Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 32, Pages 12630-12641Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00546e
Keywords
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Funding
- Research Council of Norway [187160, 193816, 190901, 171157, 191346, nn4604k]
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The present review focuses on characteristics of lanthanum tungstate in the compositional region 25-30 mol% La2O3 in the La2O3-WO3 phase diagram. These tungstates represent an interesting family of materials for technological applications being proton or mixed proton-electron conductors depending on conditions. The material family was traditionally identified as La6WO12. However, recent efforts have shown that lanthanum tungstate can more correctly be represented by the formula La28-xW4+xO54+delta, where nearly one tungsten (x similar to 1) dissolves in lanthanum sites to form a stable composition. In the present contribution, the importance of the crystal structure and the effect of the La/W ratio on stability, defect chemistry and, accordingly, transport properties of this material are reviewed. A revisited phase diagram in this compositional region is presented. Reported doping strategies on both the A- and B-sites are discussed in view of the applicability of these materials as dense ceramic H-2 separation membranes.
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