Thermophysical Properties of Metal-Insulator Transition Materials During Phase Transition for Thermal Control Devices
Thermophysical Properties of Metal-Insulator Transition Materials During Phase Transition for Thermal Control Devices
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DOI：
10.1016/j.ijheatmasstransfer.2020.120631
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发表时间：
2020-11
影响因子：
5.2
通讯作者：
A. Ueno;Jihoon Kim;H. Nagano
中科院分区：
文献类型：
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作者：
A. Ueno;Jihoon Kim;H. Nagano
本研究报告了金属-绝缘体过渡材料的制造以及其热物理性质（即比热、导热率和总半球发射率）对温度依赖性的测量，以评估这些材料作为多功能热控制器件的潜力。选择钙钛矿型氧化锰、La0.8Sr0.2MnO3(LSMO)和La0.8Pb0.2MnO3(LPMO)以及二氧化钒(VO2)作为候选材料。 LSMO和LPMO采用溶液燃烧和简单烧结方法制备，VO2采用放电等离子烧结方法制备。通过差示扫描量热法测量这些材料相变过程中的相变温度、比热容和储热能力。热导率通过交流量热法测量。使用稳态量热法测量总半球发射率。结果表明，VO2在相变过程中具有最高的储热能力。证实了相变前后LSMO和LPMO总半球发射率的较大变化以及VO2热导率的较大变化。此外，还制备了掺钨二氧化钒（VWO2），将相变温度降低到远低于VO2，并给出了其热物理性质的测量结果。
This study reports on the fabrication of metal-insulator transition materials and measurement of the temperature dependency of their thermophysical properties, namely, specific heat, thermal conductivity, and total hemispherical emittance to evaluate the potential of these materials as multifunctional thermal control devices. Perovskite-type manganese oxide, La0.8Sr0.2MnO3(LSMO) and La0.8Pb0.2MnO3(LPMO), and vanadium dioxide (VO2) are selected as candidate materials. LSMO and LPMO are prepared using the solution combustion and simple sintering methods, and VO2is prepared using the spark plasma sintering method. The phase transition temperatures, specific heat capacities, and heat storage capabilities during the phase transition of these materials are measured via differential scanning calorimetry. The thermal conductivities are measured via AC calorimetric method. The total hemispherical emittances are measured using the steady-state calorimetric method. Results show that VO2has the highest heat storage capability during phase transition. The large change in the total hemispherical emittances of LSMO and LPMO and the large change in the thermal conductivity of VO2before and after phase transition are confirmed. Moreover, tungsten-doped vanadium dioxide (VWO2) is fabricated to reduce the phase transition temperature to much lower than that of VO2, and the measurement results of its thermophysical properties are also presented.