Thermoelectric properties of Ag2S superionic conductor with intrinsically low lattice thermal conductivity
文献类型：期刊论文
| 作者 | Wang Tuo; Chen Hong-Yi; Qiu Peng-Fei; Shi Xun; Chen Li-Dong |
| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2019-05-05 |
| 卷号 | 68期号:9 |
| 关键词 | thermoelectric superionic conductor phase transition lattice thermal conductivity |
| ISSN号 | 1000-3290 |
| DOI | 10.7498/aps.68.20190073 |
| 文献子类 | Article |
| 英文摘要 | Recently, Ag2S superionic conductor has attracted great attention due to its metal-like ductility and deformability. In this work, the single phase Ag2S compound is fabricated by the melting-annealing method. The crystal structure, ionic conduction, and electrical and thermal transports in a temperature range of 300-600 K are systematically investigated. The monoclinic-cubic crystal structure transition occurs around 455 K for Ag2S. Significant reduction in the specific heat at constant volume below the Dulong-Petit limit is observed for Ag2S after the monoclinic-cubic phase transition, which is attributed to the liquid-like Ag ions existing inside the sulfur framework. Ag2S shows typical semiconducting-like electrical transport behavior in the whole measured temperature range. Around 455 K, the ionic conductivity, carrier concentration, carrier mobility, electrical conductivity, and Seebeck coefficient each show an abrupt change. The calculated ionic activation based on the ionic conductivity is 0.076 eV for the body centered cubic Ag2S. The calculated band gap based on the electrical conductivity decreases from 1.1 eV for the monoclinic Ag2S to 0.42 eV for the body centered cubic Ag2S. The abrupt increase of electrical conductivity after the monoclinic-cubic phase transition leads to a maximum power factor around 5 mu W.cm(-1).K-2 at 550 K. In the whole measured temperature range, Ag2S demonstrates an intrinsically low lattice thermal conductivity (below 0.6 W.m(-1).K-1). The calculated phonon dispersion indicates that the weak chemical bonding between Ag and S is responsible for the low lattice thermal conductivity observed in the monoclinic Ag2S. Likewise, the presence of liquid-like Ag ions with low ionic activation energy is responsible for the low lattice thermal conductivity for the cubic Ag2S. Finally, the Ag2S shows the maximum thermoelectric figure of merit of 0.55 at 580 K, which is comparable to the thermoelectric figure of merit reported before in most of Ag-based thermoelectric superionic conductors. |
| WOS研究方向 | Physics |
| 语种 | 中文 |
| 出版者 | CHINESE PHYSICAL SOC |
| 源URL | [http://ir.sic.ac.cn/handle/331005/27125]  |
| 专题 | 中国科学院上海硅酸盐研究所 |
| 推荐引用方式 GB/T 7714 | Wang Tuo,Chen Hong-Yi,Qiu Peng-Fei,et al. Thermoelectric properties of Ag2S superionic conductor with intrinsically low lattice thermal conductivity[J]. ACTA PHYSICA SINICA,2019,68(9). |
| APA | Wang Tuo,Chen Hong-Yi,Qiu Peng-Fei,Shi Xun,&Chen Li-Dong.(2019).Thermoelectric properties of Ag2S superionic conductor with intrinsically low lattice thermal conductivity.ACTA PHYSICA SINICA,68(9). |
| MLA | Wang Tuo,et al."Thermoelectric properties of Ag2S superionic conductor with intrinsically low lattice thermal conductivity".ACTA PHYSICA SINICA 68.9(2019). |
入库方式： OAI收割
来源：上海硅酸盐研究所
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