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Synthesis and High Temperature Thermoelectric Characterization of Y₁₋ₓCaₓCoO₃ and YCo₁₋ₓRhₓO₃

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  • In this study, the effects of A and B site cation substitution of the distorted perovskite YCoO₃ on crystal structure and thermoelectric properties were investigated. Polycrystalline samples of Y₁₋ₓCaₓCoO₃ (0 ≤ x ≤ 0.20) and YCo₁₋ₓRhₓO₃ (0 ≤ x ≤ 1.0) were prepared by solid state reaction. Optimal synthesis conditions were determined to be 1198K in oxygen for Y₁₋ₓCaₓCoO₃, and 1273K/1373K in oxygen/vacuum for YCo₁₋ₓRhₓO₃. Powder x-ray diffraction patterns were collected and all samples were confirmed to be of the same orthorhombic space group (Pbnm) as the parent compound. Scanning electron microscopy and energy dispersive spectrometry were performed on Y₁₋ₓCaₓCoO₃ and both the nominal phase as well as Y₂O₃ was discovered. Very small amounts of Y₂O₃ impurity were detected in all samples by x-ray diffraction, consistent with previous studies. Crystal refinements, as well as electrical and thermal conductivity and Seebeck coefficient measurements from 300K to 800K are currently in progress.
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  • National Science Foundation; The City College of New York; Oregon State University
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