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Open AccessArticle

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

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School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi Province, China
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Department of Chemical and Materials Engineering, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(21), 3622; https://doi.org/10.3390/ma12213622
Received: 21 September 2019 / Revised: 26 October 2019 / Accepted: 31 October 2019 / Published: 4 November 2019
Single phase β-Si3N4 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/SiO2 ratio, Fe2O3 additive and β-Si3N4 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 Si3N4 in the products, we synthesized powders of β-Si3N4 single polymorph in this work. The mechanism for the CRN synthesis of β-Si3N4 from quartz and the formation mechanism of Fe3Si droplets were discussed. We also firstly reported the formation of Fe3Si Archimedean solids from a CRN process where Fe2O3 was introduced as additive. Comparing to the gear-like short columnar morphology observed in samples without β-Si3N4 seeding, the addition of β-Si3N4 seeds led to an elongated morphology of final products and much finer widths. In addition, the β-Si3N4 microcrystals exhibited a violet‒blue spectral emission range, which could be highly valuable for their future potential optoelectronic applications. View Full-Text
Keywords: β-Si3N4 microcrystals; Fe3Si archimedean solids; quartz; carbothermal reduction nitridation; seeding β-Si3N4 microcrystals; Fe3Si archimedean solids; quartz; carbothermal reduction nitridation; seeding
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MDPI and ACS Style

Zhang, M.; Chen, Z.; Huang, J.; Huang, S.; Hu, Z.; Feng, Z.; Xiong, Q.; Li, X. β-Si3N4 Microcrystals Prepared by Carbothermal Reduction-Nitridation of Quartz. Materials 2019, 12, 3622.

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