Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3097026
Keywords
antimony alloys; bismuth alloys; grain boundaries; melt spinning; nanostructured materials; plasma materials processing; sintering; tellurium alloys; thermal conductivity; thermoelectricity
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Funding
- Natural Science Foundation of China [50731006, 50572082]
- DOE/EPSCoR Implementation Grant [DE-FG02-04ER-461390]
- SC EPSCoR
- China Scholarship Council (CSC) [2008695022]
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We report a melt spinning technique followed by a quick spark plasma sintering procedure to fabricate high-performance p-type Bi0.52Sb1.48Te3 bulk material with unique microstructures. The microstructures consist of nanocrystalline domains embedded in amorphous matrix and 5-15 nm nanocrystals with coherent grain boundary. The significantly reduced thermal conductivity leads to a state-of-the-art dimensionless figure of merit ZT similar to 1.56 at 300 K, more than 50% improvement of that of the commercial Bi2Te3 ingot materials.
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