Journal
ADVANCED ENERGY MATERIALS
Volume 1, Issue 4, Pages 643-647Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201100126
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Funding
- Solid State Solar-Thermal Energy Conversion Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001299/DE-FG02-09ER46577]
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An enhancement in the dimensionless thermoelectric figure-of-merit (ZT) of an n-type half-Heusler material is reported using a nanocomposite approach. A peak ZT value of 1.0 was achieved at 600 degrees C-700 degrees C, which is about 25% higher than the previously reported highest value. The samples were made by ball-milling ingots of composition Hf0.75Zr0.25NiSn0.99Sb0.01 into nanopowders and hot-pressing the powders into dense bulk samples. The ingots were formed by arc-melting the elements. The ZT enhancement mainly comes from reduction of thermal conductivity due to increased phonon scattering at grain boundaries and crystal defects, and optimization of antimony doping.
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