A Mössbauer study of ball-milled CoFeSiB: II: with surfactants

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Abstract

The use of a range of organic surface active substances in the ball milling of CoFeSiB has been studied by X-ray diffraction and Mössbauer effect measurements. Effects characteristic of superparamagnetic relaxation of the magnetic moments are observed in the Mössbauer spectra of samples milled with either an anionic or a cationic surfactant. This behaviour is linked with the decreased particle size and high shape homogeneity of surfactant-aided milled samples compared with the amorphous powders resulting from standard dry milling. Impurity iron-oxide phases are also found to occur in samples milled in the presence of surfactants.

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1

Present address: BHP Research Laboratories — Melbourne Laboratories, Clayton, Victoria 3168, Austalia.

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