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Oxide Ion Conductivity in the Hexagonal Perovskite Derivative Ba3MoNbO8.5
Sacha Fop1, Janet M S Skakle1, Abbie C McLaughlin1
1The Chemistry Department, University of Aberdeen , Meston Walk, Aberdeen AB24 3UE, U.K.
Journal of the American Chemical Society
|December 16, 2016
Summary
Researchers discovered a new hexagonal perovskite derivative, Ba3MoNbO8.5, which exhibits excellent oxide ion conductivity. This finding opens new avenues for designing advanced oxygen conducting electrolytes for energy applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
Background:
- Oxide ion conductors are crucial for solid oxide fuel cells and electrolyzer cells.
- Developing new materials with enhanced ionic conductivity is essential for improving energy conversion efficiency.
Purpose of the Study:
- To investigate the crystal structure and electrical properties of the hexagonal perovskite derivative Ba3MoNbO8.5.
- To explore the potential of this new material as an oxide ion conductor.
Main Methods:
- Crystallographic analysis to determine the structure of Ba3MoNbO8.5.
- Electrical conductivity measurements over a range of temperatures and oxygen partial pressures.
Main Results:
- Ba3MoNbO8.5 crystallizes in a unique hexagonal perovskite structure with disordered octahedra and tetrahedra.
- The material exhibits predominantly oxide ion conduction with a bulk conductivity of 2.2 × 10-3 S cm-1 at 600 °C.
- It shows a wide stability range across various oxygen partial pressures.
Conclusions:
- Ba3MoNbO8.5 represents a new family of hexagonal perovskite derivatives with promising oxide ion conductivity.
- The mixed tetrahedral and octahedral geometry in this structure is key to its ionic conduction properties.
- Further research into similar structures could lead to novel oxygen conducting electrolytes for energy devices.
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