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| PREPARATION OF Na1.4Co2O4 BASED THERMOELECTRIC MATERIALS BY SOL-GEL METHOD AND CHARACTERIZATION |
| LI Ying, MA Beiyue, WANG Zhenming, JIANG Maofa |
| School of Materials and Metallurgy, Northeastern University, Shenyang 110819 |
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Cite this article:
LI Ying MA Beiyue WANG Zhenming JIANG Maofa. PREPARATION OF Na1.4Co2O4 BASED THERMOELECTRIC MATERIALS BY SOL-GEL METHOD AND CHARACTERIZATION. Acta Metall Sin, 2011, 47(1): 109-114.
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Abstract Sr, Li and Cu-doped Na1.4Co2O4 based thermoelectric materials were prepared by sol-gel process. The phase constitution of Na1.4Co2O4 based thermoelectric materials was analyzed by XRD. According to DTA-TG curves, the pre-sintering and sintering temperatures of the materials were obtained to be 450 ℃ and 850 ℃, respectively. The influences of doping amount on the electrical resistivity, Seebeck coefficient and power factor of Na1.4Co2O4 based materials were investigated. The results showed that doping Li could decrease the electrical resistivity of Na1.4Co2O4, doping Sr and Cu could increase the electrical resistivity. Doping Li and Cu could improve the Seebeck coefficient and power factor of Na1.4Co2O4. The improving effect on Na1.4Co2O4 by doping Sr is not remarkable but by doping Li is the best. When 0.40 Li was doped, the power factor of Na1.0Li0.4Co2O4 at 15 ℃ reaches maximum value of 7444.73 μW?m-1?K-2.
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Received: 23 July 2010
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| Fund: Supported by National Natural Science Foundation of China (Nos.51074038 and 50774018) |
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