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Journal ArticleDOI

Magnetic interactions in R2Fe17-xAlx compounds (R = Ho, Y)

01 Oct 1992-Journal of Magnetism and Magnetic Materials (North-Holland)-Vol. 116, pp 220-230
TL;DR: In this article, the temperature and field dependence at 4.2 K of the magnetization of Y2Fe17−xAlx and Ho2Fe 17−xalx (x ≤ 10) compounds has been studied.
About: This article is published in Journal of Magnetism and Magnetic Materials.The article was published on 1992-10-01. It has received 125 citations till now. The article focuses on the topics: Magnetization & Coupling constant.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a review of the experimental values of the magnetic intersublattice-coupling constants in rare-earth (R) transition-metal (T) intermetallics, derived from high-field magnetization measurements on single-crystalline powder particles that are free to be oriented by the applied magnetic field.

158 citations

Journal ArticleDOI
TL;DR: In this paper, the structural and magnetic properties of SmCo7−xCux have been reported, where x = 0, 0.1, 0., 0.2, 0.3, 0, 4, 0, 5, and 0.7.
Abstract: We report the structural and magnetic properties of SmCo7−xCux, where x=0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.7. X-ray diffraction shows that these alloys from the disordered hexagonal TbCu7-type structure. For large values of x(x⩾0.8) the hexagonal TbCu7-type structure cannot be formed. X-ray diffraction on magnetically aligned samples show that these samples have uniaxial anisotropy. The lattice parameters (a and c) are dependent on the Cu concentration, and the unit cell volume is found to increase with x. The saturation magnetization decreases with x at both room temperature and 25 K. The Curie temperature increases with x for small values of x while it decreases with x for large values of x. A maximum value of TC=852 °C is found in these alloys.

88 citations

Journal ArticleDOI
TL;DR: In this article, the Curie temperature of the R2Fe17-xAlx compounds was found to increase from TC=391K for the x=0 sample to TC=471 K for the X=3 sample.
Abstract: Compounds in the series Sm2Fe17-xAlx have been investigated. Samples with x=0, 1, 2, 3 and 4 have been shown to be single phased with the Th2Zn17 structure. The Curie temperature is found to increase from TC=391K for the x=0 sample to TC=471 K for the x=3 sample. Further substitution of Al for Fe decreased TC. X-ray diffraction studies of magnetic-field-oriented powders showed that alloys with x 2 exhibit easy axis anisotropy. The x=2 sample showed a mixture of easy plane and easy axis behaviour. This observation represents the first case of clear evidence for room temperature uniaxial anisotropy in the R2Fe17 compounds without the addition of interstitial nitrogen or carbon.

86 citations

Book ChapterDOI
TL;DR: In this article, the magnetic properties of binary rare-earth 3d-transition-metal intermetallic compounds are discussed, and the basic concepts related to intrinsic magnetic properties related to the 3D-rich R n T m (R = rare earths; T = 3d heavy transition metals Mn, Fe, Co, Ni) intermetallics are discussed.
Abstract: Publisher Summary This chapter discusses the magnetic properties of binary rare-earth 3d-transition-metal intermetallic compounds The basic concepts related to the intrinsic magnetic properties of the 3d-rich R n T m (R = rare earths; T = 3d heavy transition metals Mn, Fe, Co, Ni) intermetallic compounds are discussed The study of rare-earth transition-metal intermetallic compounds has a number of interesting aspects Owing to the wide range of intermetallics and their different stoichiometries and variable rare-earth elements, modifications of magnetic properties of 3d transition-metal and 4f rare-earth ions can be investigated systematically These investigations illuminate the complex interactions in which the 3d and 4f electrons are involved The rare-earth metals in their ‘normal’ state where the magnetic properties of the ion cores are well defined The 4f electrons are positioned within the ion cores and hybridization with the conduction-band-electron states is negligible This situation is realized for most iron- and cobalt-based compounds with 4f elements The Ce and Yb ions, which sometimes demonstrate unusual properties connected with valence fluctuations, tend to behave quite normally in the compounds with iron or cobalt Nevertheless, there are some anomalies in the Ce compounds that can be ascribed to a mixed-valence state of the cerium ion

82 citations

Journal ArticleDOI
TL;DR: In this article, the structure and intrinsic magnetic properties of Sm2Fe17-xGax (0 5 ) samples with x = 1 and 5 showed a mixture of easy-plane and easy-axis behaviour.
Abstract: The structure and intrinsic magnetic properties of Sm2Fe17-xGax (0 5 exhibit easy-plane anisotropy while samples with 1 < x < 5 exhibit easy c-axis anisotropy. The samples with x = 1 and 5 show a mixture of easy-plane and easy-axis behaviour.

55 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the R2Ni17 and R2Fe17C intermetallic compounds were found to absorb approximately two atoms of nitrogen per formula unit on heating in ammonia or nitrogen.

1,059 citations

Journal ArticleDOI
K.H.J. Buschow1
TL;DR: A review of the physical properties, composition and crystal structure of intermetallic compounds formed between rare-earth elements and non-magnetic metals, with emphasis on the magnetic properties is given in this article.
Abstract: A review is given of the physical properties, composition and crystal structure of intermetallic compounds formed between rare-earth elements and non-magnetic metals, with emphasis on the magnetic properties. Included are the properties of compounds in which the non-rare-earth component is a 4d or 5d transition element. Special consideration is given to the properties of pseudo-binary compounds. Results of magnetisation measurements, neutron diffraction and neutron scattering are discussed together with results derived from NMR, ESR and Mossbauer effect spectroscopy. An evaluation is given of the relevance of the experimental results with respect to different types of exchange interactions in this class of intermetallics. Special consideration is also given to the influence of crystal field effects on the magnetic properties and, furthermore, to the occurrence of intermediate valences in several of the compounds of Ce, Sm, Eu and Yb.

290 citations

Journal ArticleDOI
TL;DR: In this paper, the magnetic properties of the rhombohedral R 2 Fe 17 C compounds with R = Ce, Pr, Sm, Gd, Tb, Dy, Ho or Y were studied on magnetically aligned powders in field strengths up to 35 T.

250 citations

Journal ArticleDOI
TL;DR: In this article, a new experimental technique is presented to determine the intersublattice molecular-field coefficient, n RT, in heavy rare earth-transition-metal intermetallic compounds.

100 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the effect of the R-4f moments on the conduction band system of RFe 2 compounds and showed that the effect depends on the local exchange interaction between rare-earth and transition-metal moments.
Abstract: The combination of itinerant transition metal (M = Fe) and localized rare-earth (R = Gd-Y) magnetism in RFe 2 compounds has been investigated in self-consistent energy band calculations. The computed and measured total moments are in good agreement for all cases where single crystal data are available. We find, however, that there is a significant contribution to the moment from the R-5d partial moments coupled antiparallel to the Fe-3d moment which results from 3d–5d hybridization. The R-4f moments interact with the conduction band system solely by local exchange interactions, which are calculated ab initio from density functional theory. A sum rule for the total 3d + 5d moment is shown to be obeyed and the effective ferrimagnetic exchange interaction between rare-earth and transition-metal moments is discussed. Finally, the spin wave spectra of these materials are evaluated in terms of a model arising from these calculations.

77 citations