| Autor: |
Raengthon, Natthaphon, Rujijanagul, Gobwute, Cann, David P. |
| Předmět: |
|
| Zdroj: |
Journal of Applied Physics; 2018, Vol. 124 Issue 15, pN.PAG-N.PAG, 5p, 6 Graphs |
| Abstrakt: |
Improvement of dielectric properties and insulation resistance are important for the development of high-performance dielectric materials. Various techniques can be used in order to improve the performance of such materials. The effect of A-cation deficiency on the electrical properties of barium strontium titanate ceramics is an interesting topic of investigation. Thus, this study examined the stoichiometric, 0.01 mol Ba-deficient, and 0.01 mol Sr-deficient compositions of (Ba0.8Sr0.2)TiO3 ceramics. Changes in the dielectric characteristics were observed in the 0.01 mol Ba-deficient and 0.01 mol Sr-deficient compositions. The characteristics of electrical conduction revealed by impedance analysis are different at high temperatures when Ba-deficiency and Sr-deficiency are introduced to the dielectrics. The Ti4+ state for the Ba-deficient composition is maintained. However, the Ti4+ state partially changes to the Ti3+ state, giving rise to the polaron hopping conduction process for Sr-deficient composition. Therefore, this study shows that a minor deviation of the A-cation from stoichiometry can induce a different conduction process while maintaining the dielectric permittivity characteristics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
