Stability of Y2O3 hydrogen isotope permeation barriers in hydrogen at high temperatures |
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| Authors: | Qun Li Jun Liu Wei-Ling Lv Li-Bin Mo Da-Wei Duan Hong-Wei Gu Fa-Zhu Ding Tao Tang De-Li Luo Jiang-Li Cao |
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| Affiliation: | 1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. Chinese Academy of Engineering Physics, P.O. Box 919-71, Mianyang 621907, Sichuan, China |
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| Abstract: | Hydrogen isotope permeation barriers (HIPB) have great potential applications in the fields of hydrogen energy and thermonuclear fusion energy. Here, we report the stability of Y2O3 HIPB in gaseous hydrogen at high temperatures including the structures, mechanical properties and electrical properties. With increasing hydrogen treatment time at 700 °C, the high-index diffractions of Y2O3 became weak gradually whereas the (400) diffraction was strengthened. The color of the Y2O3 HIPB changed from brown to gray. The bonding strength decreased by 61% with increasing hydrogen treatment time, and finally remained unchanged. Meanwhile, the electrical resistivity of the Y2O3 HIPB decreased from 8.2 × 109 Ω cm by over two orders of magnitude and then tended to be constant. The oxygen loss as well as hydrogen incorporation was proposed to be responsible for these modifications and indications of the present work for preparation of HIPB with high reliability were discussed. |
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| Keywords: | Thermonuclear fusion Hydrogen isotope permeation barriers Y2O3 Hydrogen treatment Thermal stability |
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