Magneto-dielectric properties of Mg-Cu-Co ferrite ceramics: I. Densification behavior and microstructure development
Magneto-dielectric properties of Mg-Cu-Co ferrite ceramics: I. Densification behavior and microstructure development
复制标题
DOI：
10.1111/j.1551-2916.2007.01869.x
复制
发表时间：
2007-10
影响因子：
3.9
通讯作者：
L. Kong;Zhaoliang Li;G. Lin;Y. Gan
中科院分区：
文献类型：
--
作者：
L. Kong;Zhaoliang Li;G. Lin;Y. Gan
研究了Mg-Cu-Co铁氧体陶瓷（MgFe1.98O4，Mg 1 −xCuxFe1.98O4，x=0.10-0.30和Mg0.90−xCoxCu0.10Fe1.98O4，x=0.05-0.20）的致密化、晶粒生长和显微结构发展。主要目标是开发用于高频和甚高频天线小型化的磁介电材料。研究发现，镁铁氧体（MgFe 1.98O4）是一种很有前途的磁介质材料。然而，由于其致密性差，在低于1200°C的温度下无法完全烧结。高温烧结由于形成Fe 2+离子而导致不期望的电和介电性质。MgFe 1.98O4的致密化差和缓慢的晶粒生长速率可以通过引入Cu而得到显著改善，这是由于在高温下发生液相烧结。对于Mg 1 −xCuxFe1.98O4，观察到Cu的临界浓度，高于该浓度，致密化和晶粒生长都达到最大或饱和。Co的存在对镁基铁氧体陶瓷的致密化和晶粒长大没有显著影响。
The densification, grain growth, and microstructure development of Mg–Cu–Co ferrite ceramics (MgFe1.98O4, Mg1−xCuxFe1.98O4, with x=0.10–0.30 and Mg0.90−xCoxCu0.10Fe1.98O4, with x=0.05–0.20) were studied. The primary objective was to develop magneto-dielectric materials for miniaturization of high frequency and very-high frequency antennas. It was found that magnesium ferrite (MgFe1.98O4) is a promising magneto-dielectric material. However, due to its poor densification, it could not be fully sintered at a temperature below 1200°C. High-temperature sintering resulted in undesirable electrical and dielectric properties, due to the formation of Fe2+ ions. The poor densification and slow grain growth rate of MgFe1.98O4 can be considerably improved by incorporating Cu, due to the occurrence of liquid-phase sintering at a high temperature. A critical concentration of Cu was observed for Mg1−xCuxFe1.98O4, above which both densification and grain growth were maximized or saturated. The presence of Co did not have a significant influence on the densification and grain growth of the Mg-based ferrite ceramics.