| http://www.w3.org/ns/prov#value | - Among them, preferred is a magnesium atom, a titanium atom, a zirconium atom, an iron atom, a cobalt atom, a nickel atom, a copper atom, a zinc atom or a boron atom; more preferred is a magnesium atom, a titanium atom, a zirconium atom, a zinc atom or a boron atom; and particularly preferred is a magnesium atom, a zirconium atom or a boron atom.
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