Thermoelectric properties of the LaCoO3-LaCrO3 system using a high-throughput combinatorial approach
Winnie K. Wong-Ng, Kevin R. Talley, Nam T. Nguyen, Joshua B. Martin, Yanliang Zhang, Sara C. Barron, Xueyan Song
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.