Thermoelectric Transport Properties of n-Type Sb-doped (Hf,Zr,Ti)NiSn Half-Heusler Alloys Prepared by Temperature-Regulated Melt Spinning and Spark Plasma Sintering
| Autor: | Hyung Mo Jeong, Kyu Hyoung Lee, Jeong Yun Hwang, Sun-Uk Kim, Ki Wook Bae, Jae-Hong Lim, Hyun-Sik Kim, Sang-Il Kim |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Annealing (metallurgy) Analytical chemistry Spark plasma sintering 02 engineering and technology sub-micron grain 010402 general chemistry thermoelectric 01 natural sciences lcsh:Technology lcsh:Chemistry Thermal conductivity Thermoelectric effect half-Heusler General Materials Science thermal conductivity Instrumentation lcsh:QH301-705.5 Fluid Flow and Transfer Processes lcsh:T Process Chemistry and Technology General Engineering 021001 nanoscience & nanotechnology Grain size lcsh:QC1-999 0104 chemical sciences Computer Science Applications TiNiSn lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Grain boundary Crystallite Melt spinning 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences Volume 10 Issue 14 Applied Sciences, Vol 10, Iss 4963, p 4963 (2020) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app10144963 |
| Popis: | Herein we report a significantly reduced lattice thermal conductivity of Sb-doped Hf0.35Zr0.35Ti0.3NiSn half-Heusler alloys with sub-micron grains (grain size of ~300 nm). Polycrystalline bulks of Hf0.35Zr0.35Ti0.3NiSn1&minus xSbx (x = 0.01, 0.02, 0.03) with a complete single half-Heusler phase are prepared using temperature-regulated melt spinning and subsequent spark plasma sintering without a long annealing process. In these submicron-grained bulks, a very low lattice thermal conductivity value of ~2.4 W m&minus 1 K&minus 1 is obtained at 300 K due to the intensified phonon scatterings by highly dense grain boundaries and point-defects (Zr and Ti substituted at Hf-sites). A maximum thermoelectric figure of merit, zT, of 0.5 at 800 K is obtained in Hf0.35Zr0.35Ti0.3NiSn0.99Sb0.01. |
| Databáze: | OpenAIRE |
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