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The present invention provides a thermoelectric material and a method of manufacturing it. The thermoelectric material contains a half-Heusler compound including a composition represented by : (Ti1−aAa)1+x(Ni1−bBb)1+y(Sn1−cCc) where 0≦a<0.1, 0≦b<0.1 and 0≦c<0.1; −0.1≦x≦0.2 and 0
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