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- W2337865551 abstract "It has been previously shown that Zintl compounds Ca1−xYbxZn2Sb2 and EuZn2Sb2 could be good candidates as thermoelectric materials. However, the conventional synthesis process via melting-solidification-annealing introduces impurities and vacancies, resulting in abnormal high carrier concentration and ultimately low thermoelectric properties. Here we report the enhanced thermoelectric performance of Ca1−xYbxZn2Sb2 (x=0, 0.25, 0.5, 0.75, and 1) prepared by ball milling and hot pressing. XRD confirms the samples are pure Zintl phase within its limit. Other compounds EuZn2Sb2, Eu0.5Yb0.5Zn2Sb2, and Eu0.5Ca0.5Zn2Sb2 are also prepared by ball milling and hot pressing to further understand them. The observed changes in effective mass appear to be one of the reasons for the big difference of carrier mobility in Ca and rare earth (Yb, Eu) alloyed compounds. The defects caused by alloying are the dominant phonon scattering source in these materials. The highest figure of merit of ~0.9 is achieved in Ca0.25Yb0.75Zn2Sb2, ~50% higher than the best reported ZT in similar materials prepared by melting-solidification-annealing method." @default.
- W2337865551 created "2016-06-24" @default.
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- W2337865551 date "2016-07-01" @default.
- W2337865551 modified "2023-10-16" @default.
- W2337865551 title "Enhancement of thermoelectric performance of phase pure Zintl compounds Ca1−Yb Zn2Sb2, Ca1−Eu Zn2Sb2, and Eu1−Yb Zn2Sb2 by mechanical alloying and hot pressing" @default.
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- W2337865551 doi "https://doi.org/10.1016/j.nanoen.2016.04.023" @default.
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