Evaluation of SrTi1-yNbyO3+delta materials for gas sensors

Porous samples were used to evaluate the dependence of electrical conductiv ity on the oxygen partial pressure. Results obtained with these porous samp les revealed that Nb for Ti substitution suppresses the p-type contribution even in oxidizing conditions, and enhances the n-type conductivity. The co nductivity of porous SrTi1-yNbyO3+delta samples can be described by the pow er law dependence on p(O2)(-1/4), except possibly in very reducing conditio ns. The response time of porous samples is short, as required for resistive oxygen sensors. (C) 1999 Elsevier Science S.A. All rights reserved.