Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 197, Issue -, Pages 75-81Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2015.03.011
Keywords
Thermoelectric; Bismuth telluride; Ball milling; Spark plasma sintering; Antisite defects; Mechanical performance
Funding
- National Basic Research Program of China [2013CB632503]
- National Natural Science Foundation [51172121, 11474176]
- 863 Program [2012AA051104]
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Ball milling (BM) combined with spark plasma sintering (SPS) is increasingly used for fabricating high-performance thermoelectric materials. This work was conducted to clarify the effects of BM and SPS on the electrical transport and thermoelectric properties of both p- and n-type Bi2Te3 based materials using commercially available p-type (BLSb)(2)Te-3 and n-type Bi-2(Se,Te)(3) ingots. Interestingly, it is found that BM and SPS differently affected the electrical properties of p- and n-type Bi2Te3-based thermoelectric materials; the dimensionless thermoelectric figure of merit (ZT) increases in p-type Bi0.3Sb1.5Te3 but decreases somewhat in n-type Bi2Te2.7Se0.3 after BM and SPS. Hall experiments reveal the reason for this difference. Both p-type and n-type sintered materials show 2-3 times higher mechanical strength than the ingots because of microstructure refinement effect, which has been measured by using a small-sized biaxial bending test. The improved mechanical properties are in favor for device fabrication. (C) 2015 Elsevier B.V. All rights reserved.
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