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Ba 0.3 Co 4 Sb 12 samples containing hierarchically structured TiO 2 show a very good thermoelectric performance, with the highest ZT value reaching 1.2 when 0.5% P25 plus 0.5% TiO 2 aggregates are added to the Ba 0.3 Co 4 Sb 12 matrix.
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Zhou et al. (2014) studied this question.
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