金属磁记录粉表面包覆硅烷偶联剂（KH550）可以明显改善其氧化稳定性.采用TEM,FT-IR TG-DSC,Mossbauer,EXAFS以及VSM等分析方法,研究表面有机物结构以及表面吸附有机薄膜对金属粒子本身原子结构的影响.结果表明,有机物分子一方面与粒子表面氧化层发生较强的化学键合作用形成Si-O-Fe,表面有机物薄膜影响粒子表面Fe原子、电子状态;对粒子基体中Fe原子的第二近邻结构具有明显的影响,而对第一近邻结构没有影响.
The magnetic and chemical stability of α-Fe metal magnetic recording particles can be
modified by chemical surface coating with silane coupling agents. The results of measurements by TEM, FT-IR, TG-DSC, Mossbauer, EXAFS
and VSM etc show that a close, uniform, firm and ultrathin layer, which is benefit for the magnetic and chemical stability, can be formed by the
cross-linked chemical bond Si--O--Si. And the organic molecule has chemically bonded to the particle surface oxide layer with Si--O--Fe, which has greatly
affected the surface electronic structure and the second shell of Fe atom. However, the organic layer really does not affect the first shell of the
matrix Fe atom.
参考文献
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