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Nano-metric self-diffusion of Fe: effect of grain size

机译：铁的纳米自扩散：晶粒尺寸的影响

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Changes in the relative 56Fe/57Fe isotope fractions due to Fe self-diffusion, that is active at the grain boundaries, can be monitored non-destructively by neutron reflectometry (NR) in the sub-nanometer length scale with atomic length scale precision. However, since grain boundary diffusion is inherently dependent upon the size of the grains and grain diameter variation perpendicular to the surface of multilayered specimens, it can often give ambiguous results in diffusivity. Here, we report on self-diffusion of Fe in bilayers, with two different thicknesses without concurrent grain growth during the annealing process. The thicknesses limit the size of the grains along the growth direction. Using NR, we find significant differences in the diffusivities as a function of annealing time in the bilayers. These results elucidate the microscopic mechanism of grain size dependent self-diffusion, which may redefine the regimes of diffusion attributed to grain boundary diffusion and volume (or lattice) diffusion.
机译：Fe自扩散引起的相对 56 Fe / 57 Fe同位素分数的变化，在可以通过中子反射法（NR）在亚纳米长度标度中以原子长度标度精度无损监控晶界。但是，由于晶界扩散固有地取决于晶粒的大小和垂直于多层试样表面的晶粒直径变化，因此它经常会在扩散率方面产生模棱两可的结果。在这里，我们报道了铁在双层中的自我扩散，具有两种不同的厚度，而在退火过程中没有同时出现晶粒长大。厚度限制了沿生长方向的晶粒尺寸。使用NR，我们发现双层中扩散率的显着差异是退火时间的函数。这些结果阐明了晶粒尺寸依赖性自扩散的微观机制，这可能会重新定义归因于晶界扩散和体积（或晶格）扩散的扩散机制。

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