Real-Time X-Ray Diffraction Measurements of the Phase Transition in KCl Shocked along [100]

Journal Article · Mon Jul 10 00:00:00 EDT 2000 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.85.330· OSTI ID:20217131

D'Almeida, T; Gupta, Y M

X-ray diffraction measurements and analyses were developed and used to examine the phase transition in KCl shocked to 7 GPa. Diffraction data were obtained below and above the transition stress, and related quantitatively to macroscopic compression in the two phases. Interplanar spacing measurements revealed isotropic compression of the unit cell. Above the transition stress, a diffraction peak from the (110) planes in phase II was observed consistently and the orientation of the transformed crystal structure was determined with respect to the phase I structure. This determination provides a mechanism for the atomic rearrangement from the rocksalt to the cesium chloride structure in KCl shocked along [100]. (c) 2000 The American Physical Society.

• OSTI ID: 20217131
• Journal Information: Physical Review Letters, Vol. 85, Issue 2; Other Information: PBD: 10 Jul 2000; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
POTASSIUM CHLORIDES
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTAL STRUCTURE
LATTICE PARAMETERS
X-RAY DIFFRACTION
SHOCK WAVES
PRESSURE DEPENDENCE
VERY HIGH PRESSURE
COMPRESSIBILITY
EXPERIMENTAL DATA