Journal Article

PUBDB-2015-01817

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In situ x-ray diffraction of fast compressed iron: Analysis of strains and stress under non-hydrostatic pressure

Konôpková, Z. (Corresponding Author)>Extern* ; Rothkirch, A.DESY* ; Singh, A.>Extern* ; Speziale, S.>Extern* ; Liermann, H.-P.DESY*

2015
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevB.91.144101

Abstract: Series of high-pressure x-ray diffraction patterns of iron and its high-pressure polymorphs were collected with0.1–0.2-s exposure time utilizing a membrane diamond anvil cell (DAC) for compression at various loading andunloading rates to a maximum pressure of 70 GPa. Strain rates of 10−2s−1at a maximum pressurization rateof 4.1 GPa/s were achieved in non-hydrostatic compression of hcp Fe. Linewidth analysis was used to retrievestrain and uniaxial stress of Fe as a function of pressure upon both compression and decompression. Analysis ofthe lattice parameters ratio c/a of hcp Fe indicates the presence of complex non-hydrostatic stress states, whichdeveloped as a function of strain rate, relaxation time, and various levels of hydrostaticity. Our results emphasizethe importance of a controlled pressurization in DACs because the experimental loading rate strongly influencesthe stress state of the sample, particularly on decompression. Our time-resolved x-ray diffraction of the phasetransition from bcc Fe to hcp Fe reveals residual grains of bcc Fe capable of surviving to very high pressures(> 35 GPa) for a few minutes after the transition.

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Contributing Institute(s):

1. Experimentebetreuung PETRA III (FS-PE)
2. DOOR-User (DOOR)
3. FS-Experiment Control (FS-EC)

Research Program(s):

1. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
2. 6G3 - PETRA III (POF3-622) (POF3-622)

Experiment(s):

1. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2015

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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