Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (10): 1503-1507.doi: 10.1016/S1872-1508(07)60075-8

• ARTICLE • Previous Articles     Next Articles

Effects of the Reaction Conditions in Preparation of Si3N4 Nanowires

WANG Feng; HAO Ya-Juan; JIN Guo-Qiang; GUO Xiang-Yun   

  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:2007-05-11 Revised:2007-07-03 Published:2007-10-01
  • Contact: GUO Xiang-Yun

Abstract: 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 SiOx2N2O→Si3N4. In the presence of metals, Si3N4 nanowires were produced with the help of the vapor-liquid-solid mechanism

Key words: Si3N4 nanowires, Sol-gel synthesis, X-ray diffraction, Vapor-liquid-solid mechanism


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