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Disclosed is a thermoelectric material which is represented by the following composition formula (1) or (2) and comprises as a major phase an MgAgAs type crystal structure : [in-line-formulae](Tia1Zrb1Hfc1)xNiySn100-x-y composition formula (1); [/in-line-formulae][in-line-formulae](Lnd(Tia2Zrb2Hfc2)1-d)xNiySn100-x-y composition formula (2); [/in-line-formulae] (wherein a1, b1, c1, x and y satisfy the conditions of : 0
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