Some structural aspects of magnetic property evolution in finemet-type sensor material during amorphous-nanocrystalline transformations

A. Cziráki, Oliv́er Udvardy, Antal Lovas, G. Tichy

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6 Citations (Scopus)

Abstract

Devitrification of glassy Fe73.5Si13.5B 9Nb3Cu1 alloy used as potential sensor material was followed by magnetic measurements and X-ray diffraction, and transmission electron microscopy. It was found, that the permeability, and the coercive field of the alloy changed well below the crystallisation onset, showing a remarkable increase, which was attributed to the structural relaxation and a heterogen nucleation of iron rich phase on Cu clusters. On the basis of lattice parameter measurements the iron rich clusters were depleted from Si atoms during the nucleation process and the Si atoms built in them only during annealing at higher temperatures as 500 °C and 540 °C forming a DO3 structure. From the structural study of samples annealed near to the optimal transformation stage it was concluded, that size distribution of the bcc-Fe(Si) nanocrystallites (not exclusive factor) was only one of the most important factors to achieve the optimal soft magnetic properties, but at the same time, their volume fraction, as well as the degree of ordering in DO3 structure did also contribute to the property optimization. The average grain size produced by laser pulse heat treatment was nearly the same, as that obtained during the traditional heat treatments.

Original languageEnglish
Pages (from-to)167-176
Number of pages10
JournalPeriodica Polytechnica Transportation Engineering
Volume33
Issue number1-2
Publication statusPublished - 2005

Fingerprint

Heat Treatment
Magnetic Properties
Nucleation
Iron
heat
Magnetic properties
Heat treatment
Magnetic Measurements
Sensor
Atoms
Nanocrystallites
Structural relaxation
permeability
Sensors
Magnetic variables measurement
Grain Size
Transmission Electron Microscopy
Crystallization
Annealing
X-ray Diffraction

Keywords

  • Amorphous-nanocrystalline transformation
  • Laser pulse heat treatment
  • Sensor material

ASJC Scopus subject areas

  • Transportation

Cite this

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AU - Cziráki, A.

AU - Udvardy, Oliv́er

AU - Lovas, Antal

AU - Tichy, G.

PY - 2005

Y1 - 2005

N2 - Devitrification of glassy Fe73.5Si13.5B 9Nb3Cu1 alloy used as potential sensor material was followed by magnetic measurements and X-ray diffraction, and transmission electron microscopy. It was found, that the permeability, and the coercive field of the alloy changed well below the crystallisation onset, showing a remarkable increase, which was attributed to the structural relaxation and a heterogen nucleation of iron rich phase on Cu clusters. On the basis of lattice parameter measurements the iron rich clusters were depleted from Si atoms during the nucleation process and the Si atoms built in them only during annealing at higher temperatures as 500 °C and 540 °C forming a DO3 structure. From the structural study of samples annealed near to the optimal transformation stage it was concluded, that size distribution of the bcc-Fe(Si) nanocrystallites (not exclusive factor) was only one of the most important factors to achieve the optimal soft magnetic properties, but at the same time, their volume fraction, as well as the degree of ordering in DO3 structure did also contribute to the property optimization. The average grain size produced by laser pulse heat treatment was nearly the same, as that obtained during the traditional heat treatments.

AB - Devitrification of glassy Fe73.5Si13.5B 9Nb3Cu1 alloy used as potential sensor material was followed by magnetic measurements and X-ray diffraction, and transmission electron microscopy. It was found, that the permeability, and the coercive field of the alloy changed well below the crystallisation onset, showing a remarkable increase, which was attributed to the structural relaxation and a heterogen nucleation of iron rich phase on Cu clusters. On the basis of lattice parameter measurements the iron rich clusters were depleted from Si atoms during the nucleation process and the Si atoms built in them only during annealing at higher temperatures as 500 °C and 540 °C forming a DO3 structure. From the structural study of samples annealed near to the optimal transformation stage it was concluded, that size distribution of the bcc-Fe(Si) nanocrystallites (not exclusive factor) was only one of the most important factors to achieve the optimal soft magnetic properties, but at the same time, their volume fraction, as well as the degree of ordering in DO3 structure did also contribute to the property optimization. The average grain size produced by laser pulse heat treatment was nearly the same, as that obtained during the traditional heat treatments.

KW - Amorphous-nanocrystalline transformation

KW - Laser pulse heat treatment

KW - Sensor material

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