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Enhancing Pr1-xBaxMnO3-δ perovskite charge-transport by electronic structure modulation.
- Source :
- Journal of Materials Science; Oct2021, Vol. 56 Issue 29, p16510-16523, 14p, 3 Diagrams, 2 Charts, 4 Graphs
- Publication Year :
- 2021
-
Abstract
- Research has shown half (Pr<subscript>0.5</subscript>Ba<subscript>0.5</subscript>MnO<subscript>3-δ</subscript>) perovskite to exhibit good electronic and magnetic properties. However, it is necessary to clarify whether electronic transport originates in the cubic or hexagonal phase. This paper explores Ba-doped Pr<subscript>1-x</subscript>Ba<subscript>x</subscript>MnO<subscript>3-δ</subscript> (x = 0.35, 0.4, 0.45 and 0.5) disordered perovskites with mixed valence states. The cubic-phase transition increases when the EDTA sol–gel synthesis method was used. Electrical conductivity studies demonstrate that cubic P m 3 ¯ m space group symmetry with a little number of oxygen vacancies enhances conductivity. The origin of this process has been explained in terms of the transition from Mn<superscript>4+</superscript> → Mn<superscript>3+</superscript> ions forming hopping sites for electrons/holes. Rietveld refinement, HRTEM, and XPS confirm a complete structure transition to single cubic perovskite. Charge carrier transport clarifies that the cubic perovskite structure enhances the electrical conductivity more effectively than their cubic/hexagonal mixture counterparts. Our results suggest that the activation energy for electron transport is independent of symmetry but not of Pr<superscript>3+</superscript> concentration. Electrical conductivity increases up to twice as much (182 Scm<superscript>−1</superscript>) suggested by previously published research, ratifying its potential application as a cathode for SOFC. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 56
- Issue :
- 29
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 151861679
- Full Text :
- https://doi.org/10.1007/s10853-021-06332-z