| http://www.w3.org/ns/prov#value | - a maximum temperature of not less than 350 ??? C. to solidify the layer of the solution to form a first layer; (d) forming a layer of the other solution of said at least two kinds of solutions on the first layer, wherein the first layer is insoluble in the other solution; (e) subjecting the layer of the other solution to heat treatment at a maximum temperature of not less than 350
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