A Study of the Effect of Magnetizing Field Strength on the Measured Values of Intrinsic Coercivity and Remanence in Commercial Rare-Earth Magnets

Magnetocrystalline anisotropy of novel R3(Fe, M)29compounds

“…For crystals with cubic, tetragonal and hexagonal structures, the magnetocrystalline anisotropy can be described in terms of anisotropy constants [18], as summarized in table 1. For the monoclinic structure, there will be three possibilities for the point group; with generating matrix of σ (3) for the point group 2, σ (5) for the point group m, σ (1) and σ (3) for the point group 2/m (see equation ( 11)). In the following, the forms of general polar tensors of second and fourth rank for this crystal symmetry are formulated.…”

“…4, 4, 4/m, 422, 4mm, 42m, 4/mmm K 1 sin 2 θ + K 2 sin 4 θ + K 3 sin 6 θ + K 4 sin 4 θ cos 4φ Trigonal [18] 3, 3, 32, 3m, 3m K 1 sin 2 θ + K 2 sin 4 θ + K 1 2 sin 3 θ cos θ cos 3φ +K 2 2 sin 6 θ cos 6φ + K 3 sin 6 θ +K 1 3 sin 3 θ cos 3 θ cos 3φ Hexagonal [18] 6, 6, 6/m, 622, 6mm, 6m2, 6/mmm K 1 sin 2 θ + K 2 sin 4 θ + K 3 sin 6 θ + K 4 sin 6 θ cos 6φ…”

“…Recently, the study of the magnetic properties of the new ternary phase with the Nd 3 (Fe, Ti) 29 -type structure is attracting considerable interest from both fundamental and practical points of view. This phase has been synthesized at the Fe-rich corner of the R (= rare-earth)-Fe phase diagram [1][2][3]. Initially, it has been reported that this phase has the nominal composition Nd 2 (Fe, Ti) 19 and that the diffraction patterns can be indexed as a superlattice of the hexagonal cell of the TbCu 7 type of structure.…”

Atomistic simulation for the phase stability and site preference of R3(Fe,T)29(R = Nd,Gd,Y; T = Ta,W)

“…The rare earth (R)-transition metal (T) intermetallic compounds have attracted great interest because of their potential application for permanent magnets [1]. In 1992, Collocott et al [2] synthesized a new compound defined as Nd 2 (Fe, Ti) 19 . Subsequently, x-ray powder diffraction [3] and neutron diffraction [4] showed that this new ternary compound crystallizes in monoclinic structure with space group P2 1 /c and the exact formula is Nd 3 (Fe, Ti) 29 .…”

Crystal structure and magnetic properties of Gd3Fe28Re

“…Essentially, both R(Fe,T) 12 and R 2 Fe 17 are derivatives of R(Fe,T) 5 of the CaCu 5 -type structure with appropriate ordered substitution of (Fe,T)-(Fe,T) dumb-bell for R atoms. Further exploitation of the R(Fe,T) 5 derivatives resulted in the discovery of R 3 (Fe,T) 29 compounds, which crystallize in a monoclinic structure and can be described more accurately by the space group A2/m than by P2 1 /c [10][11][12]. R 3 (Fe,T) 29 compounds are potential candidates as permanent magnet materials owing to their high performance.…”