. Tetragonal phase is beneficial to improve the piezoelectric properties of the KNN-LS ceramics.

• 出版日期2014-5
• 单位陕西科技大学