Proton irradiation effect on thermoelectric properties of nanostructured n-type half-Heusler Hf0.25Zr0.75NiSn0.99Sb0.01
- Univ. of Notre Dame, IN (United States)
- Boise State Univ., ID (United States)
- Texas A & M Univ., College Station, TX (United States)
- Univ. of Utah, Salt Lake City, UT (United States)
- Univ. of Houston, TX (United States)
Here, thermoelectric properties of nanostructured half-Heusler Hf0.25Zr0.75NiSn0.99Sb0.01 were characterized before and after 2.5 MeV proton irradiation. A unique high-sensitivity scanning thermal microprobe was used to simultaneously map the irradiation effect on thermal conductivity and Seebeck coefficient with spatial resolution less than 2 μm. The thermal conductivity profile along the depth from the irradiated surface reflects excellent agreement with the irradiation-induced damage profile from simulation. The Seebeck coefficient was unaffected while both electrical and thermal conductivities decreased by 24%, resulting in no change in thermoelectric figure of merit ZT. Reductions in thermal and electrical conductivities are attributed to irradiation-induced defects that act as scattering sources for phonons and charge carriers.
- Research Organization:
- Boise State Univ., ID (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- Grant/Contract Number:
- NE0008255; NE0000124
- OSTI ID:
- 1540182
- Alternate ID(s):
- OSTI ID: 1454357
- Journal Information:
- Applied Physics Letters, Vol. 112, Issue 24; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
A Review on Principles and Applications of Scanning Thermal Microscopy (SThM)
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journal | September 2019 |
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