Thermoelectric properties of Ca3Co4O9+δ with Lu substitution
Source abstract
Abstract
A series of Ca3−xLuxCo4O9+δ (x = 0, 0.1, 0.2, and 0.4) has been prepared by sol–gel method. The effects of Lutetium substitution on thermoelectric properties of Ca3Co4O9+δ have been systematically investigated from 4 to 335 K. With the partial substitution of Lu3+ for Ca2+, the resistivity and thermopower for Lu-doped samples increase, while their thermal conductivity decreases. The dimensionless figure of merit for Ca2.8Lu0.2Co4O9+δ material (ZT = 0.032) is about five times better than that for Ca3Co4O9+δ (ZT = 0.007) at 335 K. Strikingly, for Lu-doped samples, the thermopower exhibits a steeper upturn at low temperatures.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal Expansion and Ionic Conductivity · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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