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β-Si3N4 Microcrystals Prepared by Carbothermal Reduction-Nitridation of Quartz

机译：石英碳热还原氮化法制备的β-Si3N4微晶

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摘要

Single phase β-Si N 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, Fe O additive and β-Si N 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 Si N in the products, we synthesized powders of β-Si N single polymorph in this work. The mechanism for the CRN synthesis of β-Si N from quartz and the formation mechanism of Fe Si droplets were discussed. We also firstly reported the formation of Fe Si Archimedean solids from a CRN process where Fe O was introduced as additive. Comparing to the gear-like short columnar morphology observed in samples without β-Si N seeding, the addition of β-Si N seeds led to an elongated morphology of final products and much finer widths. In addition, the β-Si N microcrystals exhibited a violet‒blue spectral emission range, which could be highly valuable for their future potential optoelectronic applications.
机译：以石英和碳焦粉为原料，经碳热还原-氮化（CRN）合成了具有微晶的单相β-SiN。研究和讨论了反应参数，即加热温度，保温时间，C / SiO比，Fe O添加剂和β-SiN晶种对产物的相变和形态的影响。在这项工作中，我们合成了β-SiN单晶型的粉末，而不是在产物中接受Si N的α-相和β-相的混合物。讨论了CRN从石英CRN合成β-SiN的机理和Fe Si液滴的形成机理。我们还首先报道了由CRN工艺形成的Fe Si阿基米德固体，其中引入了Fe O作为添加剂。与在没有β-SiN晶种的样品中观察到的齿轮状短柱状形态相比，添加β-SiN晶种会导致最终产物的形态变长，宽度更细。另外，β-SiN微晶表现出紫‒蓝光谱发射范围，这对于它们未来的潜在光电应用而言可能是非常有价值的。

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