XRD pattern of hydrothermally synthesized PbS powder.
SEM image of hydrothermally synthesized PbS powder.
XRD patterns of high pressure sintered bulk PbS doped with Bi.
SEM image of high pressure sintered bulk sample PbS.
Table 1
Electrical transport properties of PbS and Bi doped PbS samples (BixPb1−xS) at room temperature.
| Sample | Carrier concentration [1018 cm−3] | Hall mobility [cm2/V·s] | Hall coefficient RH [cm−3] | Resistivity [10−3 Ω·cm] | Seebeck coefficient S [μV/K] |
|---|---|---|---|---|---|
| PbS | 7.36 | 94.12 | 0.85 | 9.02 | 220.44 |
| Bi0.005Pb0.995S | 26.31 | 3.313 | −0.24 | 71.61 | −134.29 |
| Bi0.01Pb0.99S | 45.215 | 133.99 | −0.14 | 1.03 | −112.27 |
| Bi0.0l5Pb0.985S | 45.387 | 126.83 | −0.14 | 1.08 | −48.48 |
Temperature dependence of Seebeck coefficient for PbS and Bi0.01Pb0.99S.
Temperature dependence of electrical resistivity for PbS and Bi0.01Pb0.99S.
Table 2
The values of ρ, a and γ obtained from the formula ρ = ρ0+aTγ.
| Sample | ρ [10 −6Ω·cm] | a(10−16) | γ |
|---|---|---|---|
| PbS | 67.55 | 2.68 | 10.82 |
| Bi0.01Pb0.99S | 11.43 | 4.82 | 6.12 |
Temperature dependence of power factor for PbS and Bi0.01Pb0.99S.
Temperature dependence of thermal conductivity for PbS and Bi0.01Pb0.99S.
Temperature dependence of ZT of PbS and Bi0.01Pb0.99S.