skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Microstructure and mechanical properties of thermoelectric nanostructured n-type silicon-germanium alloys synthesized employing spark plasma sintering

Abstract

Owing to their high thermoelectric (TE) figure-of-merit, nanostructured Si{sub 80}Ge{sub 20} alloys are evolving as a potential replacement for their bulk counterparts in designing efficient radio-isotope TE generators. However, as the mechanical properties of these alloys are equally important in order to avoid in-service catastrophic failure of their TE modules, we report the strength, hardness, fracture toughness, and thermal shock resistance of nanostructured n-type Si{sub 80}Ge{sub 20} alloys synthesized employing spark plasma sintering of mechanically alloyed nanopowders of its constituent elements. These mechanical properties show a significant enhancement, which has been correlated with the microstructural features at nano-scale, delineated by transmission electron microscopy.

Authors:
 [1];  [2]; ; ; ; ;  [1];  [3]
  1. CSIR-Network of Institutes for Solar Energy, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012 (India)
  2. (India)
  3. Department of Applied Physics, Delhi Technological University, Delhi (India)
Publication Date:
OSTI Identifier:
22317990
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FRACTURE PROPERTIES; GERMANIUM ALLOYS; HARDNESS; MICROSTRUCTURE; NANOSTRUCTURES; N-TYPE CONDUCTORS; SILICON; SILICON ALLOYS; SINTERING; THERMAL SHOCK; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Bathula, Sivaiah, Department of Applied Physics, Delhi Technological University, Delhi, Gahtori, Bhasker, Tripathy, S. K., Tyagi, Kriti, Srivastava, A. K., Dhar, Ajay, E-mail: adhar@nplindia.org, and Jayasimhadri, M. Microstructure and mechanical properties of thermoelectric nanostructured n-type silicon-germanium alloys synthesized employing spark plasma sintering. United States: N. p., 2014. Web. doi:10.1063/1.4892879.
Bathula, Sivaiah, Department of Applied Physics, Delhi Technological University, Delhi, Gahtori, Bhasker, Tripathy, S. K., Tyagi, Kriti, Srivastava, A. K., Dhar, Ajay, E-mail: adhar@nplindia.org, & Jayasimhadri, M. Microstructure and mechanical properties of thermoelectric nanostructured n-type silicon-germanium alloys synthesized employing spark plasma sintering. United States. doi:10.1063/1.4892879.
Bathula, Sivaiah, Department of Applied Physics, Delhi Technological University, Delhi, Gahtori, Bhasker, Tripathy, S. K., Tyagi, Kriti, Srivastava, A. K., Dhar, Ajay, E-mail: adhar@nplindia.org, and Jayasimhadri, M. Mon . "Microstructure and mechanical properties of thermoelectric nanostructured n-type silicon-germanium alloys synthesized employing spark plasma sintering". United States. doi:10.1063/1.4892879.
@article{osti_22317990,
title = {Microstructure and mechanical properties of thermoelectric nanostructured n-type silicon-germanium alloys synthesized employing spark plasma sintering},
author = {Bathula, Sivaiah and Department of Applied Physics, Delhi Technological University, Delhi and Gahtori, Bhasker and Tripathy, S. K. and Tyagi, Kriti and Srivastava, A. K. and Dhar, Ajay, E-mail: adhar@nplindia.org and Jayasimhadri, M.},
abstractNote = {Owing to their high thermoelectric (TE) figure-of-merit, nanostructured Si{sub 80}Ge{sub 20} alloys are evolving as a potential replacement for their bulk counterparts in designing efficient radio-isotope TE generators. However, as the mechanical properties of these alloys are equally important in order to avoid in-service catastrophic failure of their TE modules, we report the strength, hardness, fracture toughness, and thermal shock resistance of nanostructured n-type Si{sub 80}Ge{sub 20} alloys synthesized employing spark plasma sintering of mechanically alloyed nanopowders of its constituent elements. These mechanical properties show a significant enhancement, which has been correlated with the microstructural features at nano-scale, delineated by transmission electron microscopy.},
doi = {10.1063/1.4892879},
journal = {Applied Physics Letters},
number = 6,
volume = 105,
place = {United States},
year = {Mon Aug 11 00:00:00 EDT 2014},
month = {Mon Aug 11 00:00:00 EDT 2014}
}