物理化学学报 >> 1995, Vol. 11 >> Issue (10): 886-889.doi: 10.3866/PKU.WHXB19951006

研究论文 上一篇    下一篇

采用红外漫反射光谱研究纳米Si3N4的表面结构

李亚利, 高阳, 梁勇, 郑丰, 肖克沈, 胡壮麒   

  1. 中国科学院金属研究所快递凝固非平衡合金国家实验室;微晶与激光加工研究室,沈阳 110015
  • 收稿日期:1994-11-16 修回日期:1995-03-06 发布日期:1995-10-15
  • 通讯作者: 李亚利

Study of Surfacial Structure of Nano Si3N4 by Fourier Infrared Diffusion Reflection Spectra

Li Ya-Li, Gao Yang, Liang Yong, Zheng Feng, Xiao Ke-Shen, Hu Zhuang-qi   

  1. State Key Laboratory of Rapidly Solidiffied Non-equilibrium Alloys;Micro crystalline and Laser Processing Department,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110015
  • Received:1994-11-16 Revised:1995-03-06 Published:1995-10-15
  • Contact: Li Ya-Li

摘要:

采用付利叶红外漫散反射光谱对激光法制取的具有不同化学组成的纳米Si3N4粉(15-30nm)的表面结构,室温表面氧化及热稳定性进行了研究. 结果表明新鲜的富氮粉体表面主要为硅胺基(Si3-xNHx,x=1-3)结构,粉体暴露空气后硅胺基会与空气中的水分子反应形成硅醇基(SiOH)结构.具有不同组成的粉体随粉中氮含量的增大粒子表面硅胺基量也增加;富硅粉体表面硅胺基较少,其氧化主要为表面硅原子与空气中氧原子形成Si-O键.富氮粉体表面的硅胺基和硅醇基分别在>600℃和>1500℃真空处理条件下消失.

关键词: 付利叶红外光谱, Si3N4, 表面

Abstract:

 The surface structure, ambient oxidation and thermal stability of the lasersynthesized Si3N4 nano powders (15-30nm) with different compositions have been studied by Difusion Reflectin Infrared Fourier Transform (DRIFT) spectra. Results show that the nitrogen rich powders with a freshed surface have silazane structure (Si3-xNHx, x=1-3)and this silazane group reacts with water in the air to form silanol group (Si-OH). The amount of the silazane groups increases with the increase of the nitrogen content in the powders. The silicon rich powders have little silazane on powder surface and the oxidation of the powders occurs by the formation of Si-O bonds from the reaction between the surface Si atoms and the oxygen in the air. The silazane groups and the silanol groups are eliminated from the particle surface upon a vaccum annealing at temperature higher than 600 and 1500℃, respectively.

Key words: Infrared spectra, Si3N4, Surface