Abstract
In this paper the influence of the starting material on the physical properties after severe plastic deformation (SPD) will be discussed. A bulk p-type skutterudite DD0.44Fe2.1Co1.9Sb12(DD stands for didymium which consists of 4.76% Pr and 95.24% Nd) was (1) hand milled and hot pressed, resulting in crystallite sizes in the μm range and (2) ball milled and hot-pressed, reducing the crystallite size to about 100nm, and afterwards deformed using high pressure torsion (HPT). It could be shown that in both cases the lattice parameters were slightly higher after HPT processing, the difference of the electrical resistivity values between heating and cooling was much larger for the skutterudite, which stems from the microstructured alloy. The thermopower data for both alloys are slightly higher, resulting in power factors at 800K almost like (originally nanosample) or even higher (originally microsample) than before HPT. As the thermal conductivity is always lower after SPD, a much higher ZT can be expected. After deformation hardness measurements showed a much higher increase for the nanosample compared to that of the microstructured one.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Rogl G, Grytsiv A, Bauer E, Rogl P, Zehetbauer M (2011) Intermetallics 19:546–555
Rogl G, Grytsiv A, Melnychenko-Koblyuk N, Bauer E, Laumann S, Rogl P (2011) J Phys Condens Matter 23:275601–2756012
Shi X, Yang J, Salvador R, Cji M, Cho JY, Wang H, Bai S, Yang J, Zhang W, Chen L (2011) J Am Chem Soc 133:7837–7846
Callaway J (1959) Phys Rev 113:1046
Callaway J, von Baeyer J (1960) Phys Rev 120:1149
Callaway J (1961) Phys Rev 122:787
Tritt TM (2004) Thermal conductivity. In: Theory, properties and applications. Kluwer Academic/Plenum, New York/Boston/Dirdrecht/London/Moscow
Hicks LD, Harman TC, Dresselhaus MS (1993) Appl Phys Lett 63:3230
Dresselhaus MS, Heremans JP (2003) Thermoelectrics handbook. Wiley, New York, p 1338
Ashida M, Hamachiyo T, Hasezaki K, Matsunoshita H, Kai M, Horita Z (2009) J Phys Chem Solids 70:1089–1092
Ashida M, Hamachiyo T, Hasezaki K, Matsunoshita H, Kai M, Horita Z (2008) Mater Sci Forum 584–586:1006–1011
Sun ZM, Hashimoto H, Keawprak N, Ma AB, Li LF, Barsoum NW (2005) J Mater Res 20(4):895–903
Im J-T, Hartwig KT, Sharp J (2004) Acta Mater 52:49–55
Zhang L, Grytsiv A, Bonarski B, Kerber M, Steman D, Schafler E, Rogl P, Bauer E, Hilscher G, Zehetbauer M (2010) J Alloys Compd 494:78–83
Rogl G, Setman D, Schafler E, Horky J, Kerber M, Zehetbauer M, Falmbigl M, Rogl P, Royanian E, Bauer E (Acta Materialia). accepteded
Zehetbauer M, Grössinger R, Krenn H, Krystian M, Pippan P, Rogl P, Waitz R, Würschum R (2011) Adv Eng Matter 12:692
Zhang L, Grytsiv A, Kerber M, Rogl P, Bauer E, Zehetbauer M, Wosik J, Nauer GE (2010) J Alloys Compd 481:106–115
Rogl G, Grytsiv A, Bauer E, Rogl P, Zehetbauer M (2010) Intermetallics 18:57–60
Rogl G, Zehetbauer M, Kerber M, Rogl P, Bauer E (2011) Mater Sci Forum 667–669:1089–1094
Acknowledgements
This work was supported by the Austrian Science Fund Project No. S10403.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer Science+Business Media Dordrecht
About this paper
Cite this paper
Rogl, G. et al. (2013). Changes of Thermoelectric Properties and Hardness After HPT Processing of Micro- and Nanostructured Skutterudites. In: Zlatic, V., Hewson, A. (eds) New Materials for Thermoelectric Applications: Theory and Experiment. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4984-9_7
Download citation
DOI: https://doi.org/10.1007/978-94-007-4984-9_7
Published:
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-007-4983-2
Online ISBN: 978-94-007-4984-9
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)