Effect of simultaneous addition of Li2O and V2O5 on the humidity sensitivity of TiO2 ceramics

Porous TiO2 ceramics containing Li2O and V2O5 were prepared by a solid-state reaction method and their humidity sensitivity was investigated, The types and amounts of additives determine the sinterability of TiO2 ceramics; simultaneous addition of Li2O and V2O5 resulted in significantly higher mechanical strength than that achieved by the separate addition of each additive. The additives also changed the microstructure of the ceramics, and relatively uniform grains and voids were observed with the simultaneous addition. The impedance of various samples was measured during changes in atmospheric humidity, and the results indicated that simultaneous addition decreased impedance and improved humidity sensitivity. Furthermore, we found that samples with almost no hysteresis in humidity sensitivity could be obtained by changing the ratio of Li2O to V2O5.