Lan Yu, Li Xiaomin, Luo Jinpeng, Zhou Lang, Wei Xiuqin, Yin Chuanqiang
Institute of Photovoltaics, Nanchang University, Nanchang 330031, China.
Materials (Basel). 2019 Sep 5;12(18):2870. doi: 10.3390/ma12182870.
In this work, the quasi-spherical β-SiN powders were synthesized via an efficient direct nitridation strategy with CaF as the catalytic material under NH atmosphere. The effect of CaF on phase composition and crystalline morphology was studied. CaF additive can accelerate the nitridation of silicon powders, and the particles of nitridation products tend to have an equiaxed structure with the CaF additive increasing. When 4 wt% CaF additive or more was added, submicron β-SiN particles with quasi-spherical morphology and eminent crystal integrity were obtained. In contrast, irregular α-SiN particles appear as the main phase with less than 4 wt% CaF additive. The growth mechanism of SiN particles was also discussed. CaxSiyOz liquid phase is crucial in the nitridation of silicon powders with CaF additive.
在本工作中，以CaF作为催化材料，通过一种高效的直接氮化策略在NH气氛下合成了准球形β-SiN粉末。研究了CaF对相组成和晶体形态的影响。CaF添加剂可以加速硅粉的氮化，随着CaF添加剂含量的增加，氮化产物颗粒倾向于具有等轴结构。当添加4 wt%或更多的CaF添加剂时，可获得具有准球形形态和优异晶体完整性的亚微米β-SiN颗粒。相比之下，当CaF添加剂含量低于4 wt%时，不规则的α-SiN颗粒成为主要相。还讨论了SiN颗粒的生长机制。CaxSiyOz液相在含CaF添加剂的硅粉氮化过程中至关重要。
