TY  - JOUR
AU  - Fantin, Andrea
AU  - Scherb, Tobias
AU  - Seeger, Janka
AU  - Schumacher, Gerhard
AU  - Gerhards, Uta
AU  - Ivanova, Mariya E.
AU  - Meulenberg, Wilhelm A.
AU  - Dittmeyer, Roland
AU  - Banhart, John
TI  - 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)
JO  - Solid state ionics
VL  - 306
SN  - 0167-2738
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2019-03071
SP  - 104 - 111
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000406736300016
DO  - DOI:10.1016/j.ssi.2017.04.005
UR  - https://juser.fz-juelich.de/record/862888
ER  -