Microwave Characteristics of TiO2-Bi2O3 Dielectric Resonator
Microwave Characteristics of TiO2-Bi2O3 Dielectric Resonator
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DOI：
10.1143/jjap.32.4584
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发表时间：
1993-10
影响因子：
1.5
通讯作者：
K. Fukuda;Ryozo Kitoh Awai
中科院分区：
文献类型：
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作者：
K. Fukuda;Ryozo Kitoh Awai
从一个新的角度研究了具有较高介电常数的TiO 2-Bi 2 O3二元系陶瓷的微波特性。结果表明：0.919TiO_2 - 0.081Bi_2 O_3具有高介电常数（εr=80）、高Q值（5GHz时为1800）和低谐振频率温度系数（τf=+21ppm/°C）。X射线衍射和X射线微区分析表明，该材料的晶体结构由TiO 2和Bi 2 Ti4 O 11两相组成，分别具有高εr和负温度系数，高εr和正温度系数。为了研究该系统的温度补偿特性，还进行了线性热膨胀系数和电容温度系数的测量。
The microwave characteristics of the binary-system TiO2-Bi2O3 ceramics, which is widely known to exhibit a comparatively high dielectric constant in the lower-frequency band, are investigated from a new standpoint. It is shown in this article that the composition of 0.919TiO2-0.081Bi2O3 has a high dielectric constant (εr=80), high Q (1800 at 5 GHz) and low temperature coefficient of resonant frequency (τf=+21 ppm/°C). From the X-ray diffraction and X-ray microanalysis, it is indicated that the crystal structure of this material is composed of two phases, TiO2 and Bi2Ti4O11, which possess a high εr with a negative temperature coefficient and a high εr with a positive temperature coefficient, respectively. The measurements of linear thermal expansion and temperature coefficient of capacitance are also carried out in order to study the behavior of temperature compensation in this system.