Thermoelectric material used for manufacture of thermoelectric device e.g. thermoelectric power gene

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A thermoelectric material (1604, 1606) comprises a filled skutterudite crystal structure (1). A thermoelectric material comprises a filled skutterudite crystal structure of formula : G yM 4X 1 2 (1). G : rare earth element (i), rare earth element (ii) and alkaline earth element; M : cobalt, rhodium or iridium; X : antimony, phosphorus or arsenic; and y : crystal structure filling fraction of 0.001-0.5.