| 钨青铜结构Ba6Zn0.67M9.33O30(M=Nb,Ta)的合成与介电特性 |
| Synthesis and Dielectric Properties of Tungsten Bronze Structure Compounds Ba6Zn0.67M9.33O30(M=Nb,Ta) |
| 作者 | 单位 | | 方亮 | 武汉理工大学材料复合新技术国家重点实验室,武汉,430070 | | 杨俊峰 | 武汉理工大学材料复合新技术国家重点实验室,武汉,430070 | | 黄涛华 | 武汉理工大学材料复合新技术国家重点实验室,武汉,430070 | | 张辉 | 武汉理工大学材料复合新技术国家重点实验室,武汉,430070 | | 刘韩星 | 武汉理工大学材料复合新技术国家重点实验室,武汉,430070 |
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| 摘要: |
| 关键词: 钨青铜结构 介电特性 X射线衍射 弛豫性铁电体 |
| 基金项目: |
| Abstract: Two compounds Ba6Zn0.67M9.33O3 and Ba6Zn0.67M9.33O30 with tungsten bronze structure were synthesized in the BaO-ZnO-Nb2O5/Ta2O5 systems by the conventional high temperature solid-state reaction.The structure and dielectric properties of Ba6Zn0.67M9.33O3 and Ba6Zn0.67M9.33O30 were determined by X-ray powder diffraction,scanning electron microscope and dielectric measurements.The results show that Ba6Zn0.67M9.33O30 belongs to paraelectric phase of fully filled tetragonal tungsten bronze structure at room temperature with unit cell parameters a:1.26256(4) nm, c:0.39698(2) nm. The room temperature dielectric constant (ε) of Ba6Zn0.67M9.33O30 ceramic reached 108 combined with a low dielectric loss of 0.005 at 1 MHz. While Ba6Zn0.67M9.33O3 belongs to fully filled tetragonal tungsten bronze structure at room temperature with the unit cell parameters a:1.25940 (3) nm, c=0.40008(2) nm. Ba6Zn0.67M9.33O30 ceramic shows significant relaxor behaviors, and the phase transition from ferroelectric to paraelectric occurred at 55℃ (at 1 MHz). The room temperature dielectric constant (ε) of ceramic reached 570 at 1 MHz. |
| Keywords: tungsten bronze structure dielectric property XRD relaxor ferroele ctrics |
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| 方亮,杨俊峰,黄涛华,张辉,刘韩星.钨青铜结构Ba6Zn0.67M9.33O30(M=Nb,Ta)的合成与介电特性[J].无机化学学报,2004,20(1):111-114. |
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