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Citation: WANG Feng, HAO Ya-Juan, JIN Guo-Qiang, GUO Xiang-Yun. Effects of the Reaction Conditions in Preparation of Si₃N₄ Nanowires[J]. Acta Physico-Chimica Sinica, ;2007, 23(10): 1503-1507. doi: 10.1016/S1872-1508(07)60075-8 shu

Effects of the Reaction Conditions in Preparation of Si₃N₄ Nanowires

1.
Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China; College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China

Received Date: 11 May 2007
Available Online: 23 August 2007

X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study the effects of reaction conditions (catalysts, reaction temperature and time) on the crystalline phases and morphologies of the carbothermal reaction products in the sol-gel synthesis of Si₃N₄ nanowires. The results showed that Si₃N₄ nanowires could be obtained with high yield by using xerogel, which produced a mixture with 5%(w) Fe after carbonization, with a controlling reaction temperature and time of 1300 ℃ and 10 h, respectively. The products obtained by using different additives had different crystalline phases. The content of additives also influenced the morphologies of the products. With increasing the reaction temperature or extending the reaction time, the products underwent a phase transformationof SiO_x2N₂O→Si₃N₄. In the presence of metals, Si₃N₄ nanowires were produced with the help of the vapor-liquid-solid mechanism
- Si₃N₄ nanowires; Sol-gel synthesis; X-ray diffraction; Vapor-liquid-solid mechanism
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沈阳化工大学材料科学与工程学院沈阳 110142

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Effects of the Reaction Conditions in Preparation of Si₃N₄ Nanowires