| http://www.w3.org/ns/prov#value | - A chalcogenide having the following general formula (I): X.sub.(1-a)x X'ax Yy Zz (I) wherein x stands for at least one element selected from Bi, Sb and As, X' stands for at least one element selected from Pb, Sn and Ge, Y stands for at least one element selected from Ti, V, Nb and Ta, Z stands for at least one element selected from S, Se and Te, a is a number of 0.1, x is a num
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