Time-resolved x-ray diffraction across water-ice-VI/VII transformations using the dynamic-DAC

18th APS-SCCM; 24th AIRAPT

Chen, Jing-Yin^1 ; Kim, Minseob^2 ; Yoo, Choong-Shik^2 ; Liermann, Hanns-Peter^3 ; Evans, William J.^1

CMMD, Physical and Life Science Direct., Lawrence Livermore National Laboratory, Livermore

CA

94551, United States^1

Institute for Shock Physics, Department of Chemistry, Washington State University, Pullman

WA

99164, United States^2

Photon Sciences, Deutsches-Elektronen Synchrotron DESY, Hamburg

D-22603, Germany^3

关键词: Anisotropic compression;    Compression rates;    Dynamic loadings;    Sharp transition;    Static conditions;    Structural evolution;    Structural response;    Time resolved x-ray diffractions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/14/142006/pdf
DOI  :  10.1088/1742-6596/500/14/142006

来源: IOP

【 摘 要 】

We present recent time-resolved x-ray diffraction data obtained across the solidification of water to ice-VI and -VII at different compression rates. The structural evolution of ice-VI to ice-VII, however, is not a sharp transition, but occurs rather coarsely. The diffraction data shows an anisotropic compression behavior for ice VI; that is, the c-axis is more compressible than the a-axis at the same compression rate. Nevertheless, the present equations of state of both ice-VI and ice-VII obtained under dynamic loadings agree well with those previously obtained under static conditions. Hence, the present study demonstrates that time-resolved x-ray diffraction coupled with the dynamic-DAC is an effective method for investigating details of the structural response of materials over a wide range of well-controlled compression rates. Finally, we found the evidence for an X-ray induced chemical reaction of water and ice-VI. The impurities, produced by the x-ray induced chemical reaction, inhibit the formation of amorphous ice.