English
 
Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
Add to Basket
 Local TagsRelease HistoryDetailsSummary
  High-pressure phase transition in silicon carbide under shock loading using ultrafast x-ray diffraction

Tracy, S. J., Smith, R. F., Wicks, J. K., Fratanduono, D. E., Gleason, A. E., Bolme, C., Speziale, S., Appel, K., Prakapenka, V. B., Fernandez Panella, A., Lee, H. J., MacKinnon, A., Eggert, J., Duffy, T. S. (2017): High-pressure phase transition in silicon carbide under shock loading using ultrafast x-ray diffraction - Abstracts, AGU 2017 Fall Meeting (New Orleans, USA 2017).

Item is

 

show all hide all

Basic

show hide
Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_3305900 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_3305900_3
Genre: Conference Paper

Files

show Files

Locators

show
hide
Locator:
https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/254822 (Supplementary material)
Description:
-

Creators

show
hide
 Creators:
Tracy, Sally June1, Author
Smith, Ray F.1, Author
Wicks, June K.1, Author
Fratanduono, Dayne E.1, Author
Gleason, Arianna E.1, Author
Bolme, Cynthia1, Author
Speziale, S.2, Author              
Appel, Karen1, Author
Prakapenka, Vitali B.1, Author
Fernandez Panella, Amalia1, Author
Lee , Hae Ja1, Author
MacKinnon, Andy1, Author
Eggert, Jon1, Author
Duffy, Thomas S.1, Author
Affiliations:
1External Organizations, ou_persistent22              
24.3 Chemistry and Physics of Earth Materials, 4.0 Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146036              

Content

show
hide
Free keywords: -
 Abstract: The behavior of silicon carbide (SiC) under shock loading was investigated through a series of time-resolved pump-probe x-ray diffraction (XRD) measurements. SiC is found at impact sites and has been put forward as a possible constituent in the proposed class of extra-solar planets known as carbon planets. Previous studies have used wave profile measurements to identify a phase transition under shock loading near 1 Mbar, but crystal structure information was not obtained. We have carried out an in situ XRD study of shock-compressed SiC using the Matter in Extreme Conditions instrument of the Linac Coherent Light Source. The femtosecond time resolution of the x-ray free electron laser allows for the determination of time-dependent atomic arrangements during shock loading and release. Two high-powered lasers were used to generate ablation-driven compression waves in the samples. Time scans were performed using the same drive conditions and nominally identical targets. For each shot in a scan, XRD data was collected at a different probe time after the shock had entered the SiC. Probe times extended up to 40 ns after release. Scans were carried out for peak pressures of 120 and 185 GPa. Our results demonstrate that SiC transforms directly from the ambient tetrahedrally-coordinated phase to the octahedral B1 structure on the nanosecond timescale of laser-drive experiments and reverts to the tetrahedrally coordinated ambient phase within nanoseconds of release. The data collected at 120 GPa exhibit diffraction peaks from both compressed ambient phase and transformed B1 phase, while the data at 185 GPa show a complete transformation to the B1 phase. Densities determined from XRD peaks are in agreement with an extrapolation of previous continuum data as well as theoretical predictions. Additionally, a high degree of texture was retained in both the high-pressure phase as well as on back transformation. Two-dimensional fits to the XRD data reveal details of the orientational relationships between the low- and high-pressure phases that can be interpreted to provide information about transformation pathways between tetrahedral and octahedral coordination structures.

Details

show
hide
Language(s): eng - English
 Dates: 2017
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: GFZPOF: p3 PT2 Plate Boundary Systems
GFZPOF: p3 PT5 Georesources
 Degree: -

Event

show
hide
Title: AGU 2017 Fall Meeting
Place of Event: New Orleans, USA
Start-/End Date: 2017-12-11 - 2017-12-15

Legal Case

show

Project information

show

Source 1

show
hide
Title: Abstracts
Source Genre: Proceedings
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -