Direct Observations of a Dynamically Driven Phase Transition with in situ X-Ray Diffraction in a Simple Ionic Crystal

Authors

P Kalita, Sandia National LaboratoriesFollow
P Specht, Sandia National Laboratories
S Root, Sandia National Laboratories
N Sinclair, Washington State University
A Schuman, Washington State University
M White, University of Nevada, Las VegasFollow
A L. Cornelius, University of Nevada, Las VegasFollow
J Smith, Carnegie Institution of WashingtonFollow
S Sinogeikin, Carnegie Institution of WashingtonFollow

Document Type

Article

Publication Date

1-1-2017

Publication Title

Physical Review Letters

Volume

119

Issue

25

Abstract

We report real-time observations of a phase transition in the ionic solid CaF2, a model AB2 structure in high-pressure physics. Synchrotron x-ray diffraction coupled with dynamic loading to 27.7 GPa, and separately with static compression, follows, in situ, the fluorite to cotunnite structural phase transition, both on nanosecond and on minute time scales. Using Rietveld refinement techniques, we examine the kinetics and hysteresis of the transition. Our results give insight into the kinetic time scale of the fluorite-cotunnite phase transition under shock compression, which is relevant to a number of isomorphic compounds. © 2017 American Physical Society.

Language

english

Repository Citation

Kalita, P., Specht, P., Root, S., Sinclair, N., Schuman, A., White, M., Cornelius, A. L., Smith, J., Sinogeikin, S. (2017). Direct Observations of a Dynamically Driven Phase Transition with in situ X-Ray Diffraction in a Simple Ionic Crystal. Physical Review Letters, 119(25),
http://dx.doi.org/10.1103/PhysRevLett.119.255701