PROCESS FOR PRODUCING MAYENITE-CONTAINING OXIDE, AND PROCESS FOR PRODUCING ELECTRICALLY CONDUCTIVE MAYENITE-CONTAINING OXIDE

摘要

Disclosed is a process for producing a mayenite-containing oxide that contains a mayenite-type compound and has a hydride ion density of 1 × 1018/cm3 or more, without requiring any expensive facility, control of complicated reaction conditions and a long reaction time.  Also disclosed is a process for producing an electrically conductive mayenite-containing oxide. Specifically disclosed is a process for producing a mayenite-containing oxide, which comprises the following steps: a raw material mixing step of producing a mixture comprising CaO and Al2O3 at a molar ratio of 9:10 to 14:5 in terms of oxide contents; and a hydrogenating step of calcining the mixture in a hydrogen-containing gas having a partial pressure of oxygen of 1000 Pa or less at a temperature of not lower than 1210°C and lower than 1350°C to thereby produce a mayenite-containing oxide that contains a mayenite-type compound and has a hydride ion density of 1 × 1018/cm3 or more.  Also specifically disclosed is a process for producing an electrically conductive mayenite-containing oxide that contains an electrically conductive mayenite compound, which comprises irradiating the mayenite-containing oxide with an ultraviolet ray or the like.