| 新钽酸盐Ba3TiTa4O15的结构与介电性能 |
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| 引用本文： | 张辉,方亮,袁润章.新钽酸盐Ba3TiTa4O15的结构与介电性能[J].物理化学学报,2001,17(8):747-749. |
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| 作者姓名： | 张辉 方亮 袁润章 |
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| 作者单位： | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 |
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| 基金项目： | 国家自然科学基金(50002007)及国际衍射数据中心(ICDD)Grant-in-Aid基金(98-10)资助项目 |
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| 摘 要： | 在BaO Ta2O5系统通过掺Ti4＋合成了新钽酸盐Ba3TiTa4O15，用粉晶XRD对其结构进行了分析，并测试了其烧结体的介电特性.结果表明:Ba3TiTa4O15在室温下属于填满型四方钨青铜结构，晶胞参数a=1.256 27(6)nm, c=0.395 86(4)nm; Ba3TiTa4O15在－35 ℃从铁电相转变为顺电相.
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| 关 键 词： | 钽酸盐 钨青铜结构 X射线衍射 介电性能 |
| 收稿时间： | 2000-12-26 |
| 修稿时间： | 2000年12月26 |
Structure and Dielectric Properties of A New Tantalate Ba3TiTa4Ol5 |
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| Zhang Hui,Fang Liang,Yuan Run-Zhang.Structure and Dielectric Properties of A New Tantalate Ba3TiTa4Ol5[J].Acta Physico-Chimica Sinica,2001,17(8):747-749. |
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| Authors: | Zhang Hui Fang Liang Yuan Run-Zhang |
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| Institution: | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 |
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| Abstract: | A tantalate Ba3TiTa4O15 was synthesized by doping Ti4＋ in the binary system BaO Ta2O5. The crystal structure was determined by X ray powder diffraction, and it belongs to paraelectric phase of tetragonal tungsten bronze structure at room temperature with unit cell parameters : a=1.256 27(6)nm, c=0.395 86(4)nm. Dielectric measurements showed that the phase transition of Ba3TiTa4O15 from ferroelectric to paraelectric occurred at －35 ℃, lower than that of Ba6Ti2Nb8O30. The dielectric constant of Ba3TiTa4O15 ceramic was stable at room temperature with the frequency increasing from 1 kHz to 1 MHz, while the dielectric loss was as low as 0.002. Ba3TiTa4O15 might be a suitable candidate for microwave dielectric ceramics. |
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| Keywords: | Tantalate Tungsten bronze structure XRD Dielectric property |
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