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- W3136334959 abstract "The rapid rise of atmospheric CO2 has spurred keen research interest in sustainable energy technologies including thermoelectric materials which can reliably and robustly turn heat directly to electricity. Yb14MnSb11 has been the material of intense study because of its high thermoelectric figure of merit, zT. A structural analogue, Yb14MgSb11, is also of interest as it has a higher average zT (∫TcThZ(T)dT,ZT) and a comparable peak zT (1.3 vs 1.2) to Yb14MnSb11. We have shown that Yb14MgSb11 can be composited with micron-sized iron particles with significant improvements to the thermoelectric power factor (PF) and mechanical properties. In this work, we successfully employ a rapid high-temperature in situ reaction to create well-dispersed nanoscale (<100 nm) iron inclusions in the bulk Yb14MgSb11 matrix via the decomposition of FeSb2 into Fe and Sb. The incorporation of nanoscale iron into Yb14MgSb11 further reduces the lattice thermal conductivity (κl), when compared to the previously published micron iron composites, due to an increase in phonon scattering. As a result of the synchronous decrease in thermal conductivity and resistivity, the 7.3 vol % Fe sample retains the zT of Yb14MgSb11 while achieving a 43% PF improvement." @default.
- W3136334959 created "2021-03-29" @default.
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- W3136334959 date "2021-03-18" @default.
- W3136334959 modified "2023-10-15" @default.
- W3136334959 title "Chemical Route to Yb<sub>14</sub>MgSb<sub>11</sub> Composites with Nanosized Iron Inclusions for the Reduction of Thermal Conductivity" @default.
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- W3136334959 doi "https://doi.org/10.1021/acsaem.1c00163" @default.
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