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Mo-Re-C compounds containing Mo 7 Re 13 C with the β-Mn structure were synthesized with high-melting-temperature metals Mo, Re, and C powders using a conventional solid state method with a planetary ball milling machine instead of the arc melting method. Use of the ball milling machine was necessary to obtain Mo 7 Re 13 C with the β-Mn structure using the solid state method. Almost single-phase Mo 7 Re 13 C with a trace of impurity were obtained using the synthesis method. By XRF and lattice parameter measurements on the samples, Fe element existed in the compound synthesized using the planetary ball milling machine with a pot and balls made of steel, though Fe element was not detected in the compound synthesized using a pot and balls made of tungsten carbide. The former compound containg the Fe atom did not show superconductivity but the latter compound without the Fe atom showed superconductivity at 6.1 K. [ABSTRACT FROM AUTHOR]

We compared reactivity between CO2 and Li2CuO2 with that between CO2 and Li4SiO4 by using XRD, SEM observation, and thermogravimetry in order to study fundamentally a potential of Li2CuO2 oxide for application to solid CO2 absorbents. The CO2 absorption ability of Li2CuO2 was examined by measuring rate constants for the gas–solid reaction between perfectly single-phase Li2CuO2 and CO2 at various temperatures in 100vol% CO2 atmosphere using the rate theory with thermogravimetry using rapid heating. The measured rate constants were compared with those reported previously for Li4SiO4 at various temperatures. Almost no difference was found between these rate constants of Li2CuO2 and Li4SiO4 at temperatures less than 660°C, but at temperatures higher than 670°C, the rate constants of Li2CuO2 were greater than those of Li4SiO4. These results demonstrate that Li2CuO2 can outstrip the ability of Li4SiO4 to absorb CO2. Moreover, different from Li4SiO4, the CO2 absorption ability of Li2CuO2 decays only slightly, even if the atmospheric CO2 concentration decreases. [ABSTRACT FROM AUTHOR]