Mossbauer spectroscopy in nanocrystalline materials

Author

Pulido, E. ; Navarro, I. ; Hernando, A.

Author_Institution

Inst. de Magnetismo Aplicado, Univ. Complutense de Madrid, Spain

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2424

Lastpage

2426

Abstract

Amorphous-to-crystalline transformation after isochronal annealing of as-quenched ribbons with the composition of Fe_73.5Si_13.5B₉CuNb₃ has been investigated by Mossbauer spectroscopy. X-ray diffraction, differential scanning calorimetry, and transmission electron microscopy studies were performed to complement the Mossbauer results. The crystallization was found to consist of at least two steps. In the first step, precipitation of Fe-Si alloy (18-20% Si) with DO₃ structure takes place, coexisting with an amorphous phase. In the second step the amorphous phase crystallizes, and Fe₂B is found. The final crystalline products are Fe-Si, Fe-B, and a small amount of nonferromagnetic phase. This nonferromagnetic phase is suggested to be the cause of the magnetic hardening

Keywords

Mossbauer effect; boron alloys; copper alloys; crystallisation; ferromagnetic properties of substances; iron alloys; magnetic properties of amorphous substances; magnetisation; metallic glasses; nanostructured materials; niobium alloys; silicon alloys; DO₃ structure; Fe_73.5Si_13.5B₉CuNb₃; Mossbauer spectroscopy; X-ray diffraction; amorphous-crystalline transformation; as-quenched ribbons; crystallisation; differential scanning calorimetry; isochronal annealing; magnetic hardening; nanocrystalline materials; nonferromagnetic phase; precipitation; transmission electron microscopy studies; Amorphous materials; Annealing; Calorimetry; Crystallization; Iron; Nanostructured materials; Scanning electron microscopy; Spectroscopy; Transmission electron microscopy; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179513

Filename

179513