Grain-Size-Dependent Thermoelectric Properties of SrTiO3 3D Superlattice Ceramics |
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Authors: | Rui-zhi Zhang Kunihito Koumoto |
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Affiliation: | 1. Department of Physics, State Key Laboratory of Photoelectric Technology and Functional Materials (Culture Base), Northwest University, Xi’an, 710069, China 2. Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan 3. CREST, Japan Science and Technology Agency, Tokyo, 102-0075, Japan
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Abstract: | The thermoelectric (TE) performance of SrTiO3 (STO) 3D superlattice ceramics with 2D electron gas grain boundaries (GBs) was theoretically investigated. The grain size dependence of the power factor, lattice thermal conductivity, and ZT value were calculated by using Boltzmann transport equations. It was found that nanostructured STO ceramics with smaller grain size have larger ZT value. This is because the quantum confinement effect, energy filtering effect, and interfacial phonon scattering at GBs all become stronger with decreasing grain size, resulting in higher power factor and lower lattice thermal conductivity. These findings will aid the design of nanostructured oxide ceramics with high TE performance. |
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