Projects per year
Abstract
The structure and ionic conductivity of fluorite-related Bi20Ca7NbO39.5, Bi10.75Ca4.375GaO22 and the high temperature form of Bi9ReO17, formed by quenching from 800 C, were studied by neutron powder diffraction, X-ray powder diffraction and impedance spectroscopy. All materials formed distorted delta-Bi2O3-related monoclinic superstructures of a fluorite-related hexagonal subcell. The supercell, with P2(1)/m symmetry, is derived from the cubic fluorite subcell axes (a(f), b(f), c(f)) using the transformation matrix: (graphics). Both Bi20Ca7NbO39.5 and Bi10.75Ca4.375GaO22 are shown to display good oxide ion conductivity (2.52 x 10(-5) Omega(-1) cm(-1) and 1.02 x 10(-5) Omega(-1) cm(-1) at 673 K with activation energies of 1.12 eV and 1.25 eV, respectively): quenched Bi9ReO17 has enhanced oxide ion conductivity (1.44 x 10(-3) Omega(-1) cm(-1) at 673 K) with a lower activation energy of 0.76 eV. (C) 2010 Elsevier B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 1674-1679 |
| Number of pages | 6 |
| Journal | Solid State Ionics |
| Volume | 181 |
| Issue number | 37-38 |
| DOIs | |
| Publication status | Published - 1 Dec 2010 |
Keywords
- Bismuth calcium gallium oxide
- Neutron powder diffraction
- Bismuth oxide
- Bismuth calcium niobium oxide
- Oxide ion conduction
- Bismuth rhenium oxide
Fingerprint
Dive into the research topics of 'The structure and ionic conductivity of the fluorite-related isostructural materials Bi20Ca7NbO39.5, Bi10.75Ca4.375GaO22 and quenched Bi9ReO17'. Together they form a unique fingerprint.Projects
- 1 Finished
-
Characterization and Optimization of New Flourite-related Oxide Ion Conductors
Greaves, C.
Engineering & Physical Science Research Council
1/10/06 → 31/03/10
Project: Research Councils