| Title of Article |
Effect of Zn 2+ and Nb 5+ co-doping ions on giant dielectric properties of rutile-TiO 2 ceramics |
| Date of Acceptance |
14 August 2017 |
| Journal |
| Title of Journal |
Ceramics International |
| Standard |
SCOPUS |
| Institute of Journal |
2015 Elsevier B.V. All rights reserved |
| ISBN/ISSN |
0272-8842 |
| Volume |
2017 |
| Issue |
43 |
| Month |
december |
| Year of Publication |
2017 |
| Page |
15466-15471 |
| Abstract |
The dielectric properties of Zn²⁺ and Nb⁵⁺ co-doped rutile-TiO2 (ZNTO) ceramics with various dopant concentrations prepared by a solid state reaction method are investigated. Highly dense microstructure and homogeneous dispersion of co-dopants are achieved in all sintered ZNTO ceramics. The presence of Ti³⁺ and oxygen vacancies is confirmed using X-ray photoelectron spectroscopy. By optimizing dopant concentration, greatly enhanced dielectric permittivity of ≈5×10⁴ and very low dielectric loss tangents of ≈0.03 at a low frequency are achieved. Impedance spectroscopy analysis reveals that the ZNTO ceramics are electrically heterogeneous, consisting of semiconducting and insulating phases. The low-frequency dielectric permittivity and dielectric loss tangent increase with increasing co-dopant concentration, corresponding to the enhancement of free charge carriers inside the grains and a decrease in the total resistance of the insulating phases, respectively. The giant dielectric properties should be associated with the interfacial polarization at internal insulating barriers. |
| Keyword |
XPSTiO2Giant dielectric permittivityColossal dielectric permittivityLoss tangentImpedance spectroscopy |
| Author |
|
| Reviewing Status |
มีผู้ประเมินอิสระ |
| Status |
ตีพิมพ์แล้ว |
| Level of Publication |
นานาชาติ |
| citation |
true |
| Part of thesis |
true |
| Attach file |
|
| Citation |
0
|
|
|
Publication
Journal Publication
ไทย