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- W4328102546 endingPage "142531" @default.
- W4328102546 startingPage "142531" @default.
- W4328102546 abstract "By adjusting the composition of half-Heusler (HH) alloys to deviate from the stoichiometric ratio, the generation of numerous full-Heusler (FH) nano-sized precipitates in the matrix is an effective method to improve its thermoelectric performance. However, it is difficult to control the size and shape of FH nanoprecipitates in the HH matrix and thus, to limit the substantial improvement in the thermoelectric properties. In this study, we discovered that some regular hexagonal nanoparticles with grain sizes of 10–50 nm were generated from the ZrNiSn matrix when Zr was in excess. The generation of coherent interfaces between the ZrNiSn matrix and Zr-rich nanoprecipitates can effectively scatter medium-frequency phonons and filter low-energy carriers, leading to a drastically reduced lattice thermal conductivity, improved carrier mobility, and retained Seebeck coefficient. Significantly, the extra Zr-rich nanoprecipitates with superstructures can generate dislocations to scatter medium-frequency phonons to further reduce the lattice thermal conductivity. Furthermore, the Zr-rich precipitates can inject a large number of carriers into the matrix, thereby improving the electrical conductivity. As a result, the interdependence between the electrical and thermal parameters was successfully decoupled by the generation of Zr-rich precipitates, thus leading to a notable enhancement of the thermoelectric performance of ZrNiSn-based alloys." @default.
- W4328102546 created "2023-03-22" @default.
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- W4328102546 date "2023-05-01" @default.
- W4328102546 modified "2023-10-18" @default.
- W4328102546 title "Enhancement in the thermoelectric performance of ZrNiSn-based alloys through extra Zr-rich nanoprecipitates with superstructures" @default.
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- W4328102546 doi "https://doi.org/10.1016/j.cej.2023.142531" @default.
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