FeTiNbO6金红石型陶瓷的结构和介电弛豫行为研究

doi:10.3724/SP.J.1077.2014.12756

无机材料学报 ›› 2014, Vol. 29 ›› Issue (1): 57-61.DOI: 10.3724/SP.J.1077.2014.12756

FeTiNbO₆金红石型陶瓷的结构和介电弛豫行为研究

王赛，侯育冬，郑木鹏，段成辉，朱满康，严辉

(北京工业大学材料科学与工程学院, 北京100124)

收稿日期:2012-12-14 修回日期:2013-02-25 出版日期:2014-01-20 网络出版日期:2013-12-09
作者简介:王赛(1989-), 女, 硕士研究生. E-mail: wangsai2178@emails.bjut.edu.cn
基金资助:
国家自然科学基金(51172006, 51072008); 北京市自然科学基金(2102006, 2132007)

Structure and Dielectric Relaxation Behavior of Rutile-type FeTiNbO₆ Ceramics

WANG Sai, HOU Yu-Dong, ZHENG Mu-Peng, Duan Cheng-Hui, ZHU Man-Kang, YAN Hui

(College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China)

Received:2012-12-14 Revised:2013-02-25 Published:2014-01-20 Online:2013-12-09
About author:WANG Sai. E-mail: wangsai2178@emails.bjut.edu.cn
Supported by:
National Natural Science Foundation of China (51172006, 51072008); Natural Science Foundation of Beijing (2102006, 2132007)

摘要/Abstract

摘要： 采用固相合成法制备出致密的FeTiNbO₆陶瓷, 研究了材料的相结构与电学行为。结果显示, 样品为四方金红石结构, 晶胞参数a = b = 0.4652 nm, c = 0.3013 nm。相对于纯金红石型TiO₂, FeTiNbO₆陶瓷晶格畸变增大, 诱发体系出现铁电行为。此外, 样品呈现弥散相变与频率色散现象, 这与金红石结构中等同八面体中心位不等价离子的占据相关。样品的直流电导率主要来源于氧空位的电离与迁移, 其转变点靠近相变区域。研究表明FeTiNbO₆是一种具有应用潜力的新型无铅弛豫铁电体。

关键词: FeTiNbO₆, 金红石结构, 弥散相变, 弛豫性

Abstract: The dense FeTiNbO₆ ceramics were prepared through a solid-state method. The phase structure and electrical behavior were investigated in detail. The results reveal that FeTiNbO₆ are tetragonal rutile structure, and the refined lattice parameters are a=b=0.4652 nm and c=0.3013 nm. Compared with pure TiO₂ rutile, the larger crystalline distortion in FeTiNbO6 ceramics induces emergence of ferroelectric behaviour. Due to the equivalent occupations of heterovalent ions in the octahedral center, the FeTiNbO₆ ceramics show the dielectric relaxation phenomena of diffuse phase transition and frequency dispersion. The dc conductivity of the sample comes mainly from the ionization and migration of oxygen vacancies, and the transition point is close to the phase transition region. The results indicate that FeTiNbO₆ ceramics are promising candidates for lead-free ferroelectric relaxor.

Key words: FeTiNbO₆, rutile-type, diffuse phase transition, relaxation behavior

中图分类号:

TM22

王赛，侯育冬，郑木鹏，段成辉，朱满康，严辉. FeTiNbO₆金红石型陶瓷的结构和介电弛豫行为研究[J]. 无机材料学报, 2014, 29(1): 57-61.

WANG Sai, HOU Yu-Dong, ZHENG Mu-Peng, Duan Cheng-Hui, ZHU Man-Kang, YAN Hui. Structure and Dielectric Relaxation Behavior of Rutile-type FeTiNbO₆ Ceramics[J]. Journal of Inorganic Materials, 2014, 29(1): 57-61.

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FeTiNbO₆金红石型陶瓷的结构和介电弛豫行为研究

Structure and Dielectric Relaxation Behavior of Rutile-type FeTiNbO₆ Ceramics

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