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Power factor S2σ versus absolute Seebeck coefficient. Open and closed symbols are parallel (Pa) and perpendicular (Pe) directions for the pressure direction of the Bi2Te2.85Se0.15Ix (x = 0.0, 0.1, 0.3, 0.5 mol.%) compounds. Full and dashed lines are theoretically calculated power factor S2σ along the Pe and Pa directions, respectively, with respect to the estimated electronic quality factor BE, as indicated in the legend.
