Sensing Behavior of Vanadates and Molybdates under Low Oxygen Partial Pressures at 1,000℃

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Vanadate and molybdate ceramics reproducibly showed a drastic reduction of electrical resistivity over 108 (\Omega\ten\cm) or more under the oxygen partial pressure ranging 10-11\sim\10-17 (atm) at 1000\C\. This large step-wise change in resistivity was found to arise from the phase transition between the insulating phases as AMO4 (A=Ba, Sr, La, Sm, Y; M=V, Mo) and the high conducting phases as AMO3. Use of these oxides for fabrication of oxygen sensors or calibrating materials for a zirconia cell was discussed.

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