Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 109: Issue 2
On the influence of the milling time in the Curie temperature of Fe56Co7Ni7Zr10B20 investigated by magnetic thermogravimetric analysis
Authors:
G. F. Barbosa Departamento de Física, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil
Graduate Program in Material Science, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil

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F. L. A. Machado Departamento de Física, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil

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A. R. Rodrigues Departamento de Física, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil

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W. M. Azevedo Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil

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Pages:
825–829
Online Publication Date:
19 Jul 2011
Publication Date:
01 Aug 2012
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-011-1791-3
Keywords:
Magnetic thermogravimetry; Nanocrystalline; Amorphous; Magnetic materials
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Abstract

Magnetic thermogravimetric analysis (TGM) was used to investigate the influence of the milling time (tmill) in the Curie temperature (TC) of nanocrystalline powders and of a melt-spun amorphous ribbon with composition Fe56Co7Ni7Zr10B20. The TGM analysis was carried in a continuous flow of 99.99% pure argon from room temperature up to 1250 K. A magnetic field of 100 Oe was applied throughout the measurements. Nanopowders of Fe56Co7Ni7Zr10B20 were produced by mechanical alloying the samples in an argon atmosphere for milling times ranging from 1 to 100 h. The samples were characterized by X-ray diffraction and by scanning electron microscopy. The average particle size decreased from 45.4 nm for a powder milled for 1 h to 5 nm after being milled for 100 h. Moreover, TC (=1126.4 ± 4.4 K) was found to be nearly independent of tmill while for the melt-spun amorphous ribbon it was found to be substantially smaller (TC = 482 K). This is a clear indication that TC is quite sensitive to the degree of amorphosity present in the sample. The activation energy associated to the crystallization process was estimated from DSC data by using the Kissinger's method to be 193 kJ/mol.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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