Thickness dependence of microstructure and properties in Be<sub>2</sub>C coatings as a promising ablation material

He Yudan; Jin Lei; Zhang Jiqiang; Luo Bingchi; Li Kai; Wu Weidong; Luo Jiangshan

doi:10.1063/1.5087112

Volume 4 Issue 4

Jul. 2019

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Article Navigation > Matter and Radiation at Extremes > 2019 > 4(4): 045403

He Yudan, Jin Lei, Zhang Jiqiang, Luo Bingchi, Li Kai, Wu Weidong, Luo Jiangshan. Thickness dependence of microstructure and properties in Be2C coatings as a promising ablation material[J]. Matter and Radiation at Extremes, 2019, 4(4): 045403. doi: 10.1063/1.5087112

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He Yudan, Jin Lei, Zhang Jiqiang, Luo Bingchi, Li Kai, Wu Weidong, Luo Jiangshan. Thickness dependence of microstructure and properties in Be₂C coatings as a promising ablation material[J]. Matter and Radiation at Extremes, 2019, 4(4): 045403. doi: 10.1063/1.5087112

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

doi: 10.1063/1.5087112

He Yudan¹,
Jin Lei¹,
Zhang Jiqiang¹,
Luo Bingchi¹,
Li Kai¹,
Wu Weidong^{1, 2, 3},
Luo Jiangshan^{1, 2
,
,}

1.
Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China
2.
Science and Technology on Plasma Physics Laboratory, Mianyang 621900, China
3.
IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China

More Information

Corresponding author: a)Author to whom correspondence should be addressed: jiangshanluo@caep.cn.
Received Date: 2018-12-28
Accepted Date: 2019-04-06

Available Online: 2021-04-15

Publish Date: 2019-07-15

Abstract

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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References(32)

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