Low-Fire Bismuth-Based Dielectric Ceramics for Microwave Use
Low-Fire Bismuth-Based Dielectric Ceramics for Microwave Use
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DOI：
10.1143/jjap.31.3152
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发表时间：
1992-09
影响因子：
1.5
通讯作者：
H. Kagata;Tatsuya Inoue;Junichi Kato Junichi Kato-Junichi-Kato;Ichirou Kameyama Ichirou Kameyama-Ichirou-Kameyama
中科院分区：
文献类型：
--
作者：
H. Kagata;Tatsuya Inoue;Junichi Kato Junichi Kato-Junichi-Kato;Ichirou Kameyama Ichirou Kameyama-Ichirou-Kameyama
研究了几种铋基陶瓷在微波频率下的介电性能。含有CuO和V2O5的BiNbO4陶瓷具有高Q值，Q = 4260（4.3 GHz），ε = 43，τ f =+38 ppm/° C。在Bi2O3-CaO-Nb2O5系统中，Bi18Ca8Nb12O65组合物具有高介电常数ε = 59，Q = 610（在3.7 GHz下），τ f =+24 ppm/° C。该组合物的晶体结构被认为是基于体心四元晶胞（a = 0.377，c = 0.542nm）的有序结构。Zn替代Ca后，ε增大，τ f变为负值。在45.75BiO_（3/2）-21.75（Ca_（0.725）Zn_（0.275））O-32.5NbO_（5/2）组成下，获得了ε = 79，Q = 360（3.3GHz），τ f =+1ppm/° C的优异性能。由于上述陶瓷均可在950 ° C以下烧结，因此适用于Ag内导体多层微波器件。
We have investigated dielectric properties of several bismuth-based ceramics at microwave frequencies. BiNbO4 ceramics containing CuO and V2O5, had a high Q value of Q=4260 (at 4.3 GHz), ε=43, and τf=+38 ppm/°C. In the Bi2O3-CaO-Nb2O5 system, Bi18Ca8Nb12O65 composition had a high dielectric constant of ε=59, Q=610 (at 3.7 GHz), and τf=+24 ppm/°C. The crystal structure of this composition is considered to be an ordered structure based on the body center tetragonal cell (a=0.377, c=0.542 nm). Furthermore, by substituting Zn for Ca, ε increased and τf changed to negative values. In the composition of 45.75BiO3/2-21.75(Ca0.725Zn0.275)O-32.5NbO5/2, excellent properties of ε=79, Q=360 (at 3.3 GHz), and τf=+1 ppm/°C were obtained. As all the above ceramics can be sintered below 950°C, they are applicable to multilayer microwave devices with Ag inner conductors.