摘要
Single-crystalline samples of Eu/Ba-filled Sn-based type-Ⅷ clathrate are prepared by the Ga flux method with different stoichiometric ratios. The electrical transport properties of the samples are optimized by Eu doping. Results indicate that Eu atoms tend to replace Ba atoms. With the increase of the Eu initial content, the carrier density increases and the carrier mobility decreases, which leads to an increase of the Seebeck coefficient. By contrast, the electrical conductivity decreases. Finally, the sample with Eu initial content of x = 0.75 behaves with excellent electrical properties, which shows a maximal power factor of 1.51 mW·m^-1K^-2 at 480K, and the highest ZT achieved is 0.87 near the temperature of 483K.
Single-crystalline samples of Eu/Ba-filled Sn-based type-Ⅷ clathrate are prepared by the Ga flux method with different stoichiometric ratios. The electrical transport properties of the samples are optimized by Eu doping. Results indicate that Eu atoms tend to replace Ba atoms. With the increase of the Eu initial content, the carrier density increases and the carrier mobility decreases, which leads to an increase of the Seebeck coefficient. By contrast, the electrical conductivity decreases. Finally, the sample with Eu initial content of x = 0.75 behaves with excellent electrical properties, which shows a maximal power factor of 1.51 mW·m^-1K^-2 at 480K, and the highest ZT achieved is 0.87 near the temperature of 483K.
作者
邓书平
程峰
李德聪
唐语
陈钟
申兰先
刘虹霞
杨培志
邓书康
Shu-Ping Deng Feng Cheng De-Cong Li Yu Tang Zhong Chen Lan-Xian Shen Hong-Xia Liu Pei-Zhi Yang Shu-Kang Deng(Key Laboratory of Renewable Energy Advanced Materials and Manufacturing Technology （Ministry of Education） Yunnan Normal University, Kunming 650500 Photoelectric Engineering College, Yunnan Open University, Kunming 650500)
基金
Supported by the National Natural Science Foundation of China under Grant No 51262032
