Effect of Ni substitution on the microwave dielectric properties of cordierite
Effect of Ni substitution on the microwave dielectric properties of cordierite
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DOI：
10.1016/j.jeurceramsoc.2006.11.050
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发表时间：
2007
影响因子：
5.7
通讯作者：
M. Terada;K. Kawamura;I. Kagomiya;K. Kakimoto;H. Ohsato
中科院分区：
文献类型：
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作者：
M. Terada;K. Kawamura;I. Kagomiya;K. Kakimoto;H. Ohsato
堇青石(Mg_2Al_4Si_5O_(18))是一种低介电常数(ɛ_r)的硅酸盐，有望成为毫米波介质的良好候选者。研究了(Mg_1-−_xNi_x)_2Al_4Si_5O_(18)的微波介电性能。在x=0~0.1时，得到了无第二相的(Mg_1-−_xNix)_2Al_4Si_5O_(18)。结果表明，极少量的Ni替代有效地提高了材料的品质因数(Qf)值，在x=0.1时，QF值达到最大值99,110 GHz。在x=0.0 5~0.2范围内，共振频率温度系数(τf)与组份的关系不明显，但随着x从0.3增加到0.5，τ急剧向负值移动。讨论了堇青石的晶体结构与微波介电性能，特别是QF之间的关系。
Cordierite (Mg2Al4Si5O18) is one of the silicates with low dielectric constant (ɛr), which are expected for good candidate of millimeter wave dielectrics. Microwave dielectric properties of Ni substituted cordierite solid solutions; (Mg1−xNix)2Al4Si5O18have been investigated. (Mg1−xNix)2Al4Si5O18with no secondary phase was obtained in the compositions x range from 0 to 0.1. It was found that a very small amount of Ni substitution was effectively increased of the quality factor (Qf) value and the highest Qf value of 99,110GHz was obtained in the composition x=0.1. No remarkable composition dependence of the temperature coefficient of resonance frequency (τf) was observed in the range from x=0.05 to 0.2, On the other hand, τfabruptly shifted toward negative value with increasing x from 0.3 to 0.5. The correlation between the crystal structure of cordierite and the microwave dielectric properties, particularly Qf is discussed.