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Enhanced thermoelectric properties of n-type Bi2Te3-based nanocomposite fabricated by spark plasma sintering |
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| Authors: | Fei Li Xiangyang Huang Zhengliang Sun Juan Ding Jun JiangWan Jiang Lidong Chen |
| Affiliation: | a CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China b Graduate University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China c Division of Functional Materials and Nano Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China d College of Material Science and Engineering, Donghua University, 1882 West Yan-an Road, Shanghai 200051, China |
| Abstract: | Highly dense n-type Bi2Te3-based thermoelectric materials dispersed with x vol.% γ-Al2O3 nanoparticles (x = 0, 0.4, 1.0, 1.5) were fabricated by spark plasma sintering method. The effects of γ-Al2O3 addition on microstructure and the thermoelectric properties were studied. It was found that γ-Al2O3 nanoparticles locate both at grain boundaries and inside Bi2Se0.3Te2.7 grains. The nanoparticles induce both potential barrier scattering effect and additional phonon scattering effect, which simultaneously enhance the Seebeck coefficient and reduce the lattice thermal conductivity of the nanocomposites in the measured temperature range of 300-500 K, respectively. The maximum dimensionless figure of merit (ZTmax) reaches up to 0.99 for the sample with x = 1.0 at 400 K, which is 35% improvement over the Bi2Te3-based matrix. More importantly, the average ZT value of the sample increases from 0.65 to 0.91 in the temperature range 300-500 K, making the nanocomposites much more applicable in cooling and power generation. |
| Keywords: | Thermoelectric Al2O3 Bi2Te3 Nanoparticle |
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