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Title: Development of magneto-dielectric materials based on Li-ferrite ceramics. III. Complex relative permeability and magneto-dielectric properties
Authors: Kong, L.B. 
Teo, M.L.S.
Li, Z.W. 
Lin, G.Q. 
Gan, Y.B. 
Keywords: Complex permeability
Lithium ferrite
Magnetic loss
Refraction index
Issue Date: 14-Jul-2008
Citation: Kong, L.B., Teo, M.L.S., Li, Z.W., Lin, G.Q., Gan, Y.B. (2008-07-14). Development of magneto-dielectric materials based on Li-ferrite ceramics. III. Complex relative permeability and magneto-dielectric properties. Journal of Alloys and Compounds 459 (1-2) : 576-582. ScholarBank@NUS Repository.
Abstract: This paper reports on the effects of Bi2O3 and Co on the magnetic properties of Li0.50Fe2.50O4 ceramics. The magnetic properties (static permeability) of the lithium ferrite ceramics with low concentration of Bi2O3 (0.2% and 0.5%), as a function of sintering temperature, can be explained by the magnetic circuit model, while those of the samples with high concentration (1-5%) are in a good agreement with the Globus model. Both models are not applicable to the results of pure Li0.50Fe2.50O4 samples, because their magnetic properties are determined by both the density and grain size. Further modification of Li0.50Fe2.50O4 with Co makes it possible to produce ferrite ceramics with promising magneto-dielectric properties. Maximum static permeability is observed in Li0.50-0.50xCoxFe2.50-0.50xO4 at x = 0.01, which can be qualitatively explained by magnetocrystalline anisotropy and ion ordering induced local uniaxial anisotropy. It is found that the Li0.50-0.50xCoxFe2.50-0.50xO4 (with x = 0.030-0.035) ceramics sintered at ≤950 °C have matching permeability and permittivity of 13-15, as well as sufficiently low magnetic and dielectric loss tangents of ≤10-2, over 3-30 MHz (HF band). From the laws of physics, HF antennas can be physically reduced by a factor of 13-15, with unchanged electrical dimension, if loaded with this class of magneto-dielectric materials. © 2007 Elsevier B.V. All rights reserved.
Source Title: Journal of Alloys and Compounds
ISSN: 09258388
DOI: 10.1016/j.jallcom.2007.04.257
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