电弧放电等离子体法合成立方相氮化铬纳米粉

Synthesis of Cubic Chromium Nitride Nanocrystals Powders by Arc Discharge Plasma Method

采用电弧放电等离子体方法,通过金属铬和氮气的直接反应合成了粒度小于10nm的纯立方相氮化铬（CrN）纳米粉.利用X射线衍射分析（XRD）、透射电镜（TEM）和傅立叶变换红外光谱（FT-IR）对不同氮气压下形成的产物进行了表征.研究了氮气压和氨气的加入对形成立方相CrN纳米晶的影响.研究结果表明：相对较低的N2气压（5~20kPa）有利于金属Cr向立方CrN的转化,可以使更多的氮原子结合到金属Cr的格子中去;活性氮源（氨气）的加入降低了金属Cr的氮化.

Cubic CrN nanoparticles with the size less than 10 nm were synthesized through direct reaction of metal Cr with N2 by arc discharge plasma method.The products synthesized under different nitrogen gas pressure were characterized by X-ray diffraction（XRD）,transmission electron microscope（TEM） and Fourier transform infrared spectra（FT-IR）.The effect of N2 pressure and accession of NH3 on the formation of cubic phase CrN were studied.The results indicate that it is beneficial for the convesion of Cr to CrN under relative low N2 pressure（5-20kPa）,namely more N atoms can diffuse into Cr lattice.Moreover,the accession of active nitrogen resource（NH3） weakens the nitridation of Cr.