arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.00563cond-mat.mtrl-scicond-mat.mes-hall
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快重离子辐照GaSb:从离子径迹到纳米多孔网络

Swift heavy ion irradiation of GaSb: from ion tracks to nano-porous networks

C. Notthoff, S. Jordan, A. Hadley, P. Mota-Santiago, R. G. Elliman, W. Lei, N. Kirby, P. Kluth

摘要:

研究了185 MeV $^{197}$ Au快重离子辐照引起的GaSb晶体中离子径迹的形成、非晶化和孔隙的形成随能量密度和辐照角度的变化。RBS/C和SAXS显示离子轨道半径在3 nm和5 nm之间。所观察到的孔的形态和饱和膨胀的GaSb薄膜显示出很强的照射角度依赖性。拉曼光谱和扫描电子显微镜表明,离子轨道作为一个来源的应变在材料中,导致宏观塑性流动在高能量密度和正常的照射。结果与玻璃的离子锤击模型一致。此外,广角X-射线散射揭示了形成纳米微晶内,否则无定形GaSb后发病的孔隙率。

英文摘要:

Ion track formation, amorphisation, and the formation of porosity in crystalline GaSb induced by 185 MeV $^{197}$Au swift heavy ion irradiation is investigated as a function of fluence and irradiation angle relative to the surface normal. RBS/C and SAXS reveal an ion track radius between 3 nm and 5 nm. The observed pore morphology and saturation swelling of GaSb films shows a strong irradiation angle dependence. Raman spectroscopy and scanning electron microscopy show that the ion tracks act as a source of strain in the material leading to macroscopic plastic flow at high fluences and off normal irradiation. The results are consistent with the ion hammering model for glasses. Furthermore, wide angle X-ray scattering reveals the formation of nano crystallites inside otherwise amorphous GaSb after the onset of porosity.

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