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A series of Ba0.4In0.4Co4Sb12/Bi2Te2.7Se0.3 (FS/BT) thermoelectric (TE) materials were fabricated by a two-step spark plasma sintering method. The samples contained various numbers of gradient layers between FS and BT as follows: one gradient layer (1GL) with FS/BT volume ratio of 5:5, three GLs with ratios of 3:7, 5:5, and 7:3 (denoted as 3GLs-I with 3:7–5:5–7:3), 3GLs-II with 7:3–5:5–3:7, 5GLs-I...
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