Low temperature fired and electromagnetic properties of a novel ferroelectric/ferromagnetic composite material

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• 作者：Weiwei Ling^a ; ^{lingweiwei@163.com} ; Hai Nie^a ; Yuanxun Li^b ; Huaiwu Zhang^b
• 关键词：Ferroelectric&ndash ; ferromagnetic composites ; LTCC ; Magnetic properties ; Dielectric properties ; Maxwell Garnett mixing rule
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 June, 2012
• 卷：525
• 期：Complete
• 页码：120-125
• 文件大小：1551 K

摘要

A series of Bi₄Ti₃O₁₂/Ni_0.25Cu_0.2Zn_0.55Fe₂O₄ ferroelectric-ferromagnetic composites were prepared by the usual ceramic technology and sintered at 900 掳C to adapt to the low temperature cofired ceramic (LTCC) technology. Among all samples, the relative density changes in the range of 94.9-96.4%and reaches the highest value in the composite with 30 wt%Bi₄Ti₃O₁₂ (BIT). When BIT content increases from 0 to 90 wt%, the magnetic and dielectric properties show different change trends: the permeability (real part) at 1 MHz reaches the maximum 170 in the composite with 10 wt%BIT at first, and then gradually decreases from 170 to 1.4, while the saturation magnetization decrease from 2.85 脳 10⁵ A/m to 1.6 脳 10⁴ A/m; the dielectric loss tangent obtains a maximum value about 0.47 in the composite with 10 wt%BIT at first, and then decreases sharply, while the permittivity (real part) at 1 MHz increases from 8.8 to 100.3. The Maxwell Garnett mixing rule was used to predict the magnetic and dielectric properties of the composites with different assumptions. The calculated results basing on BIT matrix were more approximate to the measured in comparison to that basing on ferrite matrix.