[ 22 ] observed a decreasing trend in the Seebeck coefficient with increasing temperature and Cu deficiency for all samples of Cu 3−δ SbSe 4 (0 ≤ δ ≤ 0.04) in the range of 300–675 K, with Cu 2.99 SbSe 4 exhibiting a maximum value of 263 μVK −1 at 475 K.
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Thermoelectric Performance of Non-Stoichiometric Permingeatite Cu<sub>3+m</sub>SbSe<sub>4</sub>.
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