Non-thermal structural transformation of diamond driven by x-rays.
Struct Dyn
; 10(5): 054502, 2023 Sep.
Article
em En
| MEDLINE
| ID: mdl-37901681
Intense x-ray pulses can cause the non-thermal structural transformation of diamond. At the SACLA XFEL facility, pump x-ray pulses triggered this phase transition, and probe x-ray pulses produced diffraction patterns. Time delays were observed from 0 to 250 fs, and the x-ray dose varied from 0.9 to 8.0 eV/atom. The intensity of the (111), (220), and (311) diffraction peaks decreased with time, indicating a disordering of the crystal lattice. From a Debye-Waller analysis, the rms atomic displacements perpendicular to the (111) planes were observed to be significantly larger than those perpendicular to the (220) or (311) planes. At a long time delay of 33 ms, graphite (002) diffraction indicates that graphitization did occur above a threshold dose of 1.2 eV/atom. These experimental results are in qualitative agreement with XTANT+ simulations using a hybrid model based on density-functional tight-binding molecular dynamics.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Struct Dyn
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
Estados Unidos