Patent ID: 9570667
Date: 2017-02-14
CPC Classifications: B22F,C22C,H01L

Claim:
1. A thermoelectric conversion material made of a polycrystalline material which is represented by a composition formula (1) shown below and has a MgAgAs type crystal structure, the polycrystalline material comprising: MgAgAs type crystal grains having regions of different Ti concentrations, wherein 0.2≦a≦0.7, 0.3≦b≦0.8, a+b=1, 0.93≦c≦1.08, 0.93≦e≦1.08, and d=1; A is at least one element selected from the group consisting of Zr and Hf, D is at least one element selected from the group consisting of Ni, Co, and Fe, and X is at least one element selected from the group consisting of Sn and Sb.