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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Structural changes to epitaxial (0001) holmium layers during hydrogen loading
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Structural changes to epitaxial (0001) holmium layers during hydrogen loading

机译：氢气加载过程中外延（0001）layers层的结构变化

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HoHy exhibits dramatic changes in both structural and optical properties as y is varied from zero to three by hydrogen loading. This work reports on the effect of such loading upon epitaxial single-crystal Ho films grown by molecular beam epitaxy on (110) Nb parallel to(11(2) over bar 0) Al2O3 substrates. Upon loading, the film undergoes a structural transition from hcp metal (alpha-phase, H in solid solution) to the fee dihydride (beta-phase). There is a further transformation between the dihydride phase and the hexagonal trihydride (gamma-phase). Three films of HoHy, where, nominally, y = 0, 2, 3, were studied by XRD, AFM, UFM, SEM and TEM. Triangular networks of features of width similar to 300 nm and height similar to 20-30 nm that align with the [0(1) over bar 1], [(1) over bar 01] and [1(1) over bar 0] directions of the dihydride sample are seen on the surface of both the dihydride and the trihydride samples, but have a much greater density on the surface of the latter Such features are not present on the as-grown metal layer. In situ controlled-environment transmission electron microscopy (CETEM) studied the effects of hydrogen loading within the dihydride phase, in cross sectional geometry. During loading, slip within the dihydride phase was observed. The hypothesis that the triangular features are due to the precipitation of the di- and trihydride compounds, with expanded lattices, on the slip planes within the alpha- or beta-phase host crystal is discussed. [References: 21]
机译：由于氢负载使y从0变为3，HoHy在结构和光学性质上均表现出巨大变化。这项工作报告了这种负载对分子束外延在平行于（0）Al2O3衬底上的（11（2））的（110）Nb上通过分子束外延生长的外延单晶Ho膜的影响。加载后，薄膜经历了从hcp金属（α相，H在固溶体中）到二氢化物（β相）的结构转变。在二氢化物相和六方三氢化物（γ相）之间还有一个进一步的转变。通过XRD，AFM，UFM，SEM和TEM研究了三片HoHy薄膜，其中名义上的y = 0、2、3。宽度类似于300 nm，高度类似于20-30 nm的三角形网络，它们与[bar 1上方的0（1），bar 01上方的[1]和bar 0上方的[1（1）]对齐在二氢化物和三氢化物样品的表面上都可以看到二氢化物样品的方向，但是在后者的表面上具有更大的密度。这样的特征在刚生长的金属层上不存在。原位控制环境透射电子显微镜（CETEM）在横截面几何形状中研究了氢在二氢化物相中负载的影响。在加载期间，观察到二氢化物相内的滑移。讨论了三角形特征是由于二氢化物和三氢化物化合物具有扩展的晶格在α相或β相基质晶体内的滑移面上析出的假设。 [参考：21]

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