Thermoelectric performance of quaternary Cu–Bi–Sb–Te alloys prepared by cold pressing

Microstructures and thermoelectric properties of p-type pseudo-binary Bi–Sb–Te alloys with partial substitution of Ga for Sb prepared by spark plasma sintering

“…6a, we can observe that κ generally increases with rising temperature for all the Ga doped samples (Fig. 6a), the variation trend is quite different from those of the Ag and Cu doped samples [6,7,13], the reason requires further investigation. Below 370 K, the κ values keep almost unchanged (0.95-1.01 W K −1 m −1 ), nearly temperature-independent thermal conductivity is usually indicative of disordered and amorphous materials [14], resulting mainly from severely disordered structures at low temperatures.…”

“…Based on the research from our group in recent years, results evidenced that a proper substitution of Ag and Cu atoms for Sb in the Bi 0.5 Sb 1.5 Te 3 alloy is essential in improving the thermoelectric materials [5][6][7]. Cu doping can reduce thermal conductivity and increase electron mobility [8].…”

Electrical and thermoelectric properties of PbSe doped with Sm

“…The general trend is the enhancement of the absolute value of Seebeck coefficient with Sm enriching [29] and the highest value is possessed for Pb 0.94 Sm 0.06 Se composition. The reduction of |S| which associates the annealing time prolongation may be attributed to enlarging the grain size which implies a decrease in the number of grain boundaries [18,49]. Fig.…”

Transport properties of the system Bi2Te2.7Se0.3−xPbxfabricated by a conventional melting technique

“…This may be reasonable because in Bi 2 Te 2.7 Se 0.3−x Pb x the Te and Bi atoms can be substituted by Se and Pb atoms, respectively, and crystallize in the same rhombohedral Bi 2 Te 3 structure, while a high temperature is needed to form PbTe and PbSe phases in a rock-salt-type crystal structure [20][21][22]. Furthermore, the formation of ternary and quaternary phases requires high dopant concentration and high syntheses pressure [23,24], which are not realized in this work. The sharpness of the peaks denotes the polycrystalline nature of all the samples.…”