Landolt-Börnstein - Group III Condensed Matter Intrinsic properties


This chapter discusses properties of Nd2Fe14B-type magnet alloys. The discovery of Nd-Fe-B permanent magnet materials has caused a major interest in the intrinsic and technological properties of Nd2Fe14B-type compounds. These magnetic materials consist of a tetragonal ternary intermetallic compound with the Nd2Fe14B-structure as the main phase. The permanent magnet properties, such as remanence, coercivity, maximum energy product and their temperature dependence are strongly influenced by the basic magnetic properties of the main phase. Lattice parameters of R2Fe14compounds are tabulated. Temperature dependence of lattice constants a and c and the unit cell volume V a and c and unit cell volume V Y2Fe14B, Sm2Fe14B, Nd2Fe2B, room-temperature density of R2Fe14B compounds, crystallographic and magnetic data of R2Fe14-xGaxB, Curie temperature of R2Fe14B compounds and Nd2(Fe1-xCox)14B compounds are tabulated. Composition dependence of the Curie temperature Tc of R2Fe1-xCox)xB, Nd2(Fe1-xMx)14B, Nd16(Fe1-xAlx)78B6 are illustrated. Saturation magnetization at 4.2 K and 300 K measured along the easy direction of magnetization on single crystals of R2Fe14B and La2Fe14B and Lu2Fe14B are listed. Magnetocrystalline anisotropy field and anisotropy constants at 4.2 K and room temperature of R2Fe14B are shown. Temperature dependence of magnetic anisotropy field HA and concentration dependence of the first-order magnetic anisotropy constant are also illustrated. Spin reorientation transition temperature of TsrR2Fe14B and theoretical single-domain particle size D, and magnetic parameters used in the estimation of Nd2Fe14B are also tabulated.

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Title Intrinsic properties
Book Title
Magnetic Alloys for Technical Applications. Hard Magnetic Alloys
7.2.3 Nd{2}Fe{14}B-type magnet alloys
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Chapter DOI
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Landolt-Börnstein - Group III Condensed Matter
  • H. P. J. Wijn
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  • H. P. J. Wijn
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