高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (9): 1552.

• 研究快报 • 上一篇    下一篇

类钙钛矿新铌酸盐Ba3La2Ti2Nb2O15的合成、结构与介电特性

张辉, 方亮, 洪学鵾, 孟范成, 刘韩星, 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:2003-04-15 出版日期:2003-09-24 发布日期:2003-09-24
  • 通讯作者: 方亮(1970年出生),男,博士,教授,从事无机功能材料的合成、结构与性能研究.E-mail:fangliang001@263.net E-mail:fangliang001@263.net
  • 基金资助:

    国家自然科学基金(批准号:50002007);教育部重大项目(批准号:0201);国际衍射数据中心(ICDD)Grant-in-Aid基金(批准号:02-05)

Synthesis,Structure and Dielectric Properties of a New Pervoskite-related Niobate Ba3La2Ti2Nb2O15

ZHANG Hui, FANG Liang, HONG Xue-Kun, MENG Fan-Cheng, LIU Han-Xing, YUAN Run-Zhang   

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
  • Received:2003-04-15 Online:2003-09-24 Published:2003-09-24

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摘要： 为满足现代通信技术的小型化、集成化与高可靠性的迫切要求,探索具有高介电常数、低介电损耗与低温度系数的微波介电材料引起了材料科学、化学、物理和电子学等领域科学工作者的广泛关注,并已开发出复合钙钛矿结构[Ba(Zn1/3Ta2/3)O3]和钨青铜结构[Ba6-3xLn8+2xTi18O54]等实用化的高性.

关键词: 铌酸盐, 类钙钛矿结构, 介电特性

Abstract: A new niobate Ba3La2Ti2Nb2O15was synthesized by high temperature solid state reaction in the BaO-La2O3-TiO2-Nb2O5system. The chemical compositions, crystal structure, microstructure, density and melting point of the new compound were characterized by EPMA, XRD, SEM, DTA and so on. Ba3La2Ti2Nb2O15crystallizes in the hexagonal system with unit cell parameters a=0. 5682(1) nm, c=-1.1657(1) nm, and space group P3 m1, Z=l. The structure may be described as four (Nb,Ti)O6octa-hedra corner-sharing to form hexagonal perovskite layer, while Ba or La occupying the interstices. The Ba3La2Ti2Nb2O15ceramic exhibits a high dielectric constant of 90. 04, a low dielectric loss of 4. 5 × 10-4and a small temperature coefficient of dielectric constant of -65 × 10-6K-1at 1 MHz due to its close structure and relative high dielectric polarizabilities of Ba2+, La3+, Ti4+and Nb5+. Ba3La2Ti2Nb2O15might be a suitable candidate of high er microwave dielectric ceramics.

Key words: Niobate, Perovskite-related structure, Dielectric property

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