Magnetic and structural properties of rapidly quenched Nd-Fe-Co-Ge-B alloys / Beitollahi A., Gholamipour R., Marghusian V.K., Andreev S.V., Bogatkin A.N., Duragin S.S., Kozlov A.N., Kudrevatykh N.V., Bogdanov S.G., Pirogov A.N. // Physics of Metals and Metallography. - 2006. - V. 102, l. SUPPL. 1. - P. S24-S31.

ISSN:

0031918X

Type:

Conference Paper

Abstract:

We have studied the structure and magnetic properties of some rapidly quenched and subsequently annealed alloys prepared by centrifugal method with a composition (in wt %) Nd(29.5), Co(6), B(1.1), Ge (x), Fe(balance) with x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0 (wt %) for Ge. Based on X-ray diffraction (XRD), elastic neutron diffraction, and small-angle neutron scattering (SANS), the formation of partially crystallized main hard magnetic 2:14:1 (Φ) phase in the amorphous matrix was detected for all as-spun samples. The size of the clusters formed for the sample with 1 wt % Ge determined based on SANS profiles was about 10 nm. It was shown that the addition of Ge shifts the maximum crystallization peak of the main 2:14:1 phase to higher temperatures. The variation of the magnitudes of different magnetic parameters such as i H c and M s versus Ge concentration for as-spun samples can be possibly related to the different rate of crystallization of the 2:14:1 phase formed. Further, for the samples doped with 0.8 and 1.0 wt % Ge and annealed at 760°C for 5 min the formation of some extra phases such as Nd 5Ge3, NdFe2, NdB4, as well as α-Fe was detected by XRD. The magnetic measurements carried out using a vibrating-sample magnetometer (VSM) for these samples also supported the XRD data obtained. While the highest values of coercivity i H c = 772 kA/m were obtained for the annealed samples without Ge, the highest value of σr = 69 emu/g was also obtained for the samples substituted with 0.8 wt % Ge without an appreciable reduction in i H c. © Nauka/Interperiodica 2006.

Author keywords:

Index keywords:

Annealing; Magnetic properties; Molecular structure; Neutron diffraction; Quenching; X ray diffraction analysis; Amorphous matrix; Crystallization peak; Magnetic measurements; Neodymium alloys

DOI:

10.1134/S0031918X06140067

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Affiliations	Department of Metallurgy and Materials Science, Iran University of Science and Technology, Narmak, Tehran, Iran; Institute of Physics and Applied Mathematics, Ural State University, pr. Lenina 51, Ekaterinburg, 620083, Russian Federation; Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620041, Russian Federation
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Correspondence Address	Beitollahi, A.; Department of Metallurgy and Materials Science, Iran University of Science and Technology, Narmak, Tehran, Iran
Language of Original Document	English
Abbreviated Source Title	Phys. Met. Metallogr.
Source	Scopus