Structural, magnetic, and electrical properties of (pr0.5er0.5)2fe17-xalx
TL;DR: In this article, an x-ray diffraction study of (Pr0.5Er 0.5)2Fe17−xAlx (0≤x≤10) shows an expansion of its unit cell with x. This effect may be due to the charge transfer from Al to the 3d band of Fe.
Abstract: An x‐ray diffraction study of (Pr0.5Er0.5)2Fe17−xAlx (0≤x≤10) shows an expansion of its unit cell with x. The crystal structure changes from hexagonal Th2Ni17 to rhombohedral Th2Zn17 at x=6. The magnetic moment decreases by increasing the Al concentration. This effect may be due to the charge transfer from Al to the 3d band of Fe. The Curie temperatures are found to increase with Al up to x=3 and then decrease up to x=10, and the possible underpinning mechanisms are discussed. X‐ray diffractograms of the magnetically aligned samples indicate that the easy magnetization directions of the samples with x=1,2,3, and 4 lie on a cone about the c axis. Electrical resistivity measurements show that the residual resistivity increases drastically with the Al concentration. The temperature coefficient of resistivity becomes almost zero for intermediate Al concentrations.
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TL;DR: In this paper, the variations in the lattice parameters (unit cell volume, site occupancies and Curie temperature) when non-transition and transition metals are substituted for Fe in R 2 Fe 17 compounds are discussed.
Abstract: R 2 Fe 17 (R = rare earth) intermetallic compounds constitute one of the most important classes of materials identified as high-energy permanent magnet materials. They crystallize either in the rhombohedral Th 2 Zn 17 structure (for light R) or in the hexagonal Th 2 Ni 17 structure (for heavy R). In this article, we discuss the variations in the lattice parameters (unit cell volume), site occupancies and Curie temperature when non-transition and transition metals are substituted for Fe in R 2 Fe 17 compounds.
16 citations
TL;DR: In this article, the structural stability of the intermetallic compounds R 2 Co 17 (T=Be, C) is tested by many means including random atom shifts, global deformations and high temperature disturbances under the control of the pair potentials.
13 citations
TL;DR: The structural and magnetic properties of HoErFe 17− x Ga x (x = 0-7) were studied by means of X-ray diffraction and magnetization measurements as mentioned in this paper.
10 citations
TL;DR: In this article, the alloys ErPrFe 17− x Ga x and ErPr Fe 17−x Si x ( x = 0-3.5) have been prepared and their structure and magnetization have been investigated.
10 citations
TL;DR: In this article, the crystal structure and magnetic properties of Nd2-xTbxFe17 and NdTbFe17-yAlv compounds were studied by means of X-ray diffraction and magnetization measurements.
9 citations
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TL;DR: A survey of the physical properties, composition and crystal structure of intermetallic compounds formed between rare-earth elements and 3D transition elements is given in this article.Apart from binary compounds, the results of pseudobinary series are also considered.
Abstract: A survey is given of the physical properties, composition and crystal structure of intermetallic compounds formed between rare-earth elements and 3d transition elements. Apart from binary compounds the results of pseudobinary series are also considered. The magnetic properties determined by the exchange interactions involving 4f as well as 3d electrons, are discussed together with experimental results available on magnetovolume effects and various resonance techniques such as NMR and the Mossbauer effect.
1,189 citations
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
TL;DR: In this article, the origin of the low temperature coefficient of resistance in NiCr thin films is investigated, and it is shown that this coefficient is an intrinsic property of the alloy.
Abstract: Results are presented of an investigation on the origin of the low temperature coefficient of resistance in NiCr thin films. It is shown that this low temperature coefficient is an intrinsic property of the alloy. Besides NiCr a large number of disordered alloys containing transition metals have similar conduction properties, both in bulk and as a thin film. For these materials a correlation has been found between the resistivity and its temperature coefficient. These anomalous conduction properties are probably caused by the very small electron mean free path in these materials.
751 citations
TL;DR: The physical properties of many of the rare-earth intermetallic compounds have been discussed in terms of the role that the magnetic exchange and crystal field interactions play in determining these properties.
Abstract: The physical properties of many of the rare-earth intermetallic compounds have been collected together. They are discussed in terms of the role that the magnetic exchange and crystal field interactions play in determining these properties. It is pointed out that in this vast number of materials there is an ideal chance of establishing which of several second-order terms are effective in determining structural stability.
405 citations
TL;DR: In this article, a review of the development of RETM5 and RE2TM17 permanent magnet alloys is presented, including phase diagrams, crystal structures, magnetocrystalline anisotropy, coercivity mechanisms, fabrication technologies, processing-microstructure-property interrelationships, and thermal effects related to them.
Abstract: RETM5 and RE2TM17 (RE=rare earth, TM=transition metal) permanent magnets are discussed in this review. The scientific and technological considerations which have guided their development are described. Along with a discussion of the various research efforts reported in the literature, they help establish the framework within which most of the work can be integrated and understood. In regard to the RETM5 alloys, the review limits itself to the technologically significant SmCo5 materials; others are discussed minimally, and only to the extent that they contributed to overall magnet development efforts. Likewise, from among the fabrication technologies, the review is limited to those processes which have been demonstrated as capable of producing magnets in bulk useful form. Areas covered in this review include phase diagrams, crystal structures, magnetocrystalline anisotropy, coercivity mechanisms, fabrication technologies, processing‐microstructure‐property interrelationships, and thermal effects related to...
194 citations