Publication Date:
2016-01-01
Description:
We prepared a bulk sample of β - In 2 S 3 , which was predicted to possess high thermoelectric performance by ab initio calculations, using pulsed current sintering technique and conventional solid reaction method. The composition of prepared sample was In 2 S 2.94 , and the deficient in sulfur led to n -type behaviors of thermoelectric properties. The absolute value of Seebeck coefficient was | S | = 220 μ V/K at room temperature, and monotonically increased with temperature up to 600 K then moderately decreased. The thermal conductivity was relatively low (0.68 W m −1 K −1 ) at 700 K presumably due to the phonon scattering with anharmonic lattice vibrations. The dimensionless figure of merit ZT consequently reached 0.38 at 700 K. We also estimated the value of ZT as a function of carrier concentration, and found that p -type β - In 2 S 3 has potential to possess a large value of ZT exceeding 1.4.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics
