Abstract:
:Under rapid high-temperature, high-pressure loading, lattices exhibit complex elastic-inelastic responses. The dynamics of these responses are challenging to measure experimentally because of high sample density and extremely small relevant spatial and temporal scales. Here, we use an x-ray free-electron laser providing simultaneous in situ direct imaging and x-ray diffraction to spatially resolve lattice dynamics of silicon under high-strain rate conditions. We present the first imaging of a new intermediate elastic feature modulating compression along the axis of applied stress, and we identify the structure, compression, and density behind each observed wave. The ultrafast probe x-rays enabled time-resolved characterization of the intermediate elastic feature, which is leveraged to constrain kinetic inhibition of the phase transformation between 2 and 4 ns. These results not only address long-standing questions about the response of silicon under extreme environments but also demonstrate the potential for ultrafast direct measurements to illuminate new lattice dynamics.
journal_name
Sci Advjournal_title
Science advancesauthors
Brown SB,Gleason AE,Galtier E,Higginbotham A,Arnold B,Fry A,Granados E,Hashim A,Schroer CG,Schropp A,Seiboth F,Tavella F,Xing Z,Mao W,Lee HJ,Nagler Bdoi
10.1126/sciadv.aau8044subject
Has Abstractpub_date
2019-03-08 00:00:00pages
eaau8044issue
3issn
2375-2548pii
aau8044journal_volume
5pub_type
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