Preparation and thermoelectric properties of the LuxBisub>2-xTe3 alloys with nanoflower morphology

doi:10.3969/j.issn.1000-1565.2023.01.009

Abstract

Abstract: The Bi₂Te₃ based materials have good thermoelectric properties around room temperatures. The themoelectric properties of the Bi₂Te₃ based alloys can be improved by nanotechnology and element doping. In this paper the LuxBi_2-xTe₃ nanopowders with nanoflowers morphology were synthesize by hydrothermal method, and the phase structure and micro-topography of the nanopowders were investigated by X-ray diffractometer(XRD)and a field-emission scanning electron microscopy(FESEM). The effects of the Lu doping and the ethylene diamine tetraacetic acid(EDTA)amounts on the morphology of the nanopowders were investigated. The results showed that the Lu doping is not beneficial to form nanoflowers morphology, and it is vital to select proper amounts of EDTA for forming nanoflowers morphology of the nanopowders. Subsequently, the LuxBi_2-xTe₃ bulk were synthesized by hot- DOI:10.3969/j.issn.1000-1565.2023.01.009具有花状形貌LuxBi_2-xTe₃合金的制备及性能吴芳¹,王伟² (1.河南财政金融学院人工智能学院,河南郑州 450046;2.郑州工程技术学院信息工程学院,河南郑州 450044)摘要:Bi₂Te₃基材料在室温附近具有良好的热电性能,通过掺杂和纳米技术可以提高Bi₂Te₃基热电材料的热电性能,其主要由热电优值(ZT)决定.本文通过水热法成功制备了具有纳米花形貌的LuxBi_2-xTe₃粉体,并对制备的纳米粉体分别进行XRD和SEM表征,讨论了Lu元素掺杂和乙二胺四乙酸(EDTA)用量对LuxBi_2-xTe₃纳米花粉体形貌的影响,结果表明:Lu元素掺杂不利于纳米花形貌的形成,而EDTA用量的合适选取对于纳米花形貌的形成起着至关重要的作用.接着采用热压法将LuxBi_2-xTe₃纳米花粉体压制成致密块体,讨论了Lu元素掺杂对LuxBi_2-xTe₃块体热电性能的影响,结果表明:Lu掺杂和纳米花形貌有利于提高样品的功率因子同时保持较低的热导率,从而可以达到较高的ZT值;Lu_0.2Bi_1.8Te₃样品和Lu_0.25Bi_1.75Te₃样品的ZT值均高于区域熔炼商用Bi₂Te₃块体的值,并且Lu_0.25Bi_1.75Te₃样品的ZT值在测温范围内均高于1,其ZT值在473 K时达到了1.14,高于其他相关报道的n型块体的值.这一研究为提高Bi₂Te₃基合金热电材料的热电性能提供了一个新的途径.关键词:LuxBi_2-xTe₃粉体;Lu元素掺杂;EDTA用量;纳米花形貌;热电性能中图分类号:TG146.4 文献标志码:A 文章编号:1000-1565(2023)01-0058-09Preparation and thermoelectric properties of the Lu_xBi_<sub>2-xTe₃ alloys with nanoflower morphologyWU Fang¹, WANG Wei²(1.College of Artificial Intelligence, Henan Finance University, Zhengzhou 450046, China;2.College of Information Engineering, Zhengzhou University of Technology, Zhengzhou 450044, China)Abstract: The Bi₂Te₃ based materials have good thermoelectric properties around room temperatures. The themoelectric properties of the Bi₂Te₃ based alloys can be improved by nanotechnology and element doping. In this paper the LuxBi_2-xTe₃ nanopowders with nanoflowers morphology were synthesize by hydrothermal method, and the phase structure and micro-topography of the nanopowders were investigated by X-ray diffractometer(XRD)and a field-emission scanning electron microscopy(FESEM). The effects of the Lu doping and the ethylene diamine tetraacetic acid(EDTA)amounts on the morphology of the nanopowders were investigated. The results showed that the Lu doping is not beneficial to form nanoflowers morphology, and it is vital to select proper amounts of EDTA for forming nanoflowers morphology of the nanopowders. Subsequently, the LuxBi_2-xTe₃ bulk were synthesized by hot- 收稿日期:2022-05-23 基金项目:河南省重点科技攻关项目(212102210599) 第一作者:吴芳(1982—),女,河南焦作人,河南财政金融学院副教授,博士,主要从事薄膜材料、热电材料等方向研究.E-mail:fwu082@126.com第1期吴芳等:具有花状形貌LuxBi_2-xTe₃合金的制备及性能pressing method, and the effects of the Lu doping on the thermoelectric properties of the LuxBi_2-xTe₃ bulk were also investigated. The results showed that the Lu doping and the nanoflowers morphology are helpful to increase the power factor and are also helpful to keep lower thermal conductivity, leading to a high ZT value. The ZT values of the Lu_0.2Bi_1.8Te₃ and Lu_0.25Bi_1.75Te₃ sample are all higher than the commercial zone melting Bi₂Te₃ ingots. And the ZT values of the Lu_0.25Bi_1.75Te₃ sample are all higher than 1 in the whole testing temperature range, and the optimum value reached 1.14 at 473 K which is higher than that of other reported n type Bi₂Te₃. This study provides a new way to improve the thermoelectric properties of the Bi₂Te₃ based alloys.

Key words: LuxBi_2-xTe₃ nanopodwers, the Lu doping, the EDTA amounts, nanoflowers morphology, thermoelectric properties

CLC Number:

TG146.4

WU Fang, WANG Wei. Preparation and thermoelectric properties of the Lu_xBi_<sub>2-xTe₃ alloys with nanoflower morphology[J]. Journal of Hebei University(Natural Science Edition), 2023, 43(1): 58-66.

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Preparation and thermoelectric properties of the Lu_xBi_<sub>2-xTe₃ alloys with nanoflower morphology

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