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- W569698712 abstract "The influence of annealing atmosphere on magnetic properties of Fe78.5B13Si8.5 amorphous alloy has been studied. Annealing in N2, Ar, H2 and N2+20%O2 atmospheres improved significantly the iron loss of the rapidly quenched amorphous ribbon, being much better than that after annealing in H2+H2O atmosphere. The purpose of this paper is to make clear the mechanism of this deleterious effect of annealing in a H2O containing atmosphere.According to infrared reflection spectra of the Fe78.5B13Si8.5 amorphous alloy ribbon annealed in the H2+H2O atmosphere, boron in the alloy is found to be oxidized selectively to form B2O3 film with the thickness of several 10 nm on the ribbon surface.Auger electron spectroscopy analysis shows that any depletion zone is not formed on the ribbon surface after annealing in the N2, Ar, H2 and N2+O2 atmospheres. On the other hand, the boron-depletion zone is detected under the oxide film formed during annealing in H2+H2O. The alloy composition in this boron-depletion zone is approximately 0-3 mol%B and 9-11 mol%Si, that suggests a significant decrease of the crystallization temperature.The α-Fe crystalline phase is detected only on the ribbon surface after annealing in the H2+H2O atmosphere by means of thin film X-ray diffraction.We propose the mechanism on the deleterious effect of annealing in the H2+H2O atmosphere that H2O in the atmosphere oxidizes selectively boron in the amorphous alloy to form B2O3 film and the boron-depletion zone, and then the alloy in this zone is crystallized into α-Fe, and this surface crystalline layer induces the perpendicular magnetic anisotropy in the amorphous alloy to deteriorate the iron loss." @default.
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- W569698712 date "1988-01-01" @default.
- W569698712 modified "2023-10-03" @default.
- W569698712 title "Surface Crystallization Induced by the Selective Oxidation of Boron in Fe-B-Si Amorphous Alloy" @default.
- W569698712 cites W2083102141 @default.
- W569698712 doi "https://doi.org/10.2320/jinstmet1952.52.4_420" @default.
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