| 摘要 |
There is provided a C12A7 compound capable of selectively and reversibly clathrating X<-> ions, such as active oxygen radicals, with improved controllability. The C12A7 compound clathrating OH<-> ions and On<-> at a concentration of 2 x 10<19> cm<-3> or less can be prepared by subjecting a mixed material containing Ca and Al to a solid phase reaction at a firing temperature not lower than 1200 DEG C and lower than 1449 DEG C in a dry oxygen atmosphere having an oxygen partial pressure of 0.1 atm or more and a water vapor partial pressure of 10<-3> atm or less, keeping the resultant product at a temperature of 1200 DEG C or higher, and cooling rapidly. The C12A7 compound is heat-treated to clathrate OH<-> ions at a concentration of 2 x 10<19> cm<-3> or less, and On<-> at a high concentration of more than 2 x 10<19> cm<-3>. The compound can reversibly clathrate or release On<-> ion radicals through the elevation or lowering of the temperature thereof in a temperature range of 300 to 850 DEG C. The compound is useful for an oxidation catalyst, an anti-bacterial agent, an ion conducting material, an electrode for a solid-electrolyte fuel cell, and the like. <IMAGE> |
