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Abstract
A series of SiO2/β-Zn4Sb3 core-shell composite particles with 3, 6, 9, and 12 nm of SiO2 shell in thickness were prepared by coating β-Zn4Sb3 microparticles with SiO2 nanoparticles formed by hydrolyzing the tetraethoxysilane in alcohol-alkali-water solution. SiO2/β-Zn4Sb3 nanocomposite thermoelectric materials were fabricated with these core-shell composite particles by spark plasma sintering (SPS) method. Microstructure, phase composition, and thermoelectric properties of SiO2/β-Zn4Sb3 nanocomposite thermoelectric materials were systemically investigated. The results show that β-Zn4Sb3 microparticles are uniformly coated by SiO2 nanoparticles, and no any phase transformation reaction takes place during SPS process. The electrical and thermal conductivity gradually decreases, and the Seebeck coefficient increases compared to that of β-Zn4Sb3 bulk material, but the increment of Seebeck coefficient in high temperature range remarkably increases. The thermal conductivity of SiO2/β-Zn4Sb3 nanocomposite material with 12 nm of SiO2 shell is the lowest and only 0.56 W·m−1·K−1 at 460 K. As a result, the ZT value of the SiO2/β-Zn4Sb3 nanocomposite material reaches 0.87 at 700 K and increases by 30%.
Keywords
nanocomposite material
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β-Zn4Sb3
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nanoengineering of particle surface
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thermoelectric properties
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Xuefeng Ruan, Wenkai Xiao.
Preparation and thermoelectric properties of SiO2/β-Zn4Sb3 nanocomposite materials.
Journal of Wuhan University of Technology Materials Science Edition, 2009, 24(5): 694-697 DOI:10.1007/s11595-009-5694-0
| [1] |
Mayer H. W., Mikhail I., Schubert K. Phases of ZnSbN and CdSbN Mixtures[J]. J Less Common Metals, 1978, 59: 43
|
| [2] |
Tapiero M., Tarabichi S., Gies J. G., . Preparation and Characterization of Zn4Sb3[J]. Solar Energy Mater, 1985, 12: 257
|
| [3] |
Caillat T., Fleurial J. P., Borahchevsky A. Preparation and Thermoelectric Properties of Semiconducting Zn4Sb3[J]. J Phy Chem Solids, 1997, 58(7): 1119
|
| [4] |
Tsutsui M., Zhang L. T., Ito K., . Effect of In-doping on the Thermoelectric Properties of β -Zn4Sb3[J]. Yamaguchi. Intermetallics, 2004, 12: 809
|
| [5] |
Nakamoto G., Souma T., Yamaba M., . Thermoelectric Properties of (Zn1−xCdx)4Sb3 below Room Temperature[J]. J. Alloys Compd., 2004, 377: 59
|
| [6] |
Iversen B B, Lundtoft B, Christensen B, et al. Improved P-type Thermoelectric Materials, a Process for their Manufacture and Uses Thereof[P]. Int Patent: 128467 A2, 2006
|
| [7] |
Pedersen B L, Birkedal H, Frederiksen P T, et al. High Temperature Stability of Thermoelectric Zn4Sb3[J]. Internationnal Conference on Thermoelectrics, 2006: 520
|
| [8] |
Kim S. G., Mazin I.I., Singh D. J. First-principles Study of Zn-Sb Thermoelectrics[J]. Phys Rev B, 1998, 57: 6199
|
| [9] |
Harman T. C., Taylor P. J., Walsh M. P., . Quantum Dot Superlattice Thermoelectric Materials and Devices[J]. Science, 2002, 297: 2229
|
| [10] |
Hicks L. D., Dresselhaus M. S. Effect of Quantum-well Structures on the Thermoelectric Figure of Merit[J]. Phys Rev B, 1993, 47: 12727
|
| [11] |
Heremans J. P., Thrush C. M., Morelli D. T. Thermopower Enhancement in Lead Telluride Nanostructures[J]. Phys Rev B, 2004, 70: 115334
|
| [12] |
Hicks L. D., Harman T. C., Sun X., . Experimental Study of the Effect of Quantum-well Structures on the Thermoelectric Figure of Merit[J]. Phys Rev B, 1996, 53: 10493
|
| [13] |
Venkatasubramanian R., Siivola E., Colpitts T., . Thin-film Thermoelectric Devices with High Room-temperature Figures of Merit[J]. Nature, 2001, 413: 597
|
| [14] |
Hsu K. F., Loo S., Guo F., . Cubic AgPbmSbTe2+m: Bulk Thermoelectric Materials with High Figure of Merit[J]. Science, 2004, 303: 818
|
| [15] |
Heremans J. P., Thrush C. M., Morelli D. T., . Thermoelectric Power of Bismuth Nanocomposites[J]. Phys Rev Lett, 2002, 88: 216801
|
| [16] |
Zhao X. Y., Shi X., Chen L. D., . Synthesis of YbyCo4Sb12/Yb2O3 Composites and Their Thermoelectric Properties[J]. Appl Phys Lett, 2006, 89: 092121
|
| [17] |
Zhai P. C., Zhao W. Y., Li Y., . Nanostructures and Enhanced Thermoelectric Properties in Ce-filled Skutterudite Bulk Materials[J]. Appl Phys Lett, 2006, 89: 052111
|
| [18] |
Zhao W. Y., Wang Y. J., Wu X. Y., . Preparation and Electrical Transportation Properties of Cu/B-Zn4Sb3 Nanocomposite Thermoelectric Materials[J]. J. Funct. Mater., 2007, 38(Sup): 135
|
