| 熔盐法制备Ca0.9La0.2/3Cu3Ti4O12陶瓷粉体及其介电性能研究 |
| Preparation and Dielectric Properties of Ca0.9La0.2/3Cu3Ti4O12 Ceramic Powders by Molten Salt Methods |
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| 摘要: 以CaCO3，CuO，TiO2，La2O3为反应物，NaCl，KCl为熔盐，通过熔盐法分别在700、750、800、850 ℃条件下合成Ca0.9La0.2/3Cu3Ti4O12陶瓷粉体。利用XRD和SEM分别对陶瓷粉体的物相结构和微观形貌进行了分析，并对其介电性能进行了测试。实验结果表明，随着合成温度的升高，陶瓷粉体的钙钛矿相含量逐渐增大，与传统固相法相比，熔盐法制备的粉体无团聚现象，耗时少。Ca0.9La0.2/3Cu3Ti4O12粉体制备的陶瓷在1 000 ℃烧结、测试频率在100 Hz~10 kHz时，获得优良的介电性能：介电常数大大超过104，介电损耗在0.1~0.47之间。 |
| 关键词: 熔盐法 Ca0.9La0.2/3Cu3Ti4O12 陶瓷粉体 介电性能 |
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| Abstract: The perovskite Ca0.9La0.2/3Cu3Ti4O12 powders were prepared by a molten salt method at 700, 750, 800, 850 ℃, with raw materials of CaCO3, CuO, TiO2 and La2O3 in NaCl and KCl flux salts. The phase structure, microstructure and the dielectric properties of the Ca0.9La0.2/3Cu3Ti4O12 ceramics were investigated. The results show that the perovskite(%) increased with the increasing temperature. Pure perovskite phase Ca0.9La0.2/3Cu3Ti4O12 powders were successfully synthesized by molten-salt method in NaCl-KCl flux at a low temperature of 750 ℃ for 3 h, which is 250 ℃ lower than that of the conventional solid-state reaction. Compared to the solid mixed oxide process, the molten salt synthesis was a better method for obtaining powders without aggregation in less time. At the sintering temperature of 1 000 ℃, the Ca0.9La0.2/3Cu3Ti4O12 ceramics made from powders exhibited giant dielectric constants(>104), accompanied by low dielectric loss between 0.1~0.47 in the range of 100 Hz~10 kHz. |
| Keywords: molten salt method Ca0.9La0.2/3Cu3Ti4O12 ceramic powders dielectric property |
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| 摘要点击次数: 1465 |
| 全文下载次数: 1988 |
| 王茂华,王秋丽,姚 超.熔盐法制备Ca0.9La0.2/3Cu3Ti4O12陶瓷粉体及其介电性能研究[J].无机化学学报,2012,28(4):727-732. |
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