Conductive property of Zr_0.1Fe_0.9V_1.1Mo_0.9O₇ with low thermal expansion

Low thermal expansion materials are mostly ceramics with low conductive property, which limits their applications in electronic devices. The poor conductive property of ceramic ZrV₂O₇ could be improved by bi-substitution of Fe and Mo for Zr and V, accompanied with low thermal expansion. Zr_0.1Fe_0.9V_1.1Mo_0.9O₇ has electrical conductivity of 8.2×10^-5 S/cm and 9.41×10^-4 S/cm at 291 K and 623 K, respectively. From 291 K to 413 K, thermal excitation leads to the increase of carrier concentration, which causes the rapid decrease of resistance. At 413-533 K, the conductivity is unchanged due to high scattering probability and a slowing increase of carrier concentration. The conductivity rapidly increases again from 533 K to 623 K due to the intrinsic thermal excitation. The thermal expansion coefficient of Zr_0.1Fe_0.9V_1.1Mo_0.9O₇ is as low as 0.72×10^-6 K^-1 at 140-700 K from the dilatometer measurement. These properties suggest that Zr_0.1Fe_0.9V_1.1Mo_0.9O₇ has attractive application in electronic components.