| Effect of Rare Earth Oxides on the Microstructure and Microwave Dielectric Properties of CaO-MgO-Nb2Os-TiO2 System Ceramics |
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| 引用本文： | WANG Hao CHEN Wen LIU Tao. Effect of Rare Earth Oxides on the Microstructure and Microwave Dielectric Properties of CaO-MgO-Nb2Os-TiO2 System Ceramics[J]. 武汉理工大学学报(材料科学英文版), 2005, 20(4): 83-86. DOI: 10.1007/BF02841290 |
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| 作者姓名： | WANG Hao CHEN Wen LIU Tao |
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| 作者单位： | School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China |
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| 基金项目： | Funded by the National Natural Science Foundation of China（50272044） |
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| 摘 要： | La2O3 and SrO-doped CaO-MgO-Nb2O3-TiO2 system ceramics were prepared by solid-state ceramic technique.The microstructure and microwave dielectric properties of CaO-MgO-Nb2O5-TiO2-La2O3 cermics can be adjusted by varying the amount of La^3＋ or Sr^2＋ ions respectively.The replacement of Ca^2＋ by La^3＋ at A-site of the ceramics increases the quality factor Q value（ at 7.6GHz）as well as the temperature coefficient of resonant frequency τf and decreases the dielectric constant εr and the substitution of Sr^2＋ at A-site in this ceramics system exhibits opposite characteristics.The microwave properties of La^3＋,Sr^2＋-doped CaO-MgO-Nb2O5-TiO2 system ceramics depend on the degree of octahedral distortion inside materials.
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| 关 键 词： | 微波介电陶瓷 稀土氧化物 钙钛矿 微观结构 氧化钙 氧化镁 五氧化二铌 二氧化钛 |
| 收稿时间： | 2005-04-08 |
| 修稿时间： | 2005-08-14 |
Effect of rare earth oxides on the microstructure and microwave dielectric properties of CaO−MgO−Nb2O5−TiO2 system ceramics |
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| Wang Hao Ph D,Chen Wen,Liu Tao. Effect of rare earth oxides on the microstructure and microwave dielectric properties of CaO−MgO−Nb2O5−TiO2 system ceramics[J]. Journal of Wuhan University of Technology. Materials Science Edition, 2005, 20(4): 83-86. DOI: 10.1007/BF02841290 |
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| Authors: | Wang Hao Ph D Chen Wen Liu Tao |
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| Affiliation: | (1) School of Materials Science and Engineering, Wuhan University of Technology, 430070 Wuhan, China |
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| Abstract: | La2O3 and SrO-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+ or Sr2+ ions respectively. The replacement of Ca2+ by La3+ at A-site of the ceramics increases the quality factor Q value (at 7.6 GHz) as well as the temperature coefficient of resonant frequency τ f and decreases the dielectric constant ɛ, and the substitution of Sr2+ at A-site in this ceramics system exhibits opposite characteristics. The microwave properties of La3+, Sr2+-doped CaO−MgO−Nb2O5−TiO2 system ceramics depend on the degree of octahedral distortion inside materials. Funded by the National Natural Science Foundation of China (50272044) |
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| Keywords: | perovskite microwave dielectric ceramic dielectric properties |
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