| http://www.w3.org/ns/prov#value | - Alkali metal oxides M2O and M???2O, where M and M??? represent mutually different kinds of alkali metals, or compounds decomposable to M2O and M???2O, respectively, by heating are mixed with titanium dioxide or a compound capable of forming titanium dioxide by heating in a molar ratio of M/M???/Ti of 3/1/5-3/1/11 and then the mixture is heated at a temperature of 500??-1,100?? C., preferably 600??
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