Epsilon-negative BaTiO3/Cu composites with high thermal conductivity and yet low electrical conductivity
| Autor: | Peitao Xie, Runhua Fan, Kai Sun, Qilin Gu, John Wang, Yao Liu, Zhongyang Wang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Permittivity
Materials science Composite number Metals and Alloys 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Drude model 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Thermal conductivity Electrical resistivity and conductivity lcsh:TA401-492 lcsh:Materials of engineering and construction. Mechanics of materials Composite material 0210 nano-technology Absorption (electromagnetic radiation) Temperature coefficient Microwave |
| Zdroj: | Journal of Materiomics, Vol 6, Iss 1, Pp 145-151 (2020) |
| ISSN: | 2352-8478 |
| Popis: | s: Epsilon-negative materials with high thermal conductivity and low electrical conductivity are of great importance for high power microwave devices. In this work, BaTiO3/Cu composites, as a class of epsilon-negative materials, are rationally designed to achieve a high thermal conductivity yet maintaining the electrical insulative character. Negative permittivity behavior induced by dielectric resonance and plasma oscillation is observed in these BaTiO3/Cu composites, which can be explained by the Lorentz and Drude model respectively. An outstanding absorption ability is achieved near the zero-cross point of the permittivity. Benefiting from the positive temperature coefficient of resistance and the weak temperature dependence of thermal conductivity in BaTiO3/Cu composites, sample containing 22.3 vol% of Cu content exhibits a thermal conductivity of up to 17.7 W/(m·k) and an electrical conductivity down to 0.0022 (Ω cm)−1 at 150 °C. Therefore, BaTiO3/Cu composite is a promising candidate for applications in electromagnetic attenuation and thermal management. Keywords: BaTiO3/Cu composite, Negative permittivity, Percolation, Thermal conductivity, Electrical conductivity |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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