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arXiv 1302.1708cond-mat.mtrl-scicond-mat.other
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X射线光子相关谱研究Ni-Pt固溶体中原子扩散

Studies of atomic diffusion in Ni-Pt solid solution by x-ray photon correlation spectroscopy

Markus Stana, Michael Leitner, Manuel Ross, Bogdan Sepiol

摘要:

采用原子尺度X射线光子相关谱(aXPCS)研究了Ni 97 Pt 3固溶体单晶和多晶样品中原子的扩散行为。利用实验结果和蒙特卡罗模拟讨论了不同的跳跃扩散模型。aXPCS实验的短程顺序(在这种情况下,由一个强大的Pt-Pt排斥力)的灵敏度被证明。活化能为2.93(10)eV,以及在10-23 m2 s-1的范围内的扩散系数在830 K同意非常好的示踪剂扩散研究的结果在更高的温度。

英文摘要:

Atomic scale x-ray photon correlation spectroscopy (aXPCS) was used to study atomic diffusion in the Ni97 Pt3 solid solution with both a single crystal and a polycrystalline sample. Different jump diffusion models are discussed using experimental results and Monte Carlo simulations. The sensitivity of aXPCS experiments to short-range order (in this case governed by a strong Pt-Pt repulsive force) is demonstrated. The activation energy of 2.93(10) eV as well as diffusivities in the range of 10-23 m2 s-1 at 830 K agree very well with the results of tracer diffusion studies at much higher temperatures.

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