[Zurück]

R. Andrejco, P. Vojtanik, R. Varga, H. Sassik, R. Grössinger:
"Structural and magnetic stability of an amorphous Fe-based alloy with a wide supercooled liquid region";
Phys. Stat. Sol., 7 (2004), S. 1463 - 1470.

Structural and magnetic stability of an amorphous Fe-based alloy with a wide supercooled liquid region
R. Andrejco 1, P. Vojtanik 1 *, R. Varga 1, H. Sassik 2, R. Grössinger 2
1Institute of Physics, Faculty of Sciences, P. J. afárik University, Park Angelinum 9, 041 54 Koice, Slovakia
2Institute of Solid State Physics, TU Wien, Wiedner Hauptstr. 8-10, 1040 Wien, Austria
email: P. Vojtanik (vojtanik@upjs.sk) R. Grössinger (rgroess@phys.tuwien.ac.at)

*Correspondence to P. Vojtanik, Phone: +421 55 62 211 28, Fax: +421 55 62 221 24

Keywords
75.50.Bb . 75.50.Kj . 75.60.Lr . 81.40.Ef

Abstract
The magnetic after-effect of initial reluctivity in an amorphous Fe73Al5Ga2P10C5B4Si1 alloy has been investigated by isochronal as well as isothermal measurements. The relaxation intensity is lower than in simpler Fe-based amorphous alloys prepared by rapid quenching methods. This is produced by reduced free volume quenched within the sample during manufacturing and by strong chemical bonds between metalloid atoms and atoms improving the glass-forming ability of the alloy. Changes of pre-exponential factor indicate large changes of amorphous structure after different heat treatments. Different relaxation mechanisms are identified in the samples, reorientation of atom pair axes and short-range metalloid migrations leading to homogenization of the structure and reduction of the free volumes. The most probable activation energy Q* and pre-exponential factor 0 are lowest for as-prepared samples: Q* = 1.42 eV and 0 = 3 × 10-16 s. Both these quantities increase after annealing and slow cooling to Q* = 1.79 eV and 0 = 2 × 10-15 s. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04970111

http://www3.interscience.wiley.com/cgi-bin/abstract/108564043/ABSTRACT