| http://www.w3.org/ns/prov#value | - A second method of manufacturing a clathrate compound according to the present invention is a method wherein a compound of a group 4B element from the periodic table which incorporates at least one element to become the doping atoms and the substitution atoms is melted in an inert atmosphere, and following solidification, is cooled gradually, maintained at a temperature of at least 500??? C. for a
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