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• W1983302667 endingPage "033708" @default.
• W1983302667 startingPage "033708" @default.
• W1983302667 abstract "Ti substitution is a common strategy to further reduce the lattice thermal conductivity of (Zr,Hf)NiSn half-Heusler thermoelectric alloys, but phase separations are also observed in the resulting substituted samples. The n-type (Tix(Zr0.5Hf0.5)1−x)0.99Ta0.01NiSn alloys (x = 0.34, 0.4, 0.5, and 0.6), which are produced by arc-melting followed by annealing, show a phase separation into a Ti-poor primary dendritic half-Heusler phase and a Ti-rich interdendritic half-Heusler phase. For example, the x = 0.4 alloy consists of two phases: (Ti0.36Zr0.32Hf0.32)0.99Ta0.01NiSn and (Ti0.44Zr0.28Hf0.28)0.99Ta0.01NiSn. Using a detailed study of the phonon-scattering parameters of the single phase (Ti, Zr, Hf)NiSn compound as a function of mass and strain field fluctuations, a quantitative model of the lattice thermal conductivity has been successfully established. Based on this, the effective lattice thermal conductivity of the phase-separated samples can be well explained by the classical theory of composited medium. The theoretical calculation and the measured results indicate that both phases in the x = 0.4 sample possess the lowest lattice thermal conductivity. As a result, the dimensionless figure of merit ZT of this alloy is greater than that of the other compositions in the whole temperature range measured. A peak ZT of 1.0 at 750–800 K is obtained for this sample." @default.
• W1983302667 created "2016-06-24" @default.
• W1983302667 creator A5049341927 @default.
• W1983302667 creator A5064145558 @default.
• W1983302667 date "2014-07-21" @default.
• W1983302667 modified "2023-10-18" @default.
• W1983302667 title "Effects of phase separation on the thermoelectric properties of (Ti, Zr, Hf)NiSn half-Heusler alloys" @default.
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• W1983302667 doi "https://doi.org/10.1063/1.4890610" @default.
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