Microwave dielectric properties of forsterite-based solid solutions
Microwave dielectric properties of forsterite-based solid solutions
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DOI：
10.1016/j.jeurceramsoc.2005.09.102
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发表时间：
2006-01-01
影响因子：
5.7
通讯作者：
Ohsato, Hitoshi
中科院分区：
文献类型：
--
作者：
Sugiyama, Tomonori;Tsunooka, Tsutomu;Ohsato, Hitoshi
镁橄榄石是一种优良的毫米波介质材料。然而，其谐振频率（τ（f））的温度变化相对较大，这妨碍了其在实际应用中的直接使用。本文报道了Ca和Mn取代Mg对镁橄榄石微波介电性能的影响。组成0.975Mg（2）SiO（4）-0.025Mn（2）SiO（4）显示出优异的180，000 GHz的Q x f值和-71ppm/摄氏度的τ（f）。端元Mn 2SiO 4显示出50，000 GHz的Q × f，8.52的τ（r）和τ（f）= -90 ppm/摄氏度。在Ca替代Mg的情况下，τ（f）随着Ca量的增加而向高负值移动。然而，Q x f并没有显示出其值的太大变化。结果表明，τ（f）向负值方向的增加与取代基的离子半径有关。(c)2005爱思唯尔有限公司保留所有权利。
Recently forsterite has been reported as an excellent dielectric material for millimeter wave application. However, its temperature variation of the resonant frequency (tau(f)) is relatively large which precludes its immediate use in practical applications. In this paper, we report the effect of substituting Ca and Mn for Mg on the microwave dielectric properties of forsterite. The composition 0.975Mg(2)SiO(4)-0.025Mn(2)SiO(4) showed excellent Q x f value of 180,000 GHz with a tau(f) of -71 ppm/degrees C. The end member Mn2SiO4, showed a Q x f of 50,000GHz, epsilon(r) of 8.52 and tau(f) = -90 ppm/degrees C. In the case of Ca substitution for Mg, tau(f) shifted to high negative value with increasing amount of Ca. However, Q x f did not show much change in its value. It is suggested that the increase of tau(f) towards a more negative value is related to the ionic radii of the substitutes. (c) 2005 Elsevier Ltd. All rights reserved.