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000140888 1001_ $$0P:(DE-Juel1)128526$$aSeeger, J.$$b0$$eCorresponding author$$ufzj
000140888 245__ $$aSynthesis and Characterization of Nonsubstituted and Substituted Proton-Conducting La6−xWO12−y
000140888 260__ $$aWashington, DC$$bAmerican Chemical Society$$c2013
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000140888 520__ $$aMixed 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
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.
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
(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.
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000140888 7001_ $$0P:(DE-Juel1)129617$$aIvanova, Mariya$$b1$$ufzj
000140888 7001_ $$0P:(DE-Juel1)129637$$aMeulenberg, W. A.$$b2$$ufzj
000140888 7001_ $$0P:(DE-Juel1)129662$$aSebold, D.$$b3$$ufzj
000140888 7001_ $$0P:(DE-Juel1)129666$$aStöver, D.$$b4$$ufzj
000140888 7001_ $$0P:(DE-HGF)0$$aScherb, T.$$b5
000140888 7001_ $$0P:(DE-HGF)0$$aSchumacher, G.$$b6
000140888 7001_ $$0P:(DE-HGF)0$$aEscolástico, S.$$b7
000140888 7001_ $$0P:(DE-HGF)0$$aSolís, C.$$b8
000140888 7001_ $$0P:(DE-HGF)0$$aSerra, J. M.$$b9
000140888 773__ $$0PERI:(DE-600)1484438-2$$a10.1021/ic401104m$$n18$$p10375−10386$$tInorganic chemistry$$v52$$x0020-1669$$y2013
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