Modelling the X-ray powder diffraction of nitrogen-expanded austenite using the Debye formula

Jette Oddershede, Thomas Christiansen, Kenny Ståhl

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Stress-free and homogeneous samples of nitrogen-expanded austenite, a defect-rich f.c.c. structure with a high interstitial nitrogen occupancy (between 0.36 and 0.61), have been studied using X-ray powder diffraction and Debye simulations. The simulations confirm the presence of deformation stacking faults in the structure, while twin or growth faulting can be ruled out. Screw dislocations are abundant and the dislocation density increases with the interstitial nitrogen occupancy. Whether the N atoms are clustered or distributed randomly among the octahedral interstices was found to be indistinguishable to X-ray powder diffraction.
Original languageEnglish
JournalJournal of Applied Crystallography
Volume41
Issue number3
Pages (from-to)537-543
ISSN0021-8898
DOIs
Publication statusPublished - 2008

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