Journal
MATERIALS RESEARCH BULLETIN
Volume 118, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2019.05.008
Keywords
Thermoelectric materials; Silicon-Germanium alloy; Mechanical milling; Spark plasma sintering; Mechanical properties
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Funding
- Indian Space Research Organization (ISRO), Department of Space, Govemment of India under RESPOND scheme [ISRO/RES/3/652/2013-2014]
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Silicon-germanium (SiGe) alloy is a potential and an attractive high temperature (> 1000 degrees C) thermoelectric material used in space applications as radioisotope thermoelectric generators (RTGs). However, the lower figure of merit (ZT) is the main setback in the SiGe alloy, and a lot of research strategies are demonstrated to improve the performance. The current investigation details the fabrication of high dense (> 99%) SiGe alloy doped with phosphorus (P) (0.5-2.0 at.%) by mechanical alloying (10 h) followed by spark plasma sintering (SPS). The synthesised SiGe-P-2.0 at.% alloy demonstrates the enhanced ZT 1.03 at 750 degrees C. Concurrently, the superior hardness of 9.8 +/- 0.17 GPa and fracture toughness (K-IC) of 2.3 +/- 0.15 MPa root m are achieved in SiGe-P-1.5 at.% and SiGe-P-2.0 at. % alloys, respectively.
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