Journal Article

PreJuSER-56545

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Propane gas sensing with high-density SrTi0.6Fe0.4O(3-gamma) ceramics evaluated by thermogravimetric analysis

Meuffels, P.FZJ*

2007
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jeurceramsoc.2006.05.078

Abstract: Semi-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.

Keyword(s): J ; sintering (auto) ; perovskites (auto) ; sensors (auto) ; Sr(Ti,Fe)O-3 (auto) ; propane (auto)

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Elektronische Materialien (IFF-6)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2007

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