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- W2399002055 abstract "The half-Heusler alloy HfNiGe has been synthesized by arc melting from high purity elements followed by annealing at 1000 K for 6 days to homogenize completely. The X-ray diffraction pattern indicates the presence of mainly an orthorhombic phase with small amount of other binary phases. The electrical resistivity is found to be low and increases slightly with temperature from 14 µΩ-m to 24 µΩ-m, indicating a semi metallic behavior. As a result the Seebeck coefficient is found to be low and also increases with temperature from −11 µV K−1 to −19.5 µV K−1. The thermal conductivity has been determined using a combination of heat capacity and thermal diffusivity. It decreases from ~ 1.9 Wm−1K−1 at room temperature to ~ 0.007 Wm−1K−1 at 843 K, an extremely low value for a half-Heusler alloy. The thermal conductivity reduction is found to be mainly due to a sharp decrease in heat capacity for T> 650 K. This leads to a divergence of figure of merit at high temperatures, >800K, from ~0.05 to 2 at 843 K." @default.
- W2399002055 created "2016-06-24" @default.
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- W2399002055 date "2016-01-01" @default.
- W2399002055 modified "2023-10-12" @default.
- W2399002055 title "Thermoelectric properties of ultra-low thermal conductivity half-Heusler alloy" @default.
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- W2399002055 doi "https://doi.org/10.1063/1.4948048" @default.
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