Hierarchical densification and negative thermal expansion in Ce-based metallic glass under high pressure

Qiang Luo, Gaston Garbarino, Baoan Sun, Dawei Fan, Yue Zhang, Zhi Wang, Yajuan Sun, Jin Jiao, Xiaodong Li, Pengshan Li, Norbert Mattern, Jürgen Eckert and Jun Shen ()
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Qiang Luo: School of Materials Science and Engineering, Tongji University
Gaston Garbarino: European Synchrotron Radiation Facility (ESRF)
Baoan Sun: IFW Dresden, Institute for Complex Materials
Dawei Fan: Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences
Yue Zhang: Ames Laboratory-USDOE, Iowa State University
Zhi Wang: IFW Dresden, Institute for Complex Materials
Yajuan Sun: School of Materials Science and Engineering, Tongji University
Jin Jiao: School of Materials Science and Engineering, Tongji University
Xiaodong Li: Institute of High Energy Physics, Chinese Academy of Sciences
Pengshan Li: Institute of High Energy Physics, Chinese Academy of Sciences
Norbert Mattern: IFW Dresden, Institute for Complex Materials
Jürgen Eckert: IFW Dresden, Institute for Complex Materials
Jun Shen: School of Materials Science and Engineering, Tongji University

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract The polyamorphsim in amorphous materials is one of the most fascinating topics in condensed matter physics. In amorphous metals, the nature of polyamorphic transformation is poorly understood. Here we investigate the structural evolution of a Ce-based metallic glass (MG) with pressure at room temperature (RT) and near the glass transition temperature by synchrotron X-ray diffraction, uncovering novel behaviours. The MG shows hierarchical densification processes at both temperatures, arising from the hierarchy of interatomic interactions. In contrast with a continuous and smooth process for the low- to medium-density amorphous state transformation at RT, a relatively abrupt and discontinuous transformation around 5.5 GPa is observed at 390 K, suggesting a possible weak first-order nature. Furthermore, both positive and abnormal-negative thermal expansion behaviours on medium-range order are observed in different pressure windows, which could be related to the low-energy vibrational motions and relaxation of the weakly linked solute-centred clusters.

Date: 2015
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DOI: 10.1038/ncomms6703

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