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| Hauptseite > Publikationsdatenbank > Relation between composition and vacant oxygen sites in the mixed ionic-electronic conductors La 5.4 W 1−y M y O 12−δ ( M = Mo, Re; 0 ≤ y ≤ 0.2) and their mother compound La 6−x WO 12−δ (0.4 ≤ x ≤ 0.8) |
| Hauptseite > Publikationsdatenbank > Relation between composition and vacant oxygen sites in the mixed ionic-electronic conductors La 5.4 W 1−y M y O 12−δ ( M = Mo, Re; 0 ≤ y ≤ 0.2) and their mother compound La 6−x WO 12−δ (0.4 ≤ x ≤ 0.8) |
| Journal Article | FZJ-2019-03071 |
; ; ; ; ; ; ; ;
2017
Elsevier Science
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.ssi.2017.04.005
Abstract: A detailed analysis of specimen composition, water uptake and their interrelationship in the systems La6-xWO12-δ(0.4≤x≤0.8) and La6-xW1-yMyO12-δ(0≤y≤0.2;M= Mo, Re) is presented. The three specimen series wereinvestigated in dry and wet (D2O) conditions. A systematic trend in mass loss and onset temperature variationwas observed in La6-xWO12-δ(0.4≤x≤0.8). Even very small amounts (< 1 wt%) of secondary phases werefound to notably modify the specimen's water uptake and onset temperature of mass loss. The theoretical modelfor vacancy concentration available was used to calculate the vacant oxygen sites starting from mass loss valuesdetermined by thermogravimetry. A discrepancy between the calculated and observed concentration of vacantoxygen sites is observed for all three systems. The effect of substitution of W by Re or Mo on the vacancy amountis explained taking into account diffraction measurements and information on the oxidation state of thesubstituting elements Mo and Re.
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