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A thermoelectric material includes a filled skutterudite crystal structure having the formula GyM4X12, where i) G includes at least two rare earth elements and an alkaline earth element, ii) M is cobalt, rhodium, or iridium, and iii) X is antimony, phosphorus, or arsenic. The subscript “y” refers to a crystal structure filling fraction ranging from about 0.001 to about 0.5.