| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermoelectric conversion material excellent in thermoelectric conversion performance.SOLUTION: A thermoelectric conversion material 10 contains a plurality of mother phase particles 22, and nanoparticles 30. The nanoparticle 22 contains a crystal structure. The nanoparticle 30 contains an oxide and exists on the interface of the mother phase particles 22. The nanoparticle 30 contains at least one element composing the crystal structure. When a range of 6×4 μm of the thermoelectric conversion material 10 is acquired as one sectional observation image, by using a scanning electron microscope, the average of circle area equivalent diameter, i.e., the average grain size d, of a particle group consisting of the mother phase particles 22 and nanoparticles 30, observed in the sectional observation image, is 100-1000 nm.SELECTED DRAWING: Figure 1 |
