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Thermoelectric properties of the LaCoO3-LaCrO3 system using a high-throughput combinatorial approach

Published

Author(s)

Winnie K. Wong-Ng, Kevin R. Talley, Nam T. Nguyen, Joshua B. Martin, Yanliang Zhang, Sara C. Barron, Xueyan Song

Abstract

A combinatorial film of the LaCo1-xCrxO3 system was fabricated using the LaCoO3 and LaCrO3 targets at the NIST Pulsed Laser Deposition (PLD) facility. As the ionic size of Cr3+ is greater than that of Co3+, the unit cell volume of the series increases with increasing x. Using a custom screening tool, the Seebeck coefficient of LaCo1-xCrxO3 approaches a maximum of 287 uV/K at a distance of 43.5 mm from the cobalt-rich end of the film library (estimated x value around ≈ 0.49), while the resistivity value increases continuously as x approaches our measurement limit of ≈ 0.80. The high resistivity values render the measurement of Seebeck coefficient less reliable when x > 0.6. The power factor, PF, of this series exhibits a maximum at the composition of x=0.49, which approximately corresponds to the maximum value of the Seebeck coefficient.
Citation
Materials Letters
Volume
64

Keywords

LaCo1-xCrxO3 solid solution, thermoelectric properties, combinatorial approach, PLD films, distorted perovskite
Created December 9, 2016, Updated November 10, 2018