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Interactions and phase transformations in Fe-Pd

机译:Fe-Pd中的相互作用和相变

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Interactions in Fe-Pd were studied using diffuse x-ray scattering and first-principles calculations. Diffuse x-ray scattering was performed from single crystals of Fe-38.2 at. % Pd and Fe-81.0 at. % Pd to investigate states of thermal equilibrium at 1023 K and 1073 K, respectively. Short-range-order scattering was separated and effective pair interaction (EPI) parameters were determined using the inverse Monte Carlo method. The EPI parameters are found to strongly vary with respect to data from a previous investigation of Fe-50 at. % Pd. Electronic-structure calculations of effective cluster interaction (ECI) parameters for these states showed the importance of considering multibody interactions and applying the disordered local moment model of the magnetic state: in the ferromagnetic model, the strength of the interactions gets overestimated. Close agreement is reached for short-range order between calculations and the present scattering experiments. Using either a linear compositional variation of the EPI parameters or ECI parameters for alloys with other Pd fractions, the shape of the order-disorder transition line on the Pd-rich side could be reproduced.
机译:使用扩散X射​​线散射和第一性原理计算研究了Fe-Pd中的相互作用。从Fe-38.2 at单晶进行扩散X射线散射。钯和铁含量为81.0 at。 Pd百分比,以分别研究1023 K和1073 K时的热平衡状态。短程散射被分离,并使用反向蒙特卡洛方法确定有效的对相互作用(EPI)参数。发现EPI参数相对于先前对Fe-50at的研究的数据有很大的不同。钯含量对于这些状态的有效簇相互作用(ECI)参数的电子结构计算表明,考虑多体相互作用并应用磁态的无序局部矩模型非常重要:在铁磁模型中,相互作用的强度被高估了。计算和当前的散射实验之间的近距离顺序达成了密切的共识。使用具有其他Pd分数的合金的EPI参数或ECI参数的线性组成变化,可以再现富Pd侧的有序-无序过渡线的形状。

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