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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Development of magneto-dielectric materials based on Li-ferrite ceramics III. Complex relative permeability and magneto-dielectric properties
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Development of magneto-dielectric materials based on Li-ferrite ceramics III. Complex relative permeability and magneto-dielectric properties

机译：基于锂铁氧体陶瓷的磁电介质材料的开发复数相对磁导率和磁介电性能

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摘要

This paper reports on the effects of Bi_2O_3 and Co on the magnetic properties of (Li_(0.50)Fe_(2.50)O_4) ceramics. The magnetic properties (static permeability) of the lithium ferrite ceramics with low concentration of Bi_2O_3 (0.2 percent and 0.5 percent), as a function of sintering temperature, can be explained by the magnetic circuit model, while those of the samples with high concentration (1-5 percent) are in a good agreement with the Globus model. Both models are not applicable to the results of pure (Li_(0.50)Fe_(2.50)O_4) samples, because their magnetic properties are determined by both the density and grain size. Further modification of (Li_(0.50)Fe_(2.50)O_4) with Co makes it possible to produce ferrite ceramics with promising magneto-dielectric properties. Maximum static permeability is observed in Li_(0.50-0.50x)Co_xFe_(2.50-0.50x)O_4 at x=0.01, which can be qualitatively explained by magnetocrystalline anisotropy and ion ordering induced local uniaxial anisotropy. It is found that the Li_(0.50-0.50x)Co_xFe_(2.50-0.50x)O_4 (with x=0.030-0.035) ceramics sintered at <=950 deg 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.
机译：本文报道了Bi_2O_3和Co对（Li_（0.50）Fe_（2.50）O_4）陶瓷磁性能的影响。低浓度Bi_2O_3（0.2％和0.5％）的锂铁氧体陶瓷的磁性能（静态磁导率）随烧结温度的变化可以通过磁路模型解释，而高浓度样品的磁性能（ 1-5％）与Globus模型非常吻合。这两种模型都不适用于纯（Li_（0.50）Fe_（2.50）O_4）样品的结果，因为它们的磁性能由密度和晶粒尺寸决定。用Co对（Li_（0.50）Fe_（2.50）O_4）的进一步修饰使得可以生产具有有希望的磁介电性能的铁氧体陶瓷。在x = 0.01的Li_（0.50-0.50x）Co_xFe_（2.50-0.50x）O_4中观察到最大静态磁导率，可以用磁晶各向异性和离子有序诱导的局部单轴各向异性定性地解释。发现在<= 950摄氏度下烧结的Li_（0.50-0.50x）Co_xFe_（2.50-0.50x）O_4（x = 0.030-0.035）陶瓷的匹配磁导率和介电常数为13-15，并且具有足够的匹配性在3-30 MHz（HF频段）上的低磁损耗和介电损耗正切<= 10〜（-2）。根据物理定律，如果加载此类磁电介质材料，则HF天线在物理上可以减小13-15倍，而电气尺寸不变。

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