Zhang Meng, Chen Zhi, Huang Juntong, Huang Saifang, Hu Zhihui, Feng Zhijun, Xiong Qingming, Li Xibao
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi Province, China.
Department of Chemical and Materials Engineering, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
Materials (Basel). 2019 Nov 4;12(21):3622. doi: 10.3390/ma12213622.
Single phase β-SiN with microcrystals was synthesized via carbothermal reduction-nitridation (CRN) of quartz and carbon coke powder as starting materials. The effects of reaction parameters, i.e., heating temperature, holding time, C/SiO ratio, FeO additive and β-SiN seeds on the phase transformation and morphology of products were investigated and discussed. Rather than receiving a mixture of both α- and β- phases of SiN in the products, we synthesized powders of β-SiN single polymorph in this work. The mechanism for the CRN synthesis of β-SiN from quartz and the formation mechanism of FeSi droplets were discussed. We also firstly reported the formation of FeSi Archimedean solids from a CRN process where FeO was introduced as additive. Comparing to the gear-like short columnar morphology observed in samples without β-SiN seeding, the addition of β-SiN seeds led to an elongated morphology of final products and much finer widths. In addition, the β-SiN microcrystals exhibited a violet‒blue spectral emission range, which could be highly valuable for their future potential optoelectronic applications.
以石英和焦炭粉为原料，通过碳热还原氮化法（CRN）合成了具有微晶的单相β-SiN。研究并讨论了反应参数，即加热温度、保温时间、C/SiO比、FeO添加剂和β-SiN籽晶对产物相变和形貌的影响。在本工作中，我们合成了β-SiN单相多晶型粉末，而不是在产物中得到α-和β-相的混合物。讨论了由石英通过CRN合成β-SiN的机理以及FeSi液滴的形成机理。我们还首次报道了在以FeO为添加剂的CRN过程中形成FeSi阿基米德体。与未添加β-SiN籽晶的样品中观察到的齿轮状短柱状形貌相比，添加β-SiN籽晶导致最终产物的形貌拉长且宽度更细。此外，β-SiN微晶呈现出紫蓝色光谱发射范围，这对于其未来潜在的光电应用可能具有很高的价值。
