| http://www.w3.org/ns/prov#value | - The zinc silicates to be used according to the invention can furthermore be doped with up to 80, preferably 50, in particular 20, mol percent of further metals selected from the group (A) consisting of beryllium, magnesium, calcium, strontium, barium, manganese, iron, cobalt, nickel, copper, cadmium and mercury and the group (B) consisting of titanium, zirconium, hafnium, germanium, tin and lead,
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