物理化学学报 >> 2001, Vol. 17 >> Issue (08): 747-749.doi: 10.3866/PKU.WHXB20010816

研究简报 上一篇    下一篇

新钽酸盐Ba3TiTa4O15的结构与介电性能

张辉;方亮;袁润章   

  1. 武汉理工大学 材料复合新技术国家重点实验室, 武汉 430070
  • 收稿日期:2000-12-26 修回日期:2001-02-26 发布日期:2001-08-15
  • 通讯作者: 方亮 E-mail:fangliang001@263.net

Structure and Dielectric Properties of A New Tantalate Ba3TiTa4O15

Zhang Hui;Fang Liang;Yuan Run-Zhang   

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070
  • Received:2000-12-26 Revised:2001-02-26 Published:2001-08-15
  • Contact: Fang Liang E-mail:fangliang001@263.net

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.

关键词: 钽酸盐, 钨青铜结构, X射线衍射, 介电性能

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.

Key words: Tantalate, Tungsten bronze structure, XRD, Dielectric property