| http://www.w3.org/ns/prov#value | - Suitable examples of metal oxides are calcium oxide, cerium oxide, magnesium oxide, titanium oxide, zinc oxide, silicon oxide, copper oxide, aluminum oxide (e.g., alumina and/or fumed alumina), silicon dioxide (e.g., silica and/or fumed silica), or the like, or a combination comprising at least one of the foregoing metal oxides.
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