Julia Wind
Stability and range of the type II Bi 1−x W x O 1.5+1.5x solid solution
Wind, Julia; Kayser, Paula; Zhang, Zhaoming; Radosavljevic Evans, Ivana; Ling, Chris D.
Authors
Paula Kayser
Zhaoming Zhang
Ivana Radosavljevic Evans
Chris D. Ling
Contributors
Professor Ivana Evans ivana.radosavljevic@durham.ac.uk
Other
Abstract
We have established the stability and range of the cubic type II phase of Bi1 − xWxO1.5 + 1.5x using a combination of X-ray diffraction, neutron diffraction and X-ray absorption spectroscopy. Type II is a high temperature modification that can be obtained by quenching/rapid cooling of samples with compositions between x = 0.148 to x = 0.185. Slower cooling rates yield the stable low temperature polymorph, the tetragonal type Ib phase (Bi rich samples), and mixtures of type Ib and Aurivillius phase (W-rich samples). Throughout the entire solid solution range, type II exhibits a (3 + 3) dimensional incommensurate modulation with modulation vectors slightly smaller than 1/3 based on a cubic fluorite type subcell (δ-Bi2O3). The main structural motifs are well-defined tetrahedra of WO6 octahedra in a δ-Bi2O3-matrix, with additional W being incorporated on corners and face centers of the approximate commensurate 3 × 3 × 3 supercell in octahedral coordination, confirmed by XANES analysis of the W L3-edge. Impedance measurements reveal oxide ionic conductivities comparable to those of yttria-stabilised zirconia even after a decrease in ionic conductivity of about half an order of magnitude on thermal cycling due to transition to the tetragonal type Ib phase.
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 21, 2017 |
Online Publication Date | Jul 28, 2017 |
Publication Date | Oct 1, 2017 |
Deposit Date | Aug 21, 2017 |
Publicly Available Date | Jul 28, 2018 |
Journal | Solid State Ionics |
Print ISSN | 0167-2738 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 308 |
Pages | 173-180 |
DOI | https://doi.org/10.1016/j.ssi.2017.07.015 |
Public URL | https://durham-repository.worktribe.com/output/1351686 |
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http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
© 2017 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
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