Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1610728 | Journal of Alloys and Compounds | 2014 | 6 Pages |
Abstract
W/Cr co-doped BIT (BTWC) ceramics {Bi4Ti3âxWxO12+x + 0.25 wt% Cr2O3 (x = 0-0.1)} with a strong ferroelectricity and a high electrical resistivity were prepared by a conventional ceramic process, and effects of W doping content on their crystalline structures, ferroelectric properties and electrical conduction characteristics were also explored. By the co-doping of W/Cr, the crystallographic evolution happened in BTWC ceramics, and then the degree of the lattice distortion of BTWC ceramics decided on their spontaneous polarization and influenced their electrical resistivity. Moreover, both the increased applied field and measurement temperature can improve the Pr. The great improvement in remanent polarization and resistivity of BTWC ceramics were mainly attributed to the decreased concentration of oxygen vacancies by doping W6+. The Bi4Ti2.95W0.05O12.05 + 0.25 wt% Cr2O3 ceramic possessed a large Pr of 16 μC/cm2 and a high Ïdc (600 °C) of 2.94 Ã 106 Ω cm, respectively, which makes it a promising candidate for high-temperature applications.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Yu Chen, Zhihang Pen, Qingyuan Wang, Jianguo Zhu,