铀基多层膜的研究：I.制造和结构表征
A study of uranium-based multilayers: I. Fabrication and structural characterisation
摘要：
本文讨论了一系列U/Fe、U/Co和U/Gd多层膜的结构特征。X射线反射率已被用来调查沿生长方向的层厚度和粗糙度参数和高角衍射测量已被用来确定层的晶体结构和取向。对于铀/过渡金属系统的情况，界面是扩散的，并且过渡金属以它们共同的体相的多晶形式存在，具有沿着最近堆积平面的优选取向;分别为Fe，bcc（110）和Co，hcp（001）。铀是一种结晶性差的斜方晶系，α-U状态。相比之下，U/Gd多层膜具有尖锐的界面，原子种类的混合可以忽略不计，并且具有粗糙度，这强烈依赖于钆层厚度。衍射光谱表明，在U和Gd层与强度一致的一个新的六方晶系U相的生长，稳定的六方晶系钆层的结晶度高。
英文摘要：
This paper addresses the structural characterisation of a series of U/Fe, U/Co and U/Gd multilayers. X-ray reflectivity has been employed to investigate the layer thickness and roughness parameters along the growth direction and high-angle diffraction measurements have been used to determine the crystal structure and orientation of the layers. For the case of uranium/transition metal systems, the interfaces are diffuse and the transition metals are present in a polycrystalline form of their common bulk phases with a preferred orientation along the closest packed planes; Fe, bcc (110) and Co, hcp (001), respectively. The uranium is present in a poorly crystalline orthorhombic, alpha-U state. In contrast, the U/Gd multilayers have sharp interfaces with negligible intermixing of atomic species, and have a roughness, which is strongly dependent on the gadolinium layer thickness. Diffraction spectra indicate a high degree of crystallinity in both U and Gd layers with intensities consistent with the growth of a novel hcp U phase, stabilised by the hcp gadolinium layers.
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