Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.80: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

Structural and magnetic properties of Fe-Ce-W (12:1 and 29:3) intermetallic compounds — •Roman Karimi, Dagmar Goll, Ralf Loeffler, Roland Stein, and Gerhard Schneider — Materials Research Institute (IMFAA), Aalen University, Germany

For low-cost permanent magnet applications Ce-based hard magnetic intermetallic compounds are currently in the focus of research due to the better abundance of Ce in the earth crust compared to Nd or Dy. By bulk high-throughput experimentation based on heterogeneous non-equilibrium states the two hard magnetic compounds Fe₁₁WCe (12:1 phase stronger magnetic) and Fe_29−xW_xCe₃ (29:3 phase, weaker magnetic) have been discovered in the ternary system Fe-Ce-W. As Fe₁₁WCe looks very promising for novel permanent magnets single-phase material has been fabricated by arc-melting. The samples have been analyzed concerning their crystallographic structure and intrinsic magnetic properties using x-ray diffraction, domain pattern analysis and magnetometry. The lattice structure has been identified as ThMn₁₂ structure. For the intrinsic properties saturation polarization J_s, anisotropy constant K₁ and Curie temperature T_C values of J_s(RT)∼ 1.1 T, K₁(RT) ∼ 2 MJ/m³ and T_C ∼ 450 K were found for the 12:1 compound. Values of J_s(RT) ∼ 0.5 T and K₁(RT)∼ 0.5 MJ/m³ have been estimated for the 29:3 compound. Mechanical alloying is applied to realize nanocrystalline Fe₁₁WCe magnets. Project supported by BMBF (project REleaMag) and Carl-Zeiss-Stiftung.