Thermoelectric properties of the LaCoO 3 -LaCrO 3 system using a high-throughput combinatorial approach

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Solid State Sciences, ISSN: 1293-2558, Vol: 64, Page: 7-12

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Talley, K. R.; Barron, S. C.; Nguyen, N.; Wong-Ng, W.; Martin, J.; Zhang, Y. L.; Song, X.
Elsevier BV
Chemistry; Materials Science; Physics and Astronomy; LaCo1-xCrxO3 solid solution; thermoelectric properties; combinatorial approach; PLD films; distorted perovskite; Biomedical Engineering and Bioengineering; Mechanical Engineering
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article description
A combinatorial film of the LaCo 1-x Cr x O 3 system was fabricated using the LaCoO 3 and LaCrO 3 targets at the NIST Pulsed Laser Deposition (PLD) facility. As the ionic size of Cr 3+ is greater than that of Co 3+, the unit cell volume of the series increases with increasing x. Using a custom screening tool, the Seebeck coefficient of LaCo 1-x Cr x O 3 approaches a measured maximum of 286 μV/K, near to the cobalt-rich end of the film library (with x ≈ 0.49). The resistivity value increases continuously with increasing x. The measured power factor, PF, of this series, which is related to the efficiency of energy conversion, also exhibits a maximum at the composition of x ≈ 0.49, which corresponds to the maximum value of the Seebeck coefficient. Our results illustrate the efficiency of applying the high-throughput combinatorial technique to study thermoelectric materials.