Thermoelectric Properties of Ca3−x Dy x Co3.95Ga0.05O9+δ
Source abstract
Abstract
Ca3Co4O9+δ and Ca3−xDyxCo3.95Ga0.05O9+δ (x = 0.05, 0.10) samples were prepared by conventional solid-state synthesis, and their thermoelectric properties measured at 25 K to 300 K. The x-ray diffraction patterns revealed that all the samples are single phase. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The highest power factor among all the samples (2.45 μW cm−1 K−2 at 132 K) was obtained for Ca2.9Dy0.1Co3.95Ga0.05O9+δ, being about 80% higher than that of the undoped sample. Ca2.9Dy0.1Co3.95 Ga0.05O9+δ had the highest dimensionless figure of merit of 0.033 at 300 K, representing an improvement of about 74% compared with undoped Ca3Co4O9+δ.
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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.
References (40)
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