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Title: Iron bcc-hcp transition: Local structure from x-ray-absorption fine structure

Abstract

The x-ray-absorption fine-structure technique has been utilized to investigare the pressure-induced bcc-hcp transition in iron from a local structural perspective. Our measurements of the associated lattice constants show a structurally distorted hcp phase with an anomalously large c/a ratio during the transition as reported by previous x-ray-diffraction measurements. We have also observed a structurally distorted bcc phase with an anomalously large lattice constant during the transition. These anomalies are attributed to interfacial strain between the bcc and hcp phases. A transion model based on lattice shearing movements and occurrence of an intermediate fcc structure is consistent with our data and previous results.

Authors:
;
Publication Date:
Research Org.:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
3370
Report Number(s):
DOE/ER/45622-5
Journal ID: ISSN 0163-1829
DOE Contract Number:  
FG03-97ER45622
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 57; Journal Issue: 10; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BCC LATTICES; HCP LATTICES; PHASE TRANSFORMATIONS; X-RAY SPECTROSCOPY; IRON; ABSORPTION SPECTROSCOPY; FINE STRUCTURE

Citation Formats

Ingalls, R, and Wang, F M. Iron bcc-hcp transition: Local structure from x-ray-absorption fine structure. United States: N. p., 1998. Web.
Ingalls, R, & Wang, F M. Iron bcc-hcp transition: Local structure from x-ray-absorption fine structure. United States.
Ingalls, R, and Wang, F M. Sun . "Iron bcc-hcp transition: Local structure from x-ray-absorption fine structure". United States.
@article{osti_3370,
title = {Iron bcc-hcp transition: Local structure from x-ray-absorption fine structure},
author = {Ingalls, R and Wang, F M},
abstractNote = {The x-ray-absorption fine-structure technique has been utilized to investigare the pressure-induced bcc-hcp transition in iron from a local structural perspective. Our measurements of the associated lattice constants show a structurally distorted hcp phase with an anomalously large c/a ratio during the transition as reported by previous x-ray-diffraction measurements. We have also observed a structurally distorted bcc phase with an anomalously large lattice constant during the transition. These anomalies are attributed to interfacial strain between the bcc and hcp phases. A transion model based on lattice shearing movements and occurrence of an intermediate fcc structure is consistent with our data and previous results.},
doi = {},
journal = {Physical Review, B: Condensed Matter},
issn = {0163-1829},
number = 10,
volume = 57,
place = {United States},
year = {1998},
month = {3}
}