Journal
RSC ADVANCES
Volume 5, Issue 111, Pages 91382-91388Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra17542a
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Funding
- National Science Foundation of China [51172020, 51372018]
- Program for New Century Excellent Talents in University [NCET-12-0780]
- Beijing Higher Education Young Elite Teacher Project [YETP0414]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1207]
- National Program for Support of Top-Notch Young Professionals
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M-type hexaferrite with appropriate Co, Ti and Bi co-doping has excellent soft magnetic properties in a very high frequency range and can be sintered at low temperatures. This paper systematically investigates the effect of these ion substitutions in different lattice sites for Ba1-xBix(Co(x+y)Tiy)Fe12-x-2yO19 (x = 0.05-0.3 & y = 1.0-1.2). Bi substitution promotes the sintering densification and lowers the sintering temperature by an approximate relation of T-s = 1150 - 1500x + 2500x(2), where a denser microstructure also works for higher permeability. Co substitution plays a key role in the magnetic properties through magnetocrystalline anisotropy. For all samples, the permeability always reaches a maximum when the Co amount (x + y) is around 1.2 because it has an appropriate planar magnetocrystalline anisotropy at such composition. This work can provide a clear guide for the design of magnetic materials at a very high frequency range.
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