| http://www.w3.org/ns/prov#value | - solution, the Sr solution, and the Mg solution are divided into two groups including a group which is impregnated into the alumina layer first, and a group which is impregnated later, it is preferable to impregnate the K solution later. [0061] In other words, in a case where the Ba solution, the K solution, the Sr solution, and the Mg solution are impregnated into the alumina layer simultaneously
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