Abstract
Recently magnesium silicide (Mg2Si) has received great interest from thermoelectric (TE) society because of its non-toxicity, environmental friendliness, comparatively high abundance, and low production material cost as compared to other TE systems. It also exhibited promising transport properties, including high electrical conductivity and low thermal conductivity, which improved the overall TE performance (ZT). In this work, Mg2Si powder was obtained through high energy ball milling under inert atmosphere, starting from commercial magnesium silicide pieces (99.99 %, Alfa Aesar). To maintain fine microstructure of the powder, spark plasma sintering (SPS) process has been used for consolidation. The Mg2Si powder was filled in a graphite die to perform SPS and the influence of process parameters as temperature, heating rate, holding time and applied pressure on the microstructure, and densification of compacts were studied in detail. The aim of this study is to optimize SPS consolidation parameters for Mg2Si powder to achieve high density of compacts while maintaining the nanostructure. X-Ray diffraction (XRD) was utilized to investigate the crystalline phase of compacted samples and scanning and transmission electron microscopy (SEM & TEM) coupled with Energy-Dispersive X-ray Analysis (EDX) was used to evaluate the detailed microstructural and chemical composition, respectively. All sintered samples showed compaction density up to 98 %. Temperature dependent TE characteristics of SPS compacted Mg2Si as thermal conductivity, electrical resistivity, and Seebeck coefficient were measured over the temperature range of RT 600 °C for samples processed at 750 °C, reaching a final ZT of 0.14 at 600 °C.
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Dresselhaus MS, Chen G, Tang MY, Yang R, Lee H, Wang D, Ren Z, Fleurial J-P, Gogna P (2007) Adv Mater 19:1043
Rowe DM (1995) CRC handbook of thermoelectrics. CRC Press LLC, Boca Raton
Snyder GJ, Toberer ES (2008) Nature Mater 7:105
Hicks LD, Harman TC, Sun X, Dresselhaus MS (1996) Phys Rev B 53:R10493
Toprak M, Muhammed M (2006) CRC Thermoelectrics Handbook. CRC Press LLC, Boca Raton
Harman T, Walsh M, Laforge B, Turner G (2005) J Electron Mater 34:L19
Harman TC, Taylor PJ, Walsh MP, LaForge BE (2002) Science 297:2229
Li S, He Z, Toprak M, Stiewe C, Mueller E, Muhammed M (2007) Phys Status Solidi RRL 6:259
He ZM, Stiewe C, Platzek D, Karpinski G, Muller E, Li SH, Toprak M, Muhammed M (2007) J Appl Phys 101:043707
Poudel B, Hao Q, Ma Y, Lan YC, Minnich A, Yu B, Yan X, Wang DZ, Muto A, Vashaee D, Chen XY, Liu JM, Dresselhaus MS, Chen G, Ren ZF (2008) Science 320:5876
Saleemi M, Toprak MS, Li S, Johnsson M, Muhammed M (2012) J Mater Chem 22:725
Scheele M, Oeschler N, Meier K, Kornowski A, Klinke C, Weller H (2009) Adv Funct Mater 19:3476
Nikitin EN, Bazanov VG, Tarasov VI (1961) Sov Phys Solid State 3:2648
Harman TC, Taylor PJ, Spears DL, Walsh MP (2000) J Electron Mater 29:L1
Thermoelectric Materials of the Future, http://www.marlow.com/ resources/futureconcepts/materials.html Accessed June 9 2010
Bose S, Acharya HN, Banerjee HD (1993) J Mater Sci 28:5461. doi:10.1007/BF00367816
Wang L, Qin XY (2003) Scripta Mater 49:243
Rowe DM (2006) Thermoelectrics handbook macro to nano. CRC Press LLC, Boca Raton
Zaitsev V, Ktitorov S, Fedorov M (2009) CRC handbook of thermoelectrics. CRC Press LLC, Boca Raton
Schilz J, Riffel M, Pixius K, Meyer HJ (1999) Powder Technol 105:149
Wei X, Ying QX, Guang KM, Li C (2006) Trans Nonferrous Met Soc 16:987
Ioannou M, Hatzikraniotis E, Lioutas C, Hassapis T, Altantzis T (2012) Powder Technol 217:523
Lutterotti L, Matthies S, Wenk H-R, Schultz AS, Richardson JW (1997) J Appl Phys 81:594
Nanko M, Abe H, Takeda M, Homma T, Abe H, Kondo A, Naito M (2011) Mater Sci Eng 21:012006. doi:10.1088/1757-899X/21/1/012006
Fiameni S, Boldrini S, Battiston S, Famengo A (2012) J Solid State Chem 193:142
Jung JY, Kim IH (2010) Elec Mater Lett 6(4):187
Akasaka M, Iida T, Nemoto T, Soga J, Sato J, Makino K, Fukano M, Takanashi Y (2007) J Crys Growth 304:196
Martin JJ (1972) J Phys Chem Solids 33:1139
Bux SK, Yeung MT, Toberer ES, Snyder GJ, Kanerb RB, Fleuriala JP (2011) J Mater Chem 21:12259
Paul B, Banerji P (2009) Nanosci Nanotechnol Lett 1:208
Cederkrantz D, Farahi N, Borup KA, Iversen BB, Nygren M (2012) J Appl Phys 111:023701
Acknowledgements
This work has been funded by Swedish Foundation for Strategic Research–SSF (grant no: EM11-0002) and the Italian National Research Council–Italian Ministry of Economic Development Agreement “Ricerca di sistema elettrico nazionale.” The authors would like to thanks to Hans Bergqvist for TEM measurements.
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Saleemi, M., Toprak, M.S., Fiameni, S. et al. Spark plasma sintering and thermoelectric evaluation of nanocrystalline magnesium silicide (Mg2Si). J Mater Sci 48, 1940–1946 (2013). https://doi.org/10.1007/s10853-012-6959-0
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DOI: https://doi.org/10.1007/s10853-012-6959-0