A New Oxygen Sensor Based on the Thermoelectric Power of Solid Solutions of Nb2O5 and Bi2O3

One part of Nb2O5 to 60 parts of Bi2O3 suffices in order to achieve a reaction of Bi2O3 of thermopower Θ sensitive to a change of oxygen pressure. The β‐phase of the solid solution of Nb2O5 in Bi2O3, which is stable below 900 K, is a promising material for oxygen sensors which operate without the necessity of an oxygen reference pressure at relatively low temperatures. The reason for the rapid and reversible change of thermopower as a function of oxygen partial pressure is still unknown.