Rapid fabrication and transport properties of n-type Co4−xNixSb12 via modified polyol process synthesis combined with evacuated-and-encapsulated sintering

Fast fabrication and enhancement of thermoelectric power factor of p-type nanostructured CoSb3(1+δ) (δ=0.00, 0.01 and 0.02) using solvothermal synthesis and evacuating-and-encapsulating sintering

“…The resistivity of all the samples decreases with increasing temperature, a typical characteristic of nonmetal-like temperature dependence. This behavior is similar to earlier reports [23][24][25][26]. Fig.…”

“…The resistivity of the CoSb 3(1 þ δ) at 350 K is 12 mΩ-cm, 20 mΩ-cm, and 27 mΩ-cm for δ¼ 0.00, 0.01 and 0.02, respectively. δ¼ 0 sample shows the lowest resistivity among the samples, which is lower than those prepared by hydrothermal (6.51 Ω-cm) [24] and polyol synthesis methods (0.38 Ω-cm) [25]. However, Mi et al [13] have reported a resistivity of 3.1 mΩ-cm and 3.6 mΩ-cm at 300 K for CoSb 3 using different consolidation processes.…”

“…8 shows the relation of ln σ versus T À 1/4 for CoSb 3(1 þ δ) with δ¼ 0.00, 0.01 and 0.02. Earlier researchers also reported that electrical resistivity follows variable-range hopping mechanism for CoSb 3 [25,[30][31][32]. Assuming the transport is dominated by the variable range hopping process, the thermopower can be expressed as follows [33]:…”

Low thermal conductivity and rapid synthesis of n-type cobalt skutterudite via a hydrothermal method

“…[16][17][18][19] We have recently reported a rapid synthesis of cobalt skutterudite using a modied polyol process. 25 However, there are some disadvantages of the polyol method. The triethylene glycol (TEG) used as the solvent in polyol synthesis is costly; the synthesized powders require 750 ml ethanol to rinse off viscous TEG.…”

Enhanced thermoelectric properties of hydrothermally synthesized Bi0.88−xZnxSb0.12 nanoalloys below the semiconductor–semimetal transition temperature

“…The standard four-probe and steady-state techniques were used for simultaneously measuring electrical resistivity and thermopower, respectively, between 25 K and 425 K. The temperature difference between hot and cold ends of the sample was measured using a type E differential thermocouple. 32 The temperature gradient between both ends of the sample is produced using a heater connected to one end of the sample. Thermal conductivity measurements were carried out via sandwiching a dual spiral sensor between a couple of pelleted samples using the Hot Disk plane source technique.…”