####################################################
# Brent J. Heuser <bheuser@uiuc.edu>
# requesting 7 days, at minimum=5 days
# beamline 33BM, "High resolution XRD measurements of hydride phase transformations in epitaxial Nb"
####################################################
# top:/home/www/beamtime-requests/req00320.txt
# UNICAT Member Beam Time Request  #320
# created Mon Dec 09 12:40:47 CST 2002
####################################################

beamline:
	33BM

collaboration:
	No

collaborator+Paul:
	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 (thin Nb films on a non-absorbing substrate) on the hydrogen-Nb miscibility gap.  XRD allows us to determine the correlation between the phase transformations within the miscibility gap and the loss of film coherency via dislocation generation.  We indirectly observe dislocation formation by an increase in film mosaic and the reduction of the "narrow" component of the rocking curve associated with perfect film registry of the film to the substrate.

equipment+required:
	Turbo station (two turbo stations if possible)

experiment:
	High resolution XRD measurements of hydride phase transformations in epitaxial Nb

foreign+nationals:
	

hazards:
	We are using hydrogen gas in a static, non-flowing configuration.  The gas bottle is stored outside of the hutch.  We have a SOP on file for these experiments.

minimumdays:
	5

name:
	Brent J. Heuser

nonmembers:
	

unacceptable+dates:
	Jan 1, 2003 to Feb 16, 2002
	April 10, 2003 to April 22, 2003


#REMOTE_HOST: ne54.ne.uiuc.edu
#REMOTE_ADDR: 128.174.163.54
#CONTENT_LENGTH: 1269
#HTTP_REFERER: http://www.uni.aps.anl.gov/unireq.htm
#HTTP_USER_AGENT: Mozilla/4.0 (compatible; MSIE 5.12; Mac_PowerPC)