Irradiation-induced amorphized state of rapidly quenched R 12Fe 82B 6 alloys (R = Nd, Er) / Teplykh A.E., Chukalkin Yu.G., Bogdanov S.G., Skryabin Yu.N., Kudrevatykh N.V., Andreev S.V., Volegov A.S., Kozlov A.I., Choi Y., Pirogov A.N. // Physics of Metals and Metallography. - 2012. - V. 113, l. 6. - P. 566-574.

ISSN:

0031918X

Type:

Article

Abstract:

Rapidly quenched (RQ) alloys R 12Fe 82B 6 (R = Nd, Er) have been prepared by melt spinning. Their magnetic properties, structure, and phase composition have been studied before and after fast-neutron irradiation to a fluence of 1.2 × 10 20 n/cm 2. Before irradiation, it is the Nd 2Fe 14B-type phase (space group P4 2/mnm) that is mainly present in the RQ alloys at 295 K. In the Nd 12Fe 82B 6 alloy, this phase has a ferro- magnetic structure with magnetic moments at the Nd and Fe atoms oriented parallel to the c axis; the Er 2Fe 14B phase found in the Er12Fe82B6 alloy is characterized by a ferrimagnetic order of Er and Fe magnetic moments parallel to the basal plane. After irradiation, the crystalline state of both RQ alloys transforms into an amorphous state. The ferro- and ferrimagnetic orders are retained in them, but the Curie temperature of the alloys with Nd and Er decreases by 100 and 200 K, respectively. The spontaneous magnetization of the irradiated alloys at 5 K is approximately equal to their magnetization in the crystalline state, whereas their coercive force is lower than that for the alloys before irradiation by two orders of magnitude. The effects observed are explained by the dispersion of Fe-Fe exchange interactions resulting from the dispersion of interatomic spacings in the amorphous alloys. © Pleiades Publishing, Ltd., 2012.

Author keywords:

Fast-neutron irradiation; Ferrimagnetic order; Ferromagnetic order; Neutron diffraction; Permanent magnets

Index keywords:

Amorphous state; B phase; Basal planes; Crystalline state; Fe atoms; Ferrimagnetic order; Ferromagnetic orders; Fluences; Interatomic spacing; Orders of magnitude; Space Groups; Spontaneous magnetizat

DOI:

10.1134/S0031918X12060105

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84863697709&doi=10.1134%2fS0031918X12060105&partnerID=40&md5=bf5f28fe6159100fbc6f94b66386f3d7

Соавторы в МНС:

Другие поля

Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84863697709&doi=10.1134%2fS0031918X12060105&partnerID=40&md5=bf5f28fe6159100fbc6f94b66386f3d7
Affiliations	Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620990, Russian Federation; Division of Solid State Magnetism, Research Institute of Physics and Applied Mathematics, Ural Federal University, pr. Lenina 51, Ekaterinburg, 620083, Russian Federation; Department of Materials Science and Egineering, Dankook University, Chonan, South Korea
Author Keywords	Fast-neutron irradiation; Ferrimagnetic order; Ferromagnetic order; Neutron diffraction; Permanent magnets
References	Burzo, E., Permanent magnets based on r-fe-b and r-fe-c alloys (1998) Rep. Prog. Phys., 61, pp. 1099-1266; Buschow, K.H.J., New developments in hard mag-netic materials (1991) Rep. Prog. Phys., 54, pp. 1123-1213; Bader, S.D., Colloquium: Opportunities in nanomag-netism (2006) Rev. Mod. Phys., 78, pp. 1-15; Meisner, G.P., Panchanathan, V., Study of des-orbed hydrogen decrepitated anisotropic nd2fe 14b powder using x-ray diffraction (1994) J. Appl. Phys., 76, pp. 6259-6261; Andreev, S.V., Kudrevatykh, N.V., Pushkarsky, V.I., Markin, P.E., Zaikov, N.K., Tarasov, E.N., Mag-netic hysteresis properties of melt-spun nd-fe-b alloys prepared by centrifugal method (1998) J. Magn. Magn. Mater., 187, pp. 83-87; Gaviko, B.C., Popov, A.G., Ermolenko, A.C., Shchegoleva, K.N., Stolyarov, V.V., Gun-Derov, D.V., Decomposition of the nd2fe 14b intermetallic compound upon severe plastic deformation by shear under pressure (2001) Phys. Met. Metallogr., 92, pp. 158-166; Popov, A.G., Gaviko, B.C., Shchegoleva, N.K., Shreder, L.A., Stolyarov, V.V., Gunderov, D.V., Kh. Yu. Zhan, Li, L.L., High-pressure-Tor-sion deformation of melt-spun nd9fe 85b 6 alloy (2007) Phys. Met. Metallogr., 104, pp. 238-247; Nino, A., Umakoshi, Y., Electron irradiation induced crystallization and amorphization in fe77nd4.5b18.5 metallic glass (2007) Mater. Sci. Eng., A, 449-451, pp. 1115-1118; Rodriguez, J.C., Recent advances in magnetic struc-Ture determination by neutron powder diffraction (1993) Physica B, 192, pp. 55-69; Herbst, J.F., Croat, J.J., Yelon, W.B., Structural and magnetic properties of nd2fe 14b (1985) J. Appl. Phys., 57, pp. 4086-4090; Dalmas, R., Fruchart, D., Pontonnier, L., Vaillant, F., Wolfers, P., Yaouanc, A., Coey, J.M.D., Heritier, P.H., Structural and magnetic properties of re2fe 14bh(d)x (1987) J. Less. Comm. Met., 129, pp. 133-144; Debye, P., Anderson, R., Brumberger, H., Scattering by an inhomogeneous solid. Ii. The correlation func-Tion and its application (1957) J. Appl. Phys., 28, pp. 679-683; Bale, H.D., Paul, W., Schmidt, P.W., Small-Angle x-ray-scattering investigation of submicroscopic porosity with fractal properties (1984) Phys. Rev. Lett., 53, pp. 596-599; Fang, J.S., Hsieh, M.F., Chen, S.K., Chin, T.S., Magnetic properties and structure of nd(fe,b) nanocomposite alloys with fixed fe/b ratio at 4-14 (1997) Jpn. J. Appl. Phys., 36, pp. 6316-6324; Svergun, D.I., Feigin, L.A., (1986) Small-Angle X-ray and Neutron Scattering, , Nauka, Moscow,[in Rus-sian]; Chikasumi, S., (1984) Physics of Ferromagnetism. Magnetic Characteristics and Engineering Applications, , Syokabo, Tokyo,; Mir, Moscow, 1987
Correspondence Address	Teplykh, A.E.; Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620990, Russian Federation
Language of Original Document	English
Abbreviated Source Title	Phys. Met. Metallogr.
Source	Scopus