Chemical Surface Coating of α-Fe Magnetic Particles with Silane Coupling Agent

Abstract

Abstract: 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.

Key words: metal magnetic recording powders, silane coupling agents, chemical surface coating, Mossbauer, EXAFS

CLC Number:

O657

WANG Qi-Xiang,SONG Bao-Zhen,LI Hong-Zhong. Chemical Surface Coating of α-Fe Magnetic Particles with Silane Coupling Agent[J]. Journal of Inorganic Materials.

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