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

被引：41
作者：
Bathula, Sivaiah [1 ,2 ]
Gahtori, Bhasker [1 ]
Jayasimhadri, M. [2 ]
Tripathy, S. K. [1 ]
Tyagi, Kriti [1 ]
Srivastava, A. K. [1 ]
Dhar, Ajay [1 ]
机构：
[1] CSIR Natl Phys Lab, CSIR Network Inst Solar Energy, New Delhi 110012, India
[2] Delhi Technol Univ, Dept Appl Phys, Delhi, India
来源：
APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 06期
关键词：
FRACTURE-TOUGHNESS; GRAIN-BOUNDARIES; YOUNGS MODULUS; HARDNESS; INDENTATION; PHASE; TRANSFORMATION; PERFORMANCE; SCATTERING; TRANSPORT;
D O I：
10.1063/1.4892879
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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. (C) 2014 AIP Publishing LLC.
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页数：5
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