Investigation of the thermal conductivities across metal-insulator transition in polycrystalline VO2 |
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| Authors: | JiKun Chen XinLing Liu Xun Yuan YuLiang Zhang YanFeng Gao YanFei Zhou RuiHeng Liu LiDong Chen NuoFu Chen |
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| Institution: | 1. School of Renewable Energy, North China Electric Power University, Beijing, 102206, China
2. CAS Key laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
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| Abstract: | Previous reports about the thermal conductivities of VO2 showed various temperature dependences across metal-insulator transition (MIT) temperature. In this work, polycrystalline VO2 samples were fabricated by spark plasma sintering of VO2 powder. Temperature dependences of their thermal conductivities were investigated using laser flash technique, and the thermal conductivity showed a significant decrease trend from metal-phase to insulator phase. Electrical transport properties were investigated to confirm both carrier and lattice contribution to the thermal conductivity. It is found that the lattice thermal conductivity decreased significantly across MIT point, which may be caused by soft phonon mode in metal phase of VO2. |
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| Keywords: | thermal conductivity phase transformation VO2 |
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