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Alloying Cr2/3Te in AgCrSe2 compound for improving thermoelectrics
- Source :
- Applied Physics Letters. 118:193902
- Publication Year :
- 2021
- Publisher :
- AIP Publishing, 2021.
-
Abstract
- AgCrSe2, which crystallizes in alternative layers of Ag+ and CrSe2− octahedral structure, has shown great potential as good thermoelectric material due to its unique ultralow lattice thermal conductivity. In this work, compound Cr2/3Te is alloyed with the matrix Ag0.97CrSe2 and the carrier concentration ranges within 1018–1020 cm−3, enabling a reliable assessment of transport properties based on single parabolic band model at room temperature. Moreover, homogeneous nanoprecipitate is observed in the matrix for high Cr2/3Te content samples, which leads to the scattering of main heat carrier of long-wavelength phonons, and thus a slight reduction of lattice thermal conductivity (∼0.3 W/m K) compared with intrinsic AgCrSe2. Combined with the optimized carrier concentration and the low lattice thermal conductivity, a figure of merit zT of 0.6 at 650 K is achieved, exceeding other reported AgCrSe2 systems, demonstrating the current Ag0.97CrSe2(Cr2/3Te)x materials as good potential thermoelectrics.
- Subjects :
- 010302 applied physics
Work (thermodynamics)
Materials science
Physics and Astronomy (miscellaneous)
Condensed matter physics
Scattering
Phonon
Heat carrier
02 engineering and technology
021001 nanoscience & nanotechnology
Thermoelectric materials
01 natural sciences
Matrix (chemical analysis)
Octahedron
0103 physical sciences
Figure of merit
0210 nano-technology
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 118
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........88f48218903456faef5145b87c908b09