Landolt-Börnstein - Group III Condensed Matter Sm-Co-Cu magnet alloys


This chapter discusses magnetic properties of Sm-Co-Cu magnet alloys. The introduction of Cu in the alloys of the Sm-Co system can cause a precipitated second phase in the grains. The combination of the high magnetic anisotropy of the main phase with the occurrence of a fine precipitate forms an excellent base for the development of a permanent magnet material. In an argon atmosphere arc-melted and cast alloys, SmCo5-xCux alloy results in a microstructure of two separate 1: 5 phases, a Co-rich and a Co-poor phase. Partial cross sections of the phase space of the SmCo, lattice parameters versus Cu content in SmCoCu, intrinsic coercive force MHc versus composition of SmCo-SmCu alloy system, intrinsic coercive force MHc as dependent on a 4h-annealing procedure at a temperature Ta of SmCoCu are illustrated. The influence of preparation conditions on the permanent magnet properties of SmCo5-type compounds is shown. Part of the composition diagram of Sm-Co-Cu, intrinsic coercive force MHc and saturation magnetization Ms versus composition for coarse-grained alloys obtained by slowcooling of the melt, followed by a homogenization treatment for several days at 1200ºC of Sm(CoCu), and hysteresis loops of Sm(CoCu) magnet alloys are also figured out.

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Title Sm-Co-Cu magnet alloys
Book Title
Magnetic Alloys for Technical Applications. Hard Magnetic Alloys
7.2.2 Rare earth - 3d magnet alloys
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Landolt-Börnstein - Group III Condensed Matter
  • H. P. J. Wijn
  • Authors
  • D. Bonnenberg
  • H. P. J. Wijn
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