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Open Access Nano Express

Thermoelectric properties of Ca0.8Dy0.2MnO3 synthesized by solution combustion process

Kyeongsoon Park* and Ga Won Lee

Author Affiliations

Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Korea

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Nanoscale Research Letters 2011, 6:548  doi:10.1186/1556-276X-6-548

Published: 5 October 2011

Abstract

High-quality Ca0.8Dy0.2MnO3 nano-powders were synthesized by the solution combustion process. The size of the synthesized Ca0.8Dy0.2MnO3 powders was approximately 23 nm. The green pellets were sintered at 1150-1300°C at a step size of 50°C. Sintered Ca0.8Dy0.2MnO3 bodies crystallized in the perovskite structure with an orthorhombic symmetry. The sintering temperature did not affect the Seebeck coefficient, but significantly affected the electrical conductivity. The electrical conductivity of Ca0.8Dy0.2MnO3 increased with increasing temperature, indicating a semiconducting behavior. The absolute value of the Seebeck coefficient gradually increased with an increase in temperature. The highest power factor (3.7 × 10-5 Wm-1 K-2 at 800°C) was obtained for Ca0.8Dy0.2MnO3 sintered at 1,250°C. In this study, we investigated the microstructure and thermoelectric properties of Ca0.8Dy0.2MnO3, depending on sintering temperature.

Keywords:
electrical conductivity; solution combustion process; Seebeck coefficient; power factor; Ca0.8Dy0.2MnO3