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采用红外漫反射光谱研究纳米Si3N4的表面结构

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

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【作者】 李亚利高阳梁勇郑丰肖克沈胡壮麒

【Author】 Li Yali; Gdo Yang ;Liang Yong; Zheng Fen; Xiao Kesheng; Hu Zhuangqi(state Key Laboratory of Rapidly solidified Non-equilibrium Alloys; Micro crystalline and Laser Processing Department, Institute of Metal Rescarch, Chinese Academy of Sciences, Shenyang 1

【机构】 中国科学院金属研究所快速凝固非平衡合金国家实验室沈阳微晶与激光加工研究室!110015

【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

【Abstract】 The surface structure, ambient okidation 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 edrinated from the particle surface upon a vaccum annealing at temperature higher than 600 and 1500℃, respectively.

【关键词】 付利叶红外光谱Si3N4表面
【Key words】 Infrared spectraSi3N4Surface
  • 【文献出处】 物理化学学报 ,Acta Physico-chimica Sinica , 编辑部邮箱 ,1995年10期
  • 【分类号】O613.72
  • 【被引频次】2
  • 【下载频次】84
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