Patent ID: 7745720

Claim:
A thermoelectric material comprising a composition represented by the following formula (A): (Ti a1 Zr b1 Hf c1 )Ni y Sn 100-x-y (A) wherein 0<a1<1, 0<b1<1, 0<c1<1, a1+b1+c1=1, 30≦x≦35, and 30≦y=35, wherein the composition has at least two MgAgAs crystal phases different in a lattice constant, and, assuming that X-ray diffraction peak intensity from (422) diffraction plane of a first MgAgAs crystal phase having a smallest lattice constant and X-ray diffraction peak intensity from a (422) diffraction plane of a second MgAgAs crystal phase having a largest lattice constant be I 1 and I 2 , respectively, a value of I 1 /(I 1 +I 2 ) being in a range of 0.2 to 0.8.