BAI Shan ¹ ,ZHANG Fan ¹, KARAKI Tomoaki ² ,ZHAO Xinxin ¹ ,WEN Yuqing ²

(1. School of Materials Science and Engineering, Shenyang Institute of Chemical Technology, Shenyang 110142, China; 2.Department of Intelligent Systems Design Engineering, Faculty of Engineering, Toyama Prefectural University, Imizu,

Toyama 939-0398, Japan)

Abstract: The perovskite type (Ca, K)NbO₃ powders were prepared by hydrothermal method using Nb₂O₅, Ca (OH)₂ and KOH as raw materials. The crystal structure of powders was identified by X-ray powder diffraction (XRD). Energy dispersive X-Ray fluorescence spectrometer (EDX) was carried out to examine the element composition of powders. The morphology and particle size of the powders were observed by scanning electron microscope (SEM). The results show that (Ca, K)NbO₃ powders with a long rod morphology with a 2.0μm length and 0.2μm width can be obtained at 200℃ for 48h in an alkaline solution, in which the concentration of OH^- is 6mol/L. The long rod shaped powders are expected to be the template grains used for tungsten bronze-type Ca₂KNb₅O₁₅ textured ceramics.

Keywords: potassium calcium niobate, hydrothermal method, Ca₂KNb₅O₁₅textured ceramics, template grains