Thermoelectric Properties of $R_{1-x}$Sr$_{x}$CoO$_{3}$ Perovskites

ORAL

Abstract

Cobalt oxide materials have recently shown promise for use in thermoelectric applications due to enhancement of the Seebeck coefficient ($S)$ by the spin and orbital degeneracy of the Co$^{3+}$ and Co$^{4+}$ ions. We have studied Sr substituted $R$CoO$_{3}$ ($R$ = rare earth elements) perovskites that exhibit increased transition temperatures to the low-spin ground state, which is required for achieving enhanced $S$. We have found that Gd is the smallest $R$ for which the homogenous Sr substitution is possible. We will present structural and thermoelectric properties of these materials with 0 $< \quad x \quad <$ 0.5. We will describe our search for materials with optimal degeneracy ratios, which are stable within practical operating temperature ranges for thermoelectric applications.

–

Authors

  • S. Boona

    Physics Department, Northern Illinois University, DeKalb, IL 60115

  • B. Dabrowski

    MSD, Argonne National Laboratory, and Physics, Northern Illinois University, De Kalb IL, USA, Physics Department, Northern Illinois University, DeKalb, IL 60115, Physics Department, Northern Illinois University, DeKalb, IL 60115 and Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, Department of Physics, Northern Illinois University, DeKalb, IL and Materials Science Division, Argonne National Laboratory, Argonne, IL, Northern Illinois University, Physics Department, Northern Illinois University, DeKalb IL 60115, Department of Physics, Northern Illinois University, DeKalb, IL 60115

  • S. Kolesnik

    Physics Department, Northern Illinois University, DeKalb, IL 60115, Department of Physics, Northern Illinois University, DeKalb, IL and Materials Science Division, Argonne National Laboratory, Argonne, IL, Physics Department, Northern Illinois University, DeKalb IL 60115, Department of Physics, Northern Illinois University, DeKalb, IL 60115

  • O. Chmaissem

    MSD, Argonne National Laboratory, and Physics, Northern Illinois University, De Kalb IL, USA, Physics Department, Northern Illinois University, DeKalb, IL 60115, Physics Department, Northern Illinois University, DeKalb, IL 60115 and Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, Department of Physics, Northern Illinois University, DeKalb, IL and Materials Science Division, Argonne National Laboratory, Argonne, IL, Department of Physics, Northern Illinois University, DeKalb, IL 60115