NDLI: Microstructure and Magnetic Entropy Change in Amorphous <inline-formula> <tex-math notation=TeX>${rm Fe}_{76}{rm Mo}_{10}{rm Cu}_{1}{rm B}

Content Provider	IEEE Xplore Digital Library
Author	Swierczek, J. Hasiak, M.
Copyright Year	1965
Abstract	Microstructure and some thermomagnetic properties of the amorphous Fe₇₆Mo₁₀Cu₁B₁₃ alloy in the as-quenched state and after annealing at 623 and 673 K are studied. High-resolution electron microscopy, apart from the amorphous phase, reveals the existence of medium range ordered (MRO) regions 1-2 nm in size. Transmission Mössbauer spectroscopy confirms that these regions are α-Fe MRO ones and grow during annealing. The Curie point of the alloy is 277, 272, and 284 K in the as-quenched state and after mentioned above heat treatments, respectively. The maximum of the magnetic entropy change is rather modest and equal to 0.88 J · kg^-1· K^-1 in the as-quenched state and reaches the value of 1.12 J · kg^-1 · K^-1 after annealing at 673 K. Magnetic entropy change depends not only on the temperature, but on the maximum of the magnetizing flux density, Bm = μ₀H_m (according to ASM = C(T) · Bnm) as well. The exponent n is close to 1 below the Curie point and does not reach 2 in high and equal to 2 in low magnetizing flux density range above the Curie point like in Curie-Weiss paramagnets. Such behavior is ascribed to the presence of MRO regions beside the amorphous phase and the material can be treated as biphasic.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	1458644
File Format	PDF
ISSN	00189464
Volume Number	50
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Amorphous magnetic materials Metals Annealing Soft magnetic materials Saturation magnetization Magnetization Temperature measurement Mössbauer spectroscopy magnetic entropy magnetization processes
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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