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# Brent Heuser <bheuser@uiuc.edu>
# requesting 7 days, at minimum=7 days
# beamline 33BM, "High resolution diffraction investigation of hydride phase transformations in epitaxial Nb"
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# top:/home/www/beamtime-requests/req00387.txt
# UNICAT Member Beam Time Request  #387
# created Mon Mar 17 10:25:02 CST 2003
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beamline:
	33BM

collaboration:
	Yes

collaborator+Jenia:
	on

contact:
	bheuser@uiuc.edu

days:
	7

description:
	We are interested in tracking the structural changes induced by hydrogen loading and unloading in epitaxial Nb thin films.  The purpose of the proposed experiments is to understand the consequences of restricted geometry on the hydrogen-Nb miscibility behavior.  XRD allows us to determine the correlation between the phase transformations within the gap and the loss of film coherency.  We have completely characterized a thick film (1200 A) and now need to characterize a thin (250 A) film.  These two film thickness are greater than and less than the critical film thickness for mismatch dislocation generation during film growth.  A comparison of these two film thicknesses will allow us to understand the effect of coherency loss during film growth on the phase behavior.

equipment+required:
	turbo pump station

experiment:
	High resolution diffraction investigation of hydride phase transformations in epitaxial Nb

foreign+nationals:
	

hazards:
	We are using hydrogen gas in static, non-flowing conditions.  We have an approved SoP for our gas handling procedures.

minimumdays:
	7

name:
	Brent Heuser

nonmembers:
	

unacceptable+dates:
	April 12th to 22nd, 2003
	Maybe others, but do not yet know (BJH has jury duty in May)


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