Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 14, Pages 16842-16847Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.05.226
Keywords
Dielectric properties; Temperature stability; XRD refinement; Impedance spectroscopy
Categories
Funding
- National Natural Science Foundation of China [51802140]
- Scientific Research Fund of Jiangxi Provincial Education Department [GJJ180547, DA201803145]
Ask authors/readers for more resources
Ceramic-based dielectrics are considered as the best candidates for high temperature capacitors because of their outstanding mechanical and electrical properties. Nevertheless, conventional barium titanate-based capacitors show narrow operating temperature ranges owing to the low tetragonal-cubic phase transition temperature. In order to increase the working temperature and relative permittivity, a novel (1-x)Na0.5K0.5NbO3- xLa(Zn0.5Ti0.5)O-3 (NKN-xLZT) ceramics were chosen to meet the targets in this work. The NKN-xLZT ceramics with sub-micrometer grains (0.2-0.4 mu m) were synthesized via a conventional solid-state sintering route. A relative permittivity (epsilon' = 1560 +/- 15%) with low loss tangent over wide temperature range from 96 degrees C to 350 degrees C was obtained in the x = 0.02 ceramics. Additionally, the crystal structure distortion and conduction behaviors of the NKN-xLZT ceramics were systematically studied. The decrease of oxygen octahedron distortion induced a weak polarization, and the high resistance (9 x 10(6) Omega cm at 400 degrees C) greatly suppressed the long-term migration of defective ions in the ceramics. Therefore, the low loss tangent and high permittivity were still stabilized at the high temperature. It believes that the NKN-xLZT ceramic system in this work will become one of the most promising candidates for high-temperature capacitor devices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available