Experimental and modeling analysis of p-type Bi0.4Sb1.6Te3 and graphene nanocomposites

Optimization of the Consolidation Parameters for Enhanced Thermoelectric Properties of Gr-Bi2Te2.55Se0.45 Nanocomposites

“…The noticeable effect of temperature in their study may be attributed to the low pressure of 60 MPa and long holding times of 2, 4, and 5 h, giving more room and time for particle adhesion. In our study, high density (7.67 g/cm 3 ) was obtained at a much shorter time and a lower temperature, indicating that adequately optimized pressing conditions could play an essential role in improving element migration and mass transfer, which boost densification during the HP process. It was also noticed here that the high temperature of 400 • C cracks the pellets (Figure 5).…”

“…These results suggest that the Gr-Bi 2 Te 2.55 Se 0.45 alloy can endure a maximum pressure and heat of about 1 GPa and 350 • C, respectively. According to the results in Figure 4, these conditions yield a maximum density of 7.67 g/cm 3 .…”

“…The density of HP samples at different temperatures and pressure conditions is presented in Figure 4. As presented, when the temperature was fixed at 300 °C (black curve), increasing the pressure raised the density from 7.44 ± 0.02 g/cm 3 at 0.1 GPa to a maximum density of 7.67 ± 0.03 g/cm 3 for the sample pressed at 1.5 GPa. This increment in density could be a ributed to the higher pressing forces used, which led to be er adhesion of the particles.…”

“…where S is the Seebeck coefficient, σ is the electrical conductivity, T is the absolute temperature, and κ is the total thermal conductivity [3]. A combination of high-power factor (S 2 σ) and low κ is desired to achieve high performance in a TE device.…”

Microstructural Effect on the Corrosion Behavior of N- and P-Type Bismuth Tellurides Fabricated by Induction Melting

“…In the present work, the corrosion behavior for undoped Bi 2 Te 3 and two optimized doped alloys, Bi 2 Te 2.55 Se 0.45 (n-type) and Bi 0.4 Sb 1.6 Te 3 (p-type), fabricated by induction melting is explored. The chosen compositions for the n-and p-type alloys are based on recent reported compositions which are expected to have optimum thermoelectric performance [2,7,8]. In addition, the study evaluates the electrochemical responses in 3.5 wt% NaCl solution at room temperature through potentiodynamic polarization and electrochemical impedance spectroscopy (EIS).…”