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- Title
Giant dielectric and low voltage varistor behaviors of Ba-doped BiNaCuTiO ceramics.
- Authors
Qiu, Y.; Ma, Z.; Huo, S.; Duan, H.; Tian, Z.; Yuan, S.; Chen, L.
- Abstract
BiNaBaCuTiO (x = 0, 0.025, 0.05, 0.075) polycrystalline ceramics are prepared by a modified Pechini method. Effect of Ba doping on the dielectric and nonlinear electrical behaviors are investigated in detail. All the samples exhibit giant dielectric effect and nonlinear electrical behavior. Compared with BiNaCuTO ceramics, the permittivity drops down and the nonlinear electrical behavior shifts to low voltage area by Ba doping. The permittivity reduces from 20,004 to 7,006 at 1 kHz. The breakdown voltage and nonlinear coefficient values decrease to 10.8 V/mm and 1.5, respectively. Additionally, the electrostatic barrier height drops down to 0.66 eV. Giant dielectric response and nonlinear electrical behavior can be interpreted in terms of internal barrier layer capacitors model. These results imply that Ba substitution can adjust the dielectric and nonlinear electrical behaviors of BiNaCuTO ceramics, which is a promising candidate for low voltage varistor materials.
- Subjects
DIELECTRICS; VARISTORS; CERAMICS; BARIUM compounds; PERMITTIVITY; LOW voltage systems
- Publication
Journal of Materials Science: Materials in Electronics, 2012, Vol 23, Issue 8, p1587
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-012-0633-9