| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5438302 | Ceramics International | 2017 | 20 Pages |
Abstract
BaTiO3 is a typical ceramic with a positive temperature coefficient of resistivity (PTC). The grain conductivity of BaTiO3 is associated with doping, and the grain boundary plays an important role in the PTC effect. In this study, Ba0.99Y0.01TiO3-0.001MnO-xTiO2 (x=0.01-0.07) ceramics were synthesized by the conventional solid-state reaction method in air atmosphere. The influence of excess TiO2 on the crystal structure, microstructure, binding energy and the PTC characteristics were investigated by XRD, SEM, EDS, XPS and impedance spectroscopy, respectively. The results showed that excellent room-temperature resistivity and resistance jump ratio (Rmax/Rmin) up to 84 Ω cm and 1.6Ã105 could be obtained possibly associated with the two different roles played by Ti ions at the grain boundaries.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Maolin Zhang, Xuan Ji, Zhimin Li, Zi Yang, Yangxi Yan, Yunxia Huang, Jinbiao Pang,