DONG Mengyun ¹, ZHANG Cheng ¹, JIANG Danyu ², XIA Jinfeng ², NIAN Hongqiang ²
(1. Shanghai Institute of Technology, Shanghai 200235, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences,
Shanghai 200050, China)

Abstract: 5mol%YF₃-CaF₂ nano-power was prepared by direct precipitation method with Ca(NO₃)₂ , Y(NO₃)₃ and KF as raw materials. The influences of pre-sintering temperature and sintering temperature on the particle size and distribution of 5mol%YF₃-CaF₂ nano-power were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that 5mol%YF₃-CaF₂ nano-powder prepared by direct precipitation exhibits calcium fluoride fluorite structure; at the concentration of 5mol%, the doping has not changed CaF₂ cubic phase, and the solid solution is formed; with its average particle size of about 20nm, the 5mol%YF₃-CaF₂ nano-powder has good dispersivity and uniform particle size distribution; the best pre-sintering temperature is 500 ℃ and the best sintering temperature is 900 ℃.
Key words: nano-powder; direct precipitation method; 5mol%YF₃-CaF₂ ceramics