| http://www.w3.org/ns/prov#value | - The compound of the transition metal and the group VIA element is exemplified by a metal oxide such as a nickel oxide, a cobalt oxide, a titanium oxide, an iron oxide, a vanadium oxide, a manganese oxide, a molybdenum oxide, a chrome oxide or a tungsten oxide, a metal sulfide such as a molybdenum sulfide, an iron sulfide or a titanium sulfide, a hydride such as an oxy iron hydride or their mixture
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