将50keV碳离子注入纯Co金属膜中,在剂量为2.5×10~(17)/cm~2时,发现了六方结构碳化物。电子衍射结果表明晶格常数a=0.2685nm,c=0.4335nm。当剂量提高到5×10~(17)/cm~2时,六方衍射环仍然存在。而剂量提高到9×10~(17)/cm~2时,衍射环变成具有非晶特征的漫散晕。Auger谱数据表明,形成的六方相成份范围为Co_2-_3C。本文从固体Fermi能来解释Fe,Co和Ni的六方碳化物形成的变化;从能带理论解释热处理方法形成正交Co碳化物的原因。
The hexagonal Co catbide with lattice parameters α=0.2685 nm and c=0.4335 nm was first found when 50 keV carbon ion implanted in thin Co film at the dose of 2.5×10~(17)/cm~2.The hexagonal diffraction ring can remain still at the dose of 5× 0~(17)/cm~2 and then became haloes at 9×10~(17)/cm~2. The stoichiometric composition of the carbide was identified by Auger spectra as Co_(2-3)C. The explanations were proposed on the behaviour of ferromagnetic carbides along the dearending sequence of Ni-Fe-Co by Fermi energy of solids and on the formation of orthogonal Co carbide under thermal processing by the band theory.
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