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Thickness dependence of microstructure and properties in Be2C coatings as a promising ablation material

Thickness dependence of microstructure and properties in Be2C coatings as a promising ablation material

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摘要

Beryllium carbide (Be2C) thin films have proven to be promising ablation materials, but the properties of Be2C coatings of the greater thickness required for inertial confinement fusion capsules are still unknown. In this work, Be2C coatings of various thicknesses (0.3–32.9 μm) are prepared by DC reactive magnetron sputtering. The influence of thickness on crystal properties, microstructure, and optical properties is investigated. The results indicate that the crystallinity of polycrystalline Be2C films improves with increasing thickness, while the grain size (~5 nm) and texture properties (without a preferred orientation) have only a weak dependence on thickness. A uniform featureless microstructure and smooth surface (root mean square roughness ~8 nm) are observed even in thick (32.9 μm) films, despite the presence of defects induced by contaminants. High densities (2.19–2.31 g/cm3) and high deposition rates (~270 nm/h) are realized, with the latter corresponding to the upper limit for the fabrication of Be2C coatings by magnetron sputtering. The transmittance of the films in the near-infrared region remains at a high level (>80%) and has only a weak dependence on thickness, while the transmittance in the visible region decreases with increasing thickness. In addition, the optical bandgap is estimated to be about 1.9 eV and decreases with increasing thickness owing to the presence of defects.

Abstract

Beryllium carbide (Be2C) thin films have proven to be promising ablation materials, but the properties of Be2C coatings of the greater thickness required for inertial confinement fusion capsules are still unknown. In this work, Be2C coatings of various thicknesses (0.3–32.9 μm) are prepared by DC reactive magnetron sputtering. The influence of thickness on crystal properties, microstructure, and optical properties is investigated. The results indicate that the crystallinity of polycrystalline Be2C films improves with increasing thickness, while the grain size (~5 nm) and texture properties (without a preferred orientation) have only a weak dependence on thickness. A uniform featureless microstructure and smooth surface (root mean square roughness ~8 nm) are observed even in thick (32.9 μm) films, despite the presence of defects induced by contaminants. High densities (2.19–2.31 g/cm3) and high deposition rates (~270 nm/h) are realized, with the latter corresponding to the upper limit for the fabrication of Be2C coatings by magnetron sputtering. The transmittance of the films in the near-infrared region remains at a high level (>80%) and has only a weak dependence on thickness, while the transmittance in the visible region decreases with increasing thickness. In addition, the optical bandgap is estimated to be about 1.9 eV and decreases with increasing thickness owing to the presence of defects.

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DOI:10.1063/1.5087112

所属栏目:Laser and Particle Beam Fusion

收稿日期:2018-12-28

修改稿日期:2019-04-06

网络出版日期:2019-11-08

作者单位    点击查看

Yudan He:Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China
Lei Jin:Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China
Jiqiang Zhang:Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China
Bingchi Luo:Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China
Kai Li:Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China
Weidong Wu:Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, ChinaScience and Technology on Plasma Physics Laboratory, Mianyang 621900, ChinaIFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
Jiangshan Luo:Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, ChinaScience and Technology on Plasma Physics Laboratory, Mianyang 621900, China

联系人作者:Jiangshan Luo(jiangshanluo@caep.cn)

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引用该论文

Yudan He,Lei Jin,Jiqiang Zhang,Bingchi Luo,Kai Li,Weidong Wu,Jiangshan Luo. Thickness dependence of microstructure and properties in Be2C coatings as a promising ablation material[J]. Matter and Radiation at Extremes, 2019, 4(4): 045403

Yudan He,Lei Jin,Jiqiang Zhang,Bingchi Luo,Kai Li,Weidong Wu,Jiangshan Luo. Thickness dependence of microstructure and properties in Be2C coatings as a promising ablation material[J]. Matter and Radiation at Extremes, 2019, 4(4): 045403

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