%0 Journal Article
%A Seeger, J.
%A Ivanova, Mariya
%A Meulenberg, W. A.
%A Sebold, D.
%A Stöver, D.
%A Scherb, T.
%A Schumacher, G.
%A Escolástico, S.
%A Solís, C.
%A Serra, J. M.
%T Synthesis and Characterization of Nonsubstituted and Substituted Proton-Conducting La6−xWO12−y
%J Inorganic chemistry
%V 52
%N 18
%@ 0020-1669
%C Washington, DC
%I American Chemical Society
%M FZJ-2013-06125
%P 10375−10386
%D 2013
%X Mixed proton−electron conductors (MPEC) can be used as gas separation membranes to extract hydrogen from a gas stream, for example, in a power plant. From the different MPEC, the ceramic material lanthanum tungstate
%X presents an important mixed protonic−electronic conductivity. Lanthanum tungstate La6−xWO12−y (with y = 1.5x + δ and x =0.5−0.8) compounds were prepared with La/W ratios between 4.8 and 6.0 and sintered at temperatures between 1300 and 1500 °C in order to study the dependence of the single-phase formation region on the La/W ratio and temperature.
%X Furthermore, compounds substituted in the La or W position were prepared. Ce, Nd, Tb, and Y were used for partial substitution at the La site, while Ir, Re, and Mo were applied for W substitution. All substituents were applied in different concentrations. The electrical conductivity of nonsubstituted La6−xWO12−y and for all substituted La6−xWO12−y compounds was measured in the temperature range of 400−900 °C in wet
%X (2.5% H2O) and dry mixtures of 4% H2 in Ar. The greatest improvement in the electrical characteristics was found in the case of 20 mol % substitution with both Re and Mo. After treatment in 100% H2 at 800 °C, the compounds remained unchanged as confirmed with XRD, Raman, and SEM.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000330098300023
%$ pmid:24000891
%R 10.1021/ic401104m
%U https://juser.fz-juelich.de/record/140888