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Journal of Electronic Materials

, Volume 48, Issue 1, pp 649–655 | Cite as

Optimization of Thermoelectric Properties of Mechanically Alloyed p-Type SiGe by Mathematical Modelling

  • Sajid AhmadEmail author
  • Ajay Singh
  • Ranita Basu
  • Satish Vitta
  • K. P. Muthe
  • S. C. Gadkari
  • S. K. Gupta
Article
  • 21 Downloads

Abstract

Silicon germanium (SiGe) is a conventional high temperature thermoelectric material, which is usually synthesized through a mechanical alloying route using a ball mill, followed by sintering using a vacuum hot press for fabrication of dense bulk samples. The milling time and sintering temperature are two important parameters that have a major influence on the thermoelectric properties of synthesized samples. In the present work, a simulation technique (i.e., response surface analysis) was employed to study the effect of milling time and sintering temperature on the thermoelectric properties of p-type SiGe. The statistical optimisation of thermoelectric properties was performed using the central composite rotatable design. The responses like electrical resistivity, thermal conductivity, Seebeck coefficient, power factor and the figure-of-merit (ZT) of p-type SiGe alloys were evaluated. The experimental data was fitted to a second order polynomial model and the fitted model was evaluated by regression analysis and analysis of variance (ANOVA). A surprising finding of the analysis is that all responses are optimized at similar values of hot press temperature and ball milling times. There was a model predicted optimum value of ZT = 1.148 at sintering temperature of 1504.5 K and ball milling time of 53.6 h.

Keywords

Thermoelectrics mathematical modelling mechanical alloying silicon germanium figure of merit 

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Notes

Acknowledgments

Authors (Satish Vitta and Ajay Singh) would like to acknowledge the BRNS (37(3)/14/03/2017-BRNS/ 37037) for the financial support.

Supplementary material

11664_2018_6766_MOESM1_ESM.pdf (882 kb)
Supplementary material 1 (PDF 883 kb)

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  1. 1.Nuclear Research Laboratory, Astrophysical Sciences DivisionBhabha Atomic Research CenterSrinagarIndia
  2. 2.Technical Physics DivisionBhabha Atomic Research CenterMumbaiIndia
  3. 3.Homi Bhabha National InstituteMumbaiIndia
  4. 4.Department of Metallurgical Engineering and Materials ScienceIIT MumbaiMumbaiIndia

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