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

Bathula, Sivaiah; Gahtori, Bhasker; Tripathy, S. K.; Tyagi, Kriti; Srivastava, A. K.; Dhar, Ajay; Jayasimhadri, M.

doi:10.1063/1.4892879

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

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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:

Bathula, Sivaiah ^[1]; Gahtori, Bhasker; Tripathy, S. K.; Tyagi, Kriti; Srivastava, A. K.; Dhar, Ajay ^[1]; Jayasimhadri, M. ^[2]

CSIR-Network of Institutes for Solar Energy, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012 (India)
Department of Applied Physics, Delhi Technological University, Delhi (India)

Publication Date:: Mon Aug 11 00:00:00 EDT 2014

OSTI Identifier:: 22317990

Resource Type:: Journal Article

Journal Name:: Applied Physics Letters

Additional Journal Information:: Journal Volume: 105; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951

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, 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.

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                    Bathula, Sivaiah, Department of Applied Physics, Delhi Technological University, Delhi, Gahtori, Bhasker, Tripathy, S. K., Tyagi, Kriti, Srivastava, A. K., Dhar, Ajay, & Jayasimhadri, M. Microstructure and mechanical properties of thermoelectric nanostructured n-type silicon-germanium alloys synthesized employing spark plasma sintering.  United States.  https://doi.org/10.1063/1.4892879

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                    Bathula, Sivaiah, Department of Applied Physics, Delhi Technological University, Delhi, Gahtori, Bhasker, Tripathy, S. K., Tyagi, Kriti, Srivastava, A. K., Dhar, Ajay, and Jayasimhadri, M. 2014.  
        "Microstructure and mechanical properties of thermoelectric nanostructured n-type silicon-germanium alloys synthesized employing spark plasma sintering".  United States.  https://doi.org/10.1063/1.4892879.

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@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 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},

  url          = {https://www.osti.gov/biblio/22317990},
  journal      = {Applied Physics Letters},

  issn         = {0003-6951},

  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}

}

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