| http://www.w3.org/ns/prov#value | - The multi-element metal chalcogenide according to the present invention may be prepared by a method including the steps of mixing powdery elements and/or powdery metal chalcogenides (MZn where M is a metal, Z is S, Se or Te and n is a number of 1???n???2) in amounts providing a composition corresponding to that of the above general formula, charging the mixture in a closed vessel such as a quartz
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