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材料导报  2020, Vol. 34 Issue (8): 8136-8140    https://doi.org/10.11896/cldb.19030096
  金属及金属基复合材料 |
Yb掺杂Ⅷ型YbxBa8-xGa16Sn30笼合物的制备及热电性能
申兰先1, 陈家莉1, 李德聪2, 刘文婷1, 葛文1, 邓书康1
1 云南师范大学可再生能源材料先进技术与制备教育部重点实验室, 云南省农村能源工程重点实验室,太阳能研究所,昆明 650500;
2 云南开放大学光电工程学院,昆明 650500
Preparation and Thermoelectric Properties of Yb Doped Type-Ⅷ YbxBa8-xGa16Sn30 Clathrate
SHEN Lanxian1, CHEN Jiali1, LI Decong2, LIU Wenting1, GE Wen1, DENG Shukang1
1 Solar Energy Research Institution, Yunnan Provincial Renewable Energy Engineering Key Lab, Education Ministry Key Laboratory of Renewable Energy Advanced Materials and Manufacturing Technology, Yunnan Normal University, Kunming 650500, China;
2 College of Optoelectronic Engineering, Yunnan Open University, Kunming 650500, China
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摘要 本研究采用Sn熔剂法成功制备出Yb掺杂Ⅷ型笼合物YbxBa8-xGa16Sn30(0≤x≤2)热电材料,通过测试其电导率、Seebeck系数和Hall系数等分析材料的电性能,并估算其ZT值。结果表明:掺入Yb后,材料的晶格常数随Yb含量的增加而减小。x=1.5样品的电导率在整个测试温度范围内均比其余样品高,相比x=0的样品,其电导率提高了约60%,这是由于在载流子迁移率相当的情况下该样品拥有较高的载流子浓度。此外,在300~583 K范围内,样品的电导率随温度的升高而降低,表现出重掺杂半导体特性;而在583 K以后,电导率随温度的升高而增大,表现出半导体特性。在测试温度范围内(300~600 K),所有样品的Seebeck系数绝对值均随温度的升高先增大后降低。在所有样品中,x=1.5的样品具有最高的电导率,其在489 K时获得最大功率因子,为2.43×10-3 W/(m·K2),在此温度下其ZT值为1.35。
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申兰先
陈家莉
李德聪
刘文婷
葛文
邓书康
关键词:  Yb掺杂  热电材料  Ⅷ型笼合物  热电性能    
Abstract: In this work, a successful effort was made in growing Yb-doped type-Ⅷ YbxBa8-xGa16Sn30 clathrate thermoelectric materials via a Sn-flux method.The electrical conductivity, Seebeck coefficient, and Hall coefficient of these samples were measured to analyze their electrical pro-perties,and ZT values were estimated. The results showed that the lattice constant of the material decreased with the increase of Yb content.The conductivity of the sample with x=1.5 was higher than that of other samples in the whole test temperature range, and the conductivity was improved by about 60% compared with that of the sample with x=0, which was due to higher carrier concentration when carrier mobility was comparable.In addition, the conductivity of the samples from 300 K to 583 K decreased with the increase of temperature, showing the characteristics of degenerate semiconductor. After 583 K, the conductivity increased with the increase of temperature, showing the characteristics of semiconductor. Within the test temperature range (300—600 K), the absolute value of Seebeck coefficient for all samples initially increased to a maximum value and subsequently decreased with the increase of temperature. The sample with x=1.5 obtained a large power factor with the maximum va-lue of 2.43×10-3 W/(m·K2) (at 489 K)due to its high conductivity, and the estimated ZT obtained a maximum value of 1.35 at 489 K.
Key words:  Yb doped    thermoelectric materials    type-Ⅷ clathrate    thermoelectric properties
                    发布日期:  2020-04-25
ZTFLH:  Q472+.7  
基金资助: 国家自然科学基金(61864012;21701140)
通讯作者:  skdeng@126.com   
作者简介:  申兰先,云南师范大学能源与环境科学学院,讲师。2016年12月获云南师范大学农业生物环境与能源工程专业工学博士学位,主要从事新能源材料与器件的研发。
邓书康,云南师范大学能源与环境科学学院,教授。2008年6月获武汉理工大学工学博士学位,主要从事新能源材料与器件的研发。
引用本文:    
申兰先, 陈家莉, 李德聪, 刘文婷, 葛文, 邓书康. Yb掺杂Ⅷ型YbxBa8-xGa16Sn30笼合物的制备及热电性能[J]. 材料导报, 2020, 34(8): 8136-8140.
SHEN Lanxian, CHEN Jiali, LI Decong, LIU Wenting, GE Wen, DENG Shukang. Preparation and Thermoelectric Properties of Yb Doped Type-Ⅷ YbxBa8-xGa16Sn30 Clathrate. Materials Reports, 2020, 34(8): 8136-8140.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19030096  或          http://www.mater-rep.com/CN/Y2020/V34/I8/8136
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