Abstract
The I-V characteristics and sensing properties are investigated for an LnMO 3/SnO 2 (Ln = rare earth, M = transition metal) element prepared by mechanically contacting two sintered pellets. For LnCrO 3/SnO 2 and LnCoO 3/SnO 2 definitive non-ohmic curves are obtained. The rectification effect becomes weak on going from LnCrO 3/SnO 2 to LnFeO 3/SnO 2. This could be due to the formation of a p-n junction between LnCrO 3 or LnCoO 3 and SnO 2. For the elements in which part of the Sm 3+ ions in SmMnO 3 and SmCoO 3 were replaced by Sr 2+ ions, the non-ohmic behaviour is more clearly developed than that for the parent perovskite oxide. I-V curves of these elements become ohmic when reducing agents are introduced into the stream of dry air.
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