Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5458189 | Journal of Alloys and Compounds | 2017 | 17 Pages |
Abstract
Cu2SnS3 (copper tin sulfide, CTS) is regarded as a promising eco-friendly TE material due to its phonon-glass-electron-crystal nature. In our work, ceramics of p-type pristine and Ni-doped Cu2SnS3 bulk materials were prepared by solid-state reaction and spark plasma sintering process. Ni-doping effectively optimized the electrical transport performance, with a very high PF about 0.9Â mWmâ1Kâ2 due to the unique electron-crystal advantages of CTS. Induced by Ni-substitution, the crystal structure of CTS transformed from original monoclinic to cubic symmetry with a softening of M-S bonds and a disordered metal atom arrangement which gave rise to a reduction of sound velocity and a strongly intensified phonon scattering. Low lattice thermal conductivity, ranging from 0.95 Wmâ1Kâ1 near 300Â K to 0.41 Wmâ1Kâ1Â at 723Â K, was achieved, with the latter approaching the theoretical minimum. As a result, a relatively high ZT up to 0.56 was obtained at 723Â K in the Cu2Sn0.9Ni0.1S3 sample.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Xiaoxuan Xu, Huiwen Zhao, Xiaohui Hu, Lin Pan, Changchun Chen, Dongxu Li, Yifeng Wang,