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The thermal stability of high performance thermoelectric Zn4 Sb3 has been investigated using multi-temperature, high resolution synchrotron powder diffraction. Rietveld refinement of the data show ~30 % impurity phases at 500 K, which is inconsistent with previous reports of stability up to 523 K. At 700 K almost 70% of the sample has degraded. The influence of anion doping of Zn4Sb 3 on the thermal...
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