Preparation and Analysis of Novel Thermoelectric Material (Sr_xCa_1-x)₃Co₄O₉

Abstract:

Nanometer-sized (Sr_xCa_1-x)₃Co₄O₉ powders were prepared using the sol-gel process. Two Ca-Co-O ceramic thermoelectric materials were then prepared and characterized with X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The microstructure and thermoelectric properties of the ceramic materials were studied. The experimental results showed that the crystals of (Sr_xCa_1-x)₃CO₄ grew into materials with high density and low pore rate under optimal Sr-doped conditions. The (Sr_xCa_1-x)₃Co₄O₉ ceramic materials contain directional arrays with cube-shaped grains in a layered arrangement. The crystals were fully developed and the interface between layers was clear-cut. The thermoelectric properties of (Sr_xCa_1-x)₃Co₄O₉ ceramics were greatly improved, with high Seebeck coefficient and high electrical conductivity. The Seebeck Coefficient positively correlated with the rise of temperature.

• Periodical: Applied Mechanics and Materials (Volume 492)
• Pages: 326-330
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.492.326
• Online since: January 2014
• Authors: Jie Wang, Li Peng Zhang, Yan Li
• Keywords: (Sr_xCa_1-x)₃Co₄O₉, Microstructure, Thermoelectrcity, Thermoelectric Material

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