We present a study of electrical properties and catalytic activities of materials belonging to the hydrated carbonated system . The polycrystalline hydroxycarbonate, dioxycarbonate, and oxide are prepared via a coprecipitation route followed by heat treatment. The electrical conduction of the phases obtained by thermal decomposition from , is analyzed by electrical impedance spectroscopy, from to , under air. The catalytic properties of , and polycrystalline phases are studied by FTIR spectroscopy, in presence of gas mixtures CO-air and -air, at temperatures ranging between to . The three materials behave differently in presence of CO or gases.