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Electrical properties and relaxation behavior of Na-doped BaBiNb5O15 ceramics.
- Source :
-
Ceramics International . Jan2022, Vol. 48 Issue 2, p2632-2636. 5p. - Publication Year :
- 2022
-
Abstract
- The electrical performance and relaxation behavior of Na+ doped BaBiNb 5 O 15 compound were investigated. The grain conductivity of the BaBi 0.96 Na 0.04 Nb 5 O 15-δ compound is 4.71 × 10−5 S/cm at 763 K, which is an order of magnitude lower than the parent sample at the same measuring temperature. The highest total conductivity of the BaBi 0.96 Na 0.04 Nb 5 O 15-δ and BaBiNb 5 O 15 sample can reach 1.12 × 10−4 S/cm and 4.0 × 10−5 S/cm at 643 K, respectively, which indicates that the slight Na+ doping can improve the total conductivity. A dielectric relaxation peak related to thermal activation was observed. The activation energy values are E = 0.47 eV for BaBiNb 5 O 15 sample, and E = 0.49 eV for BaBi 0.96 Na 0.04 Nb 5 O 15-δ sample, which indicates that the relaxation activation energy increases with the Bi3+ ions partially replaced by Na+ ions in the BaBiNb 5 O 15 compound. In addition, the oxygen relaxation peak position shifts to the low-frequency direction, which indicates that Na+ ions doping causes the decrease of oxygen vacancy mobility. The lower oxygen vacancy mobility results in the lower grain conductivity in the BaBi 0.96 Na 0.04 Nb 5 O 15-δ sample. After aging for the different time at 773 K, the excellent thermal stability of the BaBi 0.96 Na 0.04 Nb 5 O 15-δ sample can be found. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 48
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 153851652
- Full Text :
- https://doi.org/10.1016/j.ceramint.2021.10.046