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| - As such materials, mention may be made, for example, of inorganic oxides such as SiO2 and the like, transition metal oxides such as titanium oxide, vanadium oxide, niobium oxide, molybdenum oxide, tantalum oxide, tungsten oxide, chromium oxide, zirconium oxide, hafnium oxide, lanthanum oxide, yttrium oxde and manganese oxide, metal oxides such as aluminum oxide, calcium oxide, strontium oxide, bar
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