Dynamic compression of [100] MgF2 single crystals: Shock-induced polymorphism to highly coordinated structures

Ocampo, I. K.; Winey, J. M.; Toyoda, Y.; Duffy, T. S.

doi:10.1103/physrevb.106.144108

Dynamic compression of [100] MgF₂ single crystals: Shock-induced polymorphism to highly coordinated structures

Journal Article · Tue Oct 25 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.144108· OSTI ID:1899360

^[1]; ^[2]; Toyoda, Y. ^[2]; Duffy, T. S. ^[3]

Princeton Univ., NJ (United States); Institute for Shock Physics, Washington State University
Washington State Univ., Pullman, WA (United States)
Princeton Univ., NJ (United States)

AX₂-type compounds exhibit a rich and complex series of phase transitions under compression. The high-pressure polymorphism of rutile-type AX₂ difluorides can be characterized by a typical sequence from rutile type → Ca Cl₂ type → HP – Pd F₂ type → cotunnite type . Relative to dioxides, the reduced valence and ionic radius of the F^– anion in rutile-type MgF₂ (sellaite) results in lowered transition pressures, making it a useful analog for SiO₂ and other dioxides. In this work, MgF₂ single crystals were shock-compressed along the [100] direction to 24 to 120 GPa using plate impact techniques, and wave profiles were measured using laser interferometry. At low stresses (24 to 44 GPa), we observe features consistent with an elastic–inelastic response, followed by a phase transformation. Peak stress-density states in this stress range are consistent with those expected for the modified fluorite-type (HP- PdF₂) phase or a related structure. At higher stresses (69 to 91 GPa), we observe a two-wave structure with peak stress-density states consistent with transformation to a denser and likely more highly coordinated phase such as the cotunnite-type structure. Furthermore, at 120 GPa, only a single wave structure is observed, indicating that the wave profile features observed at lower stresses are overdriven.

View Accepted Manuscript (DOE)

Research Organization:: Washington State Univ., Pullman, WA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

Grant/Contract Number:: NA0003957

OSTI ID:: 1899360

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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