Experimental evidence for the role of supersaturated interfacial alloys on the shear elastic softening of Ni/Mo superlattices
Experimental evidence for the role of supersaturated interfacial alloys on the shear elastic softening of Ni/Mo superlattices
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DOI：
10.1103/physrevb.65.212105
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发表时间：
2002-05
影响因子：
3.7
通讯作者：
G. Abadias;C. Jaouen;F. Martin;J. Pacaud;P. Djemia;F. Ganot
中科院分区：
文献类型：
--
作者：
G. Abadias;C. Jaouen;F. Martin;J. Pacaud;P. Djemia;F. Ganot
界面在纳米尺度金属超晶格弹性行为中的重要性早已被认识到，尽管它们的内在本质和潜在的物理机制仍然存在争议。在本研究中，界面合金化效应的显着软化（-62%）的剪切弹性常数C44的Ni/Mo多层膜的关键作用是清楚地证明。通过结合X射线衍射和布里渊光散射实验的Ni/Mo超晶格和Ni 1 - x Mo x固溶体样品，我们表明，形成的亚稳合金，通过共溅射或稳定在界面上，诱导弹性晶格不稳定性。此外，观察到的多层膜，在小的调制周期的C 4 4的值非常低，这表明在外延生长的高度过饱和的界面合金层的稳定。
The importance of the interfaces in governing the elastic behavior of nanometer-scale metallic superlattices has long been recognized, although their intrinsic nature and the underlying physical mechanisms are still subject to controversy. In the present study, the key role of an interfacial alloying effect on the dramatic softening (-62%) in the shear elastic constant C 4 4 of Ni/Mo multilayers is clearly evidenced. By combining x-ray diffraction and Brillouin light scattering experiments on both Ni/Mo superlattices and Ni 1 - x Mo x solid solution samples, we show that the formation of metastable alloys, obtained either by cosputtering or stabilized at the interfaces, induces an elastic lattice instability. In addition, the extremely low value of C 4 4 observed for the multilayers, at small modulation periods, suggests the stabilization under epitaxial growth of a highly supersaturated interfacial alloyed layer.