| Influence of CaF2 on the structure and dielectric properties of Ag（Nb0.8Ta0.2）O3 ceramics |
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| 引用本文： | CAO Lifeng,LI Lingxia,ZHANG Ping,WU Haitao. Influence of CaF2 on the structure and dielectric properties of Ag（Nb0.8Ta0.2）O3 ceramics[J]. 稀有金属(英文版), 2010, 29(1): 50-54. DOI: 10.1007/s12598-010-0009-3 |
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| 作者姓名： | CAO Lifeng LI Lingxia ZHANG Ping WU Haitao |
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| 作者单位： | CAO Lifeng,LI Lingxia,ZHANG Ping(School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China);WU Haitao(School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China;School of Materials Science and Engineering, University of Jinan, Jinan 250022, China) |
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| 基金项目： | the Program for New Century Excellent Talents in Universities (NCET)，the National High-Tech Research and Development Program of China，中国博士后基金 |
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| 摘 要： | Ag(Nb0.8Ta0.2)O3 ceramics were prepared by the traditional solid-state reaction method. The effect of CaF2 addition on the structure and di-electric properties of Ag(Nb0.8Ta0.2)O3 ceramics was investigated. The addition of CaF2 led the ceramics to a larger grain size and distortion of lattice. With the addition of 4.5 wt.% CaF2, the permittivity of the ceramics increased from 442 to 1028, the dielectric loss decreased sharply from 6.12 × 10-3 to 8.6 × 10-4, and the temperature coefficient of capacitance decreased from 1834 ppm/°C to-50 ppm/°C (at 1 MHz). These results indicated that the high permittivity was related with a large grain size, a low grain boundary density, and the weak Ta-O or Nb-O bond strength caused by the addition of CaF2.
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| 关 键 词： | 介电性能 氟化钙 陶瓷 O3 结构 高介电常数 晶粒尺寸 股份公司 |
| 收稿时间： | 2009-05-28 |
Influence of CaF2 on the structure and dielectric properties of Ag(Nb0.8Ta0.2)O3 ceramics |
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| Lifeng Cao,Lingxia Li,Ping Zhang,Haitao Wu. Influence of CaF2 on the structure and dielectric properties of Ag(Nb0.8Ta0.2)O3 ceramics[J]. Rare Metals, 2010, 29(1): 50-54. DOI: 10.1007/s12598-010-0009-3 |
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| Authors: | Lifeng Cao Lingxia Li Ping Zhang Haitao Wu |
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| Affiliation: | 1. School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China
2. School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China;School of Materials Science and Engineering, University of Jinan, Jinan 250022, China |
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| Abstract: | Ag(Nb_(0.8)Ta_(0.2))O_3 ceramics were prepared by the traditional solid-state reaction method. The effect of CaF_2 addition on the structure and di-electric properties of Ag(Nb_(0.8)Ta_(0.2))O_3 ceramics was investigated. The addition of CaF_2 led the ceramics to a larger grain size and distortion of lattice. With the addition of 4.5 wt.% CaF_2, the permittivity of the ceramics increased from 442 to 1028, the dielectric loss decreased sharply from 6.12×10~(-3) to 8.6×10~(-4), and the temperature coefficient of capacitance decreased from 1834 ppm/℃ to -50 ppm/℃ (at 1 MHz). These results indicated that the high permittivity was related with a large grain size, a low grain boundary density, and the weak Ta-O or Nb-O bond strength caused by the addition of CaF_2. |
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| Keywords: | microwave materials Ag(Nb,Ta)O_3 solid-state reaction method dielectric properties |
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