PREPARATION OF Na1.4Co2O4 BASED THERMOELECTRIC MATERIALS BY SOL-GEL METHOD AND CHARACTERIZATION

doi:10.3724/SP.J.1037.2010.00370

Acta Metall Sin

2011, Vol. 47

Issue (1): 109-114 DOI: 10.3724/SP.J.1037.2010.00370

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PREPARATION OF Na_1.4Co₂O₄ 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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LI Ying MA Beiyue WANG Zhenming JIANG Maofa. PREPARATION OF Na_1.4Co₂O₄ 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 Na_1.4Co₂O₄ based thermoelectric materials were prepared by sol-gel process. The phase constitution of Na_1.4Co₂O₄ 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 Na_1.4Co₂O₄ based materials were investigated. The results showed that doping Li could decrease the electrical resistivity of Na_1.4Co₂O₄, doping Sr and Cu could increase the electrical resistivity. Doping Li and Cu could improve the Seebeck coefficient and power factor of Na_1.4Co₂O₄. The improving effect on Na_1.4Co₂O₄ by doping Sr is not remarkable but by doping Li is the best. When 0.40 Li was doped, the power factor of Na_1.0Li_0.4Co₂O₄ at 15 ℃ reaches maximum value of 7444.73 μW?m^-1?K^-2.

Key words: thermoelectric material cobaltite thermoelectric property doping sol-gel method

Received: 23 July 2010

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Supported by National Natural Science Foundation of China (Nos.51074038 and 50774018)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00370 OR https://www.ams.org.cn/EN/Y2011/V47/I1/109

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