Effect of oxygen content on CO2 absorption characteristics of Li2TiO3

In order to investigate the CO2 absorption characteristics of the low- and high-density Li2TiO3 samples, X-ray diffraction (XRD), non-Rutherford backscattering spectroscopy (NRBS) and elastic recoil detection (ERD) analyses have been performed. Crystallographic structure of a sintered and CO2 exposed samples is decided by the XRD analysis, and the NRBS and ERD analyses have evaluated the amount of CO2 absorption and H content quantitatively. The CO2 absorption characteristics of the non-stoichiometric Li2TiO3 sample are investigated. It is found that the CO2 absorption rate of the non-stoichiometric Li2TiO3 sample is much larger than that of the stoichiometric sample. The Li2TiO3 sample (80%T.D.) has a good tritium release characteristics, and we find also that the sample sintered at temperatures higher than 1,428 K absorb very little CO2 under high humidity conditions. The amount of CO2 absorption of the low-density Li2TiO3 samples is found to increase with increase in the humidity. This seems to be a catalytic effect of water vapor on CO2 absorption at the Li2TiO3 surface.