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

Sivaiah Bathula | Zendy; Bhasker Gahtori | Zendy; M. Jayasimhadri | Zendy; S. K. Tripathy | Zendy; Kriti Tyagi | Zendy; Avanish Kumar Srivastava | Zendy; Ajay Dhar | Zendy

Open Access

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

Author(s) -

Sivaiah Bathula,

Bhasker Gahtori,

M. Jayasimhadri,

S. K. Tripathy,

Kriti Tyagi,

Avanish Kumar Srivastava,

Ajay Dhar

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4892879

Subject(s) - spark plasma sintering , materials science , microstructure , thermoelectric effect , fracture toughness , metallurgy , sintering , thermoelectric materials , silicon , thermal shock , toughness , composite material , thermal conductivity , physics , thermodynamics

Owing to their high thermoelectric (TE) figure-of-merit, nanostructured Si80Ge20 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 Si80Ge20 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.

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