三位置掺杂对BiCuSeO功能陶瓷热电性能的影响

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Abstract BiCuSeO functional ceramics were doped by Bi/Cu/Se, and Bi_1-_xBa_x_/2Pb_x_/2Cu_1-_xNi_xSe_1-_xTe_xO (x=0, 0.02, 0.04, 0.06, 0.08, 0.10) ceramics were prepared by mechanical alloying (MA) and spark pressing sintering (SPS) process. The phase, microstructure, electrical transport parameters and thermal transport parameters were analyzed before and after doping to study the influence on the thermoelectric properties of BiCuSeO functional ceramics. The results indicate that three position doping can hybridize the beneficial effects of several elements, which can significantly improve the conductivity and power factor of BiCuSeO functional ceramics while maintaining a high Seebeck coefficient. The best doping amount x is 0.10. The highest power factor of 0.71 mW/(m∙K²) and the maximum thermal power value of 1.06 are obtained at 873 K, which are about 2.5 times and 2 times of undoped ceramics.

Key words： thermoelectric ceramics multi doping electrical transport properties thermal properties solid solution strengthening thermoelectric figure of merit

Received: 15 March 2021 Published: 26 September 2021

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	FENG Bo

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FENG Bo. Effect of three-position doping on thermoelectric properties of BiCuSeO based functional ceramics[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(4): 306-312.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I4/306

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