#
# top.uni.aps.anl.gov:/home/www/beamtime-requests/req00189.txt
# UNICAT Member Beam Time Request  #189

# created Tue Jun 05 13:04:57 CDT 2001
#
collaboration:
	No

collaborator+Paul:
	on

contact:
	SMoss@uh.edu

days:
	6

description:
	The (martensitic) structural transition from the metastable fcc state
	to the hcp phase in an epitaxial Co(001) layer will be examined by
	means of diffuse x-ray scattering.
	The sample will be cleaned in UHV by moderate sputtering and then 
	successively annealed to 350, 400 and 450 centigrades. The diffuse
	scattering in a plane parallel to the sample surface will be recorded
	with linescans using a scintillation counter after each annealing step.
	It is expected that precursors of the phase transition will show up
	as diffuse scattering indicative of the transformation mechanism.
	The transformation path from the fcc to the hcp state is expected to
	differ from that in bulk Cobalt due to an epitaxial clamping effect.
	The results should be generally valid for the class of thin films
	exhibiting martensitic transitions.

equipment+required:
	UHV chamber in Station E, sputter gun, heater

experiment:
	Structural Transitions in Epitaxial Co layers

foreign+nationals:
	Dr. Wolfgang Donner, University of Houston. (german citizen)
	has valid batch No. B 088183 A

hazards:
	Sample is 50 nm Co layer on 10 nm Cu on a 5x5mm^2 SrTiO3 crystal.
	The sample is harmless and no hazarduous materials will be used.

minimumdays:
	4

name:
	S.C. Moss

nonmembers:
	

station:
	33ID-E

unacceptable+dates:
	none


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