####################################################
# Pete Jemian <jemian@uiuc.edu>
# requesting 6 days, at minimum=4 days
# beamline 33ID, A-USAXS study: commercial silicon nitride
# instrument 33ID-D USAXS
####################################################
# top:/home/www/beamtime-requests/req00518.txt
# UNICAT Member Beam Time Request  #518
# created Fri Dec 05 23:51:32 CST 2003
####################################################

beamline:
	33ID

collaboration:
	No

contact:
	jemian@uiuc.edu

days:
	6

description:
	Silicon nitride is an important candidate materials for high temperature applications, limited only by the material's tendency to creep.  Addition of 2nd phase rare earth oxynitrides reduces creep in silicon nitride, and in some cases eliminates creep entirely. These anomalous USAXS experiments are aimed at measuring the porous phase (creep cavities) and the secondary phase (rare earth oxynitrides) independently, as a function of deformation.

Previous experiments at UNICAT provided useful information on the creep cavities although the information content was sketchy with respect to the secondary phases. Since the performance of the beam line and instrument have improved remarkably since those experiments in 2001, we propose to repeat those measurements so as to gather the information about the secondary phase population.  The information obtained from the previous A-USAXS experiment was essential to the theoretical work of Luecke and Wiederhorn on these commercial silicon nitrides.  Several journal articles resulted from that previous effort.

equipment_required:
	

experiment:
	A-USAXS study: commercial silicon nitride

foreign_nationals:
	

hazards:
	none

instrument:
	33ID-D USAXS

instrument_other:
	

minimumdays:
	4

name:
	Pete Jemian

nonmembers:
	Gabrielle Long - APS, Xiaodong Wu - Ga Tech

unacceptable_dates:
	

z34ID_details:
	


#REMOTE_HOST: adsl-68-20-181-29.dsl.chcgil.ameritech.net
#REMOTE_ADDR: 68.20.181.29
#CONTENT_LENGTH: 1396
#HTTP_REFERER: http://www.uni.aps.anl.gov/unireq.htm
#HTTP_USER_AGENT: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007