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Optimized thermoelectric properties of Mo(3)Sb(7-x)Te(x) with significant phonon scattering by electrons
| Content Provider | Semantic Scholar |
|---|---|
| Author | Shi, Xiaoya Pei, Yanzhong Snyder, Gerald Jeffrey Chen, Lidong |
| Copyright Year | 2011 |
| Abstract | Heavily doped compounds Mo3Sb7−xTex (x = 0, 1.0, 1.4, 1.8) were synthesized by solid state reaction and sintered by spark plasma sintering. Both X-ray diffraction and electron probe microanalysis indicated the maximum solubility of Te was around x = 1.8. The trends in the electrical transport properties can generally be understood using a single parabolic band model, which predicts that the extremely high carrier concentration of Mo3Sb7 (∼1022 cm−3) can be reduced to a nearly optimized level (∼2 × 1021 cm−3) for thermoelectric figure of merit (zT) by Te-substitution with x = 1.8. The increased lattice thermal conductivity by Te-doping was found to be due to the decreased Umklapp and electron–phonon scattering, according to a Debye model fitting. The thermoelectric figure of merit (zT) monotonously increased with increasing temperature and reached its highest value of about 0.51 at 850 K for the sample with x = 1.8, making these materials competitive with the state-of-the-art thermoelectric SiGe alloys. Evidence of significant electron–phonon scattering is found in the thermal conductivity. |
| Starting Page | 4086 |
| Ending Page | 4095 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C1EE01406D |
| Alternate Webpage(s) | http://authors.library.caltech.edu/27665/1/Shi2011p16175Energ_Environ_Sci.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C1EE01406D |
| Volume Number | 4 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
