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小木蟲(金幣+0.5):給個紅包，謝謝回帖
真有意思，這個文章第一單位是浙江大學，為啥說是美國制造出來的？
Long-Range Topological Order in Metallic Glass
Qiaoshi Zeng1,2,
Hongwei Sheng3,
Yang Ding2,
Lin Wang2,4,
Wenge Yang2,
Jian-Zhong Jiang1,*,
Wendy L. Mao1,5,6,
Ho-Kwang Mao1,2,7,*
- Author Affiliations
1International Center for New-Structured Materials, Zhejiang University and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China.
2HPSynC (High Pressure Synergetic Consortium), Geophysical Laboratory, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, IL 60439, USA.
3School of Physics, Astronomy, and Computational Sciences, George Mason University, Fairfax, VA 22030, USA.
4State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People’s Republic of China.
5Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA.
6Photon Science and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
7Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA.
*To whom correspondence should be addressed. E-mail: mao@gl.ciw.edu (H.-K.M.); jiangjz@zju.edu.cn (J.-Z.J.)
Abstract
Glass lacks the long-range periodic order that characterizes a crystal. In the Ce75Al25 metallic glass (MG), however, we discovered a long-range topological order corresponding to a single crystal of indefinite length. Structural examinations confirm that the MG is truly amorphous, isotropic, and unstrained, yet under 25 gigapascals hydrostatic pressures, every segment of a centimeter-length MG ribbon devitrifies independently into a face-centered cubic (fcc) crystal with the identical orientation. By using molecular dynamics simulations and synchrotron x-ray techniques, we elucidate that the mismatch between the large Ce and small Al atoms frustrates the crystallization and causes amorphization, but a long-range fcc topological order still exists. Pressure induces electronic transition in Ce, which eliminates the mismatch and manifests the topological order by the formation of a single crystal. |
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