Li Liangliang, Luo Qiang, Li Renfeng, Zhao Haiyan, Chapman Karena W, Chupas Peter J, Wang Luhong, Liu Haozhe
Harbin Institute of Technology, Harbin 150080, China.
Center for High Pressure Science and Technology Advanced Research, Changchun 130015, China.
Sci Rep. 2017 Apr 25;7:46762. doi: 10.1038/srep46762.
The YbZnMgCu metallic glass is investigated using synchrotron x-ray total scattering method up to 38.4 GPa. The polyamorphic transformation from low density to high density with a transition region between 14.1 and 25.2 GPa is observed, accompanying with a volume collapse reflected by a discontinuousness of isothermal bulk modulus. This collapse is caused by that distortional icosahedron short range order precedes to perfect icosahedron, which might link to Yb 4f electron delocalization upon compression, and match the result of in situ electrical resistance measurement under high pressure conditions. This discovery in Yb-based metallic glass, combined with the previous reports on other metallic glass systems, demonstrates that pressure induced polyamorphism is the general behavior for typical lanthanide based metallic glasses.
采用同步辐射X射线全散射方法，在高达38.4 GPa的压力下对YbZnMgCu金属玻璃进行了研究。观察到在14.1至25.2 GPa之间存在一个过渡区域，发生了从低密度到高密度的多晶型转变，同时伴随着等温体积模量的不连续性所反映的体积塌缩。这种塌缩是由于扭曲的二十面体短程有序先于完美的二十面体出现，这可能与压缩时Yb 4f电子的离域有关，并且与高压条件下的原位电阻测量结果相符。在基于Yb的金属玻璃中的这一发现，结合先前关于其他金属玻璃体系的报道，表明压力诱导的多晶型转变是典型的基于镧系元素的金属玻璃的普遍行为。
