[摘要]：Materials from the solid solution with general formula Ti1-2xCrxNbxO2 (0 20 S cm(-1) in 5% H-2/Ar. The lowest conductivity was observed for samples low in titanium content, indicating that the reduction of Ti4+ to Ti3+ is primarily responsible for the high electronic conductivity in these materials. All samples showed very slow reduction kinetics, and true equilibrium was not achieved even after > 50 h in flowing 5% H-2/Ar at 900 degrees C, suggesting that the equilibrium conductivity of these materials at 10(-20) atm may be significantly higher. Conductivity studies as a function of p(O-2) showed complex redox behavior with indications of a number of step transitions and very slow redox kinetics. The thermal expansion coefficient was in the range of 5.6 x 10(-6) - 8.6 x 10(-6) K-1, which changed little between reduced and fully oxidized samples.
