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000056545 084__ $$2WoS$$aMaterials Science, Ceramics
000056545 1001_ $$0P:(DE-Juel1)130836$$aMeuffels, P.$$b0$$uFZJ
000056545 245__ $$aPropane gas sensing with high-density SrTi0.6Fe0.4O(3-gamma) ceramics evaluated by thermogravimetric analysis
000056545 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2007
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000056545 440_0 $$03891$$aJournal of the European Ceramic Society$$v27$$x0955-2219
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000056545 520__ $$aSemi-conducting SrTi0.6Fe0.4O(3-delta) in the form of porous thick films might be of interest as a novel material for resistive hydrocarbon sensor applications. As the underlying gas-sensing mechanism is still a matter of question, thermogravimetric analysis was performed on high-density (>= 99%) SrTi0.6Fe0.4O(3-delta) ceramic specimens in order to investigate whether bulk properties are affected by the catalytic oxidation of propane at the material surface. At temperatures 250-400 degrees C, bulk oxygen content was found to significantly decrease upon exposure to traces of propane (0-3000 ppm) in a background of 20% O-2/80% Ar. Lattice oxygen is sufficiently mobile in this compound so that reducing surface reactions are followed by a bulk redox reaction even at low or moderate temperatures. Concomitant changes in the electrical resistance of dense ceramics are consistent with this picture. The hydrocarbon sensitivity of SrTi0.6Fe0.40O(3-delta) artifacts seems thus to a large extent to be correlated to modifications in the bulk defect chemistry of the material. (c) 2006 Elsevier Ltd. All rights reserved.
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000056545 65320 $$2Author$$asintering
000056545 65320 $$2Author$$aperovskites
000056545 65320 $$2Author$$asensors
000056545 65320 $$2Author$$aSr(Ti,Fe)O-3
000056545 65320 $$2Author$$apropane
000056545 773__ $$0PERI:(DE-600)2013983-4$$a10.1016/j.jeurceramsoc.2006.05.078$$gVol. 27, p. 285$$p285$$q27<285$$tJournal of the European Ceramic Society$$v27$$x0955-2219$$y2007
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