#
# arev:/usr/local/unicat/unireq/beamreq/req00161.txt
# UNICAT Member Beam Time Request  #161

# created Wed Mar 07 08:31:48 CST 2001
#

collaboration:
	No

collaborator+Pete:
	on

contact:
	gabrielle.long@nist.gov

days:
	6

description:
	Silicon nitride is an important candidate materials for high temperature applications, limited only by the material's tendency to creep.  It has recently been found that the addition of 2nd phase rare earth oxynitrides reduce creep in silicon nitride, and in some cases eliminate 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 results of similar measurements on UNICAT Sector 33 suggest that the Luecke-Wiederhorn theory of ceramic creep may have to be adjusted to understand those data.  

equipment+required:
	USAXS instrument. Ordinary configuration.

experiment:
	Anomalous USAXS from silicon nitride

foreign+nationals:
	Frank Lofaj has done experiments at ANL, UNICAT previously.

hazards:
	No hazards.

minimumdays:
	6

name:
	Gabrielle Long

new+request:
	on

nonmembers:
	No non--UNICAT collaborators.  
	UNICAT collaborators are: Pete Jemian (UIUC) and Frank Lofaj (NIST)

station:
	33ID-D

unacceptable+dates:
	May 9 - 11, May 18 - 23, June 9 - 11, June 14 - 16, June 21 - 23.
	Preferred dates: May 29 (8 am) - June 4 (8 am) or June 29 (8 am) - July 4 (8 am).



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