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Title: Structure and magnetism of new rare-earth-free intermetallic compounds: Fe 3+xCo 3-xTi 2 (0 ≤ x ≤ 3)

Here, we report the fabrication of a set of new rare-earth-free magnetic compounds, which form the Fe 3Co 3Ti 2-type hexagonal structure with P-6m2 symmetry. Neutron powder diffraction shows a significant Fe/Co anti-site mixing in the Fe 3Co 3Ti 2 structure, which has a strong effect on the magnetocrystalline anisotropy as revealed by first-principle calculations. Increasing substitution of Fe atoms for Co in the Fe 3Co 3Ti 2 lattice leads to the formation of Fe 4Co 2Ti 2, Fe 5CoTi, and Fe 6Ti 2 with significantly improved permanent-magnet properties. A high magnetic anisotropy (13.0 Mergs/cm 3) and saturation magnetic polarization (11.4 kG) are achieved at 10 K by altering the atomic arrangements and decreasing Fe/Co occupancy disorder.
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  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  3. Iowa State Univ., Ames, IA (United States); Chinese Academy of Sciences, Hefei (People's Republic of China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 2166-532X; AMPADS; KC0402010; ERKCSNX
Grant/Contract Number:
AC05-00OR22725; AC02-07CH11358
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 11; Journal ID: ISSN 2166-532X
American Institute of Physics (AIP)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; x-ray diffraction; crystal structure; magnetic anisotropy; coercive force; density functional theory
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1347743