Thermal Properties of Si Mechanically Alloyed with FeSi₂ and CrSi₂

Abstract:

Thermal properties of Si mechanically alloyed with FeSi₂ and CrSi₂ were characterized for the samples with different volume fraction of the disilicides. An anomalously low thermal conductivity observed in the FeSi₂-doped samples was ascribed to an enhanced porosity of the samples which triggered the size effect on the lattice thermal conductivity reported previously for nanomeshed and “holey” silicon structures. It was also found that alloying of Si with FeSi₂ led to a reduction of thermal conductivity as compared to the reference sample of pure Si prepared under the same conditions. On the other hand, alloying of Si with CrSi₂ resulted in an increase in the thermal conductivity as compared to the reference sample of pure Si. The observed trends in the thermal conductivity were ascribed to the formation of impurity levels in the band gap.

• Periodical: Applied Mechanics and Materials (Volumes 799-800)
• Pages: 207-211
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.799-800.207
• Online since: October 2015
• Authors: Konstantin Nickolaevich Galkin*, Andrey A. Usenko, Andrey Voronin, Dmitriy Moskovskikh, Andrey Korotitskiy, Mikhail Gorshenkov, Nikolay G. Galkin, Vladimir Khovaylo
• Keywords: Mechanical Alloying, Nanocomposite, Silicides, Spark Plasma Sintering, Thermoelectric Materials

References

[1] Y. Lan, A.J. Miunich, G. Chen and R. Ren: Adv. Funct. Mater. Vol. 20 (2010), p.357.

[2] S.K. Bux, R.G. Blair, P.K. Gogna, H. Lee, G. Chen, M.S. Dresselhaus, R.B. Kaner and J. -P. Fleurial: Adv. Funct. Mater. Vol. 19 (2009), p.2445.

DOI: 10.1002/adfm.200900250

[3] Y. Lee, S. Lee and G.S. Hwang: Phys. Rev. B Vol. 83 (2011), p.125202.

[4] A. Paul and G. Klimeck: Appl. Phys. Lett. Vol. 98 (2011), p.083106.

[5] Y. He, D. Donadio and G. Galli: Appl. Phys. Lett. Vol. 98 (2011), p.144101.

[6] D.M. Rowe, V.S. Shukla and N. Savvides: Nature Vol. 290 (1981), p.765.

[7] H.Q. Liu, Y. Song, S.N. Zhang, X.B. Zhao and F.P. Wang: J. Phys. Chem. Solids Vol. 70 (2009), p.600.

[8] R. Yang and G. Chen: Phys. Rev. B Vol. 69 (2004), p.195316.

[9] M.S. Dresselhaus, G. Chen, M.Y. Tang, R. Yang, H. Lee, D. Wang, Z. Ren, J. -P. Fleurial and P. Gognaet: Adv. Mater. Vol. 19 (2007), p.1043.

[10] A.I. Hochbaum, R. Chen, R.D. Delgado, W. Liang, E.C. Garnett, M. Najarian, A. Majumdar and P. Yang: Nature Vol. 451 (2008), p.163.

DOI: 10.1038/nature06381

[11] A.A. Usenko, D.O. Moskovskikh, M.V. Gorshenkov, A.V. Korotitski, S.D. Kaloshkin, A.I. Voronin and V.V. Khovaylo: Scripta Mater. Vol. 96 (2015), p.9.

DOI: 10.1016/j.scriptamat.2014.10.001

[12] G. Joshi, H. Lee, Y. Lan, X. Wang, G. Zhu, D. Wang, R.W. Gould, D.C. Cuff, M.Y. Tang, M.S. Dresselhaus, G. Chen and Z. Ren: Nano Lett. Vol. 8 (2008), p.4670.

DOI: 10.1021/nl8026795

[13] X.W. Wang, H. Lee, Y.C. Lan, G.H. Zhu, G. Joshi, D.Z. Wang, J. Yang, A.J. Muto, M.Y. Tang, J. Klatsky, S. Song, M.S. Dresselhaus, G. Chen, and Z.F. Ren: Appl. Phys. Lett. Vol. 93 (2008), p.193121.

[14] R.B. Song, T. Aizawa and J.Q. Sun: Mater. Sci. Eng. B Vol. 136 (2007), p.111.

[15] J. -K. Yu, S. Mitrovic, D. Tham, J. Varghese and J.R. Heath: Nature Nanotech. Vol. 5 (2010), p.718.