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Ba8Cu6Si16Ge24 clathrate alloys were synthesized by high temperature and high pressure (HPHT) method, and the effect of the different pressures on the structure and thermoelectric properties was investigated. The synthesis time was sharply reduced from a few days to 30 min. The lowest possible thermal conductivity 0.76 Wm−1 K−1 was obtained due to the lattice disorders and dislocations. A relatively...
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