A new electrolyte based on Tm3 +-doped δ-Bi2O3-type phase with enhanced conductivity(Article)
- aFaculty of Technology and Metallurgy, Department of General and Inorganic Chemistry, University of Belgrade, Karnegijeva 4, Belgrade 11000, Serbia
- bInstitute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1a, Belgrade 11000, Serbia
- cDepartment of Materials Science and Engineering, Texas AandM University, 3003 TAMU, College Station, TX 77843, United States
Abstract
The possibility to stabilize the δ-Bi2O3-type polymorph with high ionic conductivity by doping with Tm2O3 was investigated in this study. Five microcrystalline samples were synthesized at 750 °C from α-Bi2O3 and Tm2O3 mixtures with compositions (Bi1-xTmx)2O3, where x = 0.04, 0.08, 0.11, 0.14 and 0.20. The XRD, SEM, HRTEM and SAED results showed that the targeted δ-Bi2O3-type single-phase (space group Fm3¯m) was formed for 0.11 ≤ x ≤ 0.20. The unit cell parameter of δ-Bi2O3-type phase decreases with increase in Tm content. According to DTA, no phase transitions were observed in the sample with x = 0.20, indicating that the obtained δ-Bi2O3-type phase is structurally stable from room temperature to 985 °C. Based on EIS, (Bi0.80Tm0.20)2O3 exhibits high conductivity (0.117 S cm-1 at 550 °C) with activation energies: 0.38(4) eV above 550 °C and 1.27(2) eV below 550 °C, due to the change in charge carrier mobility. The effect of thermal aging was investigated and discussed. © 2015 Elsevier B.V.
Indexed keywords
| Engineering controlled terms: | Activation energyConvergence of numerical methodsElectrolytesSolid electrolytesSolid oxide fuel cells (SOFC)Thermal agingThulium compounds |
|---|---|
| Engineering uncontrolled terms | Enhanced conductivityHigh conductivityMicrocrystalline samplesNew electrolytesOxide ion conductorsSingle phaseSpace GroupsUnit cell parameters |
| Engineering main heading: | Bismuth compounds |
Funding details
| Funding sponsor | Funding number | Acronym |
|---|---|---|
| Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja | 45007,III 45007 | MPNTR |
| National Science Foundation See opportunities by NSF | DMR-1057155 | NSF |
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1
The authors gratefully acknowledge the financial support of the Ministry of Education, Science and Technological Development of the Republic of Serbia (grant no. III 45007 ) and the U.S. National Science Foundation (grant no. DMR-1057155 ). The authors also show gratitude to Dr. Shujuan Wang from Texas A&M University for her help with HRTEM.
- ISSN: 01672738
- CODEN: SSIOD
- Source Type: Journal
- Original language: English
- DOI: 10.1016/j.ssi.2015.08.004
- Document Type: Article
- Publisher: Elsevier B.V.
Dapčević, A.; Faculty of Technology and Metallurgy, Department of General and Inorganic Chemistry, University of Belgrade, Karnegijeva 4, Belgrade, Serbia;
© Copyright 2019 Elsevier B.V., All rights reserved.
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