| Effect of La2O3-Dopant on Microstructure and Microwave Dielectric Properties of CaO-MgO-Nb2O5-TiO2 System Ceramics |
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| 作者姓名： | 王浩 陈文 刘涛 |
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| 作者单位： | Institute of Materials Science and Engineering，Wuhan University of Technology，Wuhan 430070，China，Institute of Materials Science and Engineering，Wuhan University of Technology，Wuhan 430070，China，Institute of Materials Science and Engineering，Wuhan University of Technology，Wuhan 430070，China |
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| 基金项目： | Project supported by the National Science Foundation (50272044) of China |
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| 摘 要： | With the development of microwave integratedsystem for wireless communication, requirements ofthe microwave device are combined with high dielec tric constants (εr), low dielectric losses (Q = 1/tanδ) and near zero temperature coefficient for stabili ty and frequency selectivity1,2]. But it is hard to findmaterials that satisfy all above mentioned requiredcharacteristics. In general, a ceramic with a high di electric constant has a larger positive temperature coef fi…
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| 关 键 词： | 无机非金属材料 稀土元素 微波介电陶瓷 钙钛矿 镧 |
Effect of La2O3-Dopant on Microstructure and Microwave Dielectric Properties of CaO-MgO-Nb2O5-TiO2 System Ceramics |
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| Wang Hao,Chen Wen,Liu Tao.Effect of La2O3-Dopant on Microstructure and Microwave Dielectric Properties of CaO-MgO-Nb2O5-TiO2 System Ceramics[J].Journal of Rare Earths,2005,23(1):32-35. |
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| Authors: | Wang Hao Chen Wen Liu Tao |
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| Abstract: | La2O3-doped CaO-MgO-Nb2O5-TiO2 system ceramics were prepared by solid-state ceramic technique. The microstructure and microwave dielectric properties of CaO-MgO-Nb2O5-TiO2-La2O3 ceramics can be adjusted by varying the amount of La3+ ions. The results show that the replacement of Ca2+ by La3+ at A-site of the ceramics can increase the quality factor Q*f value as well as the temperature coefficient of resonant frequency τf and decrease the dielectric constant εr. With increase of La3+ contents, the dielectric constant decreases from 57 to 35 and Q*f value increases from 33400 GHz to 35000 GHz (at 7.6 GHz). Meanwhile, the temperature coefficient of resonant frequency is improved towards near zero. The dielectric properties of these compounds are related to octahedra tilting due to deficient vacancies at A-site. |
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| Keywords: | inorganic nonmetallic materials perovskite microwave dielectric ceramics dielectric properties rare earths |
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