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000011309 0247_ $$2DOI$$a10.1016/j.ssi.2011.06.012
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000011309 084__ $$2WoS$$aChemistry, Physical
000011309 084__ $$2WoS$$aPhysics, Condensed Matter
000011309 1001_ $$0P:(DE-Juel1)129617$$aIvanova, M.$$b0$$uFZJ
000011309 245__ $$aEffects of A- and B-site (co-)acceptor doping on the structure and proton  conductivity of LaNbO4
000011309 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2012
000011309 300__ $$a45 - 52
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000011309 520__ $$aB-site and A- and B-site co-doped lanthanum niobates, La(1-x)DA(x)Nb(1-y)DB(y)O(4-delta), where D-A stands for Ca or Ba and D-B for Ga, Ge or In (x = 0 or 0.01; y = 0.01), have been synthesized via the solid-state route. Essentially single-phase materials were obtained after 10 h at 1500 degrees C with monoclinic Fergusonite structure at room temperature. The unit cell volume increases slightly with the presence of the acceptor. The electrical conductivity of the materials, characterized as a function of the temperature from 300 degrees C to 900 degrees C under wet reducing conditions with AC impedance spectroscopy, was dominated by protons. The maximum conductivity of 4.1 . 10(-4) S . cm(-1) at 900 degrees C was obtained for La0.99Ca0.01Nb0.99Ga0.01O4-delta, which is a factor of similar to 2.5 lower than the highest conductivity reported for the A-site Ca-doped LaNbO4. Based on a semi-quantitative evaluation it was shown that the hydration of the B-site and A- and B-site co-doped LaNbO4, is slightly more exothermic and that the proton mobility has higher activation enthalpies than Ca-doped LaNbO4. This is accounted for by a stronger association between the acceptor and the proton for B-site than for A-site doping. (c) 2011 Elsevier B.V. All rights reserved.
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000011309 65320 $$2Author$$aProton-conducting ceramic materials
000011309 65320 $$2Author$$aRare earth ortho-niobates
000011309 65320 $$2Author$$aAcceptor-doped lanthanum niobate
000011309 7001_ $$0P:(DE-Juel1)VDB94482$$aRicote, S.$$b1$$uFZJ
000011309 7001_ $$0P:(DE-Juel1)129637$$aMeulenberg, W. A.$$b2$$uFZJ
000011309 7001_ $$0P:(DE-Juel1)VDB94483$$aHaugsrud, R.$$b3$$uFZJ
000011309 7001_ $$0P:(DE-Juel1)129815$$aZiegner, M.$$b4$$uFZJ
000011309 773__ $$0PERI:(DE-600)1500750-9$$a10.1016/j.ssi.2011.06.012$$gVol. 213, p. 45 - 52$$p45 - 52$$q213<45 - 52$$tSolid state ionics$$v213$$x0167-2738$$y2012
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