Pardanaud C, Rusu M I, Martin C, Giacometti G, Roubin P, Ferro Y, Allouche A, Oberkofler M, Köppen M, Dittmar T, Linsmeier Ch
Laboratoire PIIM, Aix-Marseille Université/CNRS, Avenue escadrille Normandie-Niemen, 13397, Marseille, France.
J Phys Condens Matter. 2015 Dec 2;27(47):475401. doi: 10.1088/0953-8984/27/47/475401. Epub 2015 Nov 12.
We herein report on the formation of BeD2 nanocrystalline domes on the surface of a beryllium sample exposed to energetic deuterium ions. A polycrystalline beryllium sample was exposed to D ions at 2 keV/atom leading to laterally averaged deuterium areal densities up to 3.5 10(17) D cm(-2), and studied using nuclear reaction analysis, Raman microscopy, atomic force microscopy, optical microscopy and quantum calculations. Incorporating D in beryllium generates a tensile stress that reaches a plateau at ≈1.5 10(17) D cm(-2). For values higher than 2.0 10(17) cm(-2), we observed the growth of ≈90 nm high dendrites, covering up to 10% of the surface in some zones of the sample when the deuterium concentration was 3 × 10(17) D cm(-2). These dendrites are composed of crystalline BeD2, as evidenced by Raman microscopy and quantum calculations. They are candidates to explain low temperature thermal desorption spectroscopy peaks observed when bombarding Be samples with D ions with fluencies higher than 1.2 10(17) D cm(-2).
我们在此报告了在暴露于高能氘离子的铍样品表面形成BeD₂纳米晶穹顶的情况。将一个多晶铍样品暴露于能量为2 keV/原子的D离子下，导致横向平均氘面密度高达3.5×10¹⁷ D cm⁻²，并使用核反应分析、拉曼显微镜、原子力显微镜、光学显微镜和量子计算进行了研究。在铍中掺入D会产生拉伸应力，该应力在≈1.5×10¹⁷ D cm⁻²时达到平稳状态。对于高于2.0×10¹⁷ cm⁻²的值，当氘浓度为3×10¹⁷ D cm⁻²时，我们观察到在样品的某些区域中生长出了约90 nm高的枝晶，覆盖了高达10%的表面。这些枝晶由结晶的BeD₂组成，拉曼显微镜和量子计算证明了这一点。它们可以解释在用通量高于1.2×10¹⁷ D cm⁻²的D离子轰击Be样品时观察到的低温热脱附光谱峰。
