#
# arev:/usr/local/unicat/unireq/beamreq/req00114.txt
# UNICAT Member Beam Time Request  #114

# created Sat Apr 01 13:22:38 CST 2000
#

collaboration:
	No

collaborator+Paul:
	on

days:
	7-10

description:
	This is a beamtime request for a collaborative research invloving Prof.
	W.M. Kriven of University of Illinois at Urbana-Champaign and 
	Dr. Julius Schneider of University of Munchen, Germany.
	
	
	A new quadrupole lamp furnace has been designed for the Huber Eularian 
	cradle in the UNICAT hutch. It is anticipated to be capable of heating 
	a localized cylindrical volume of approximate dimensions 4 mm in 
	diameter by 7 mm in length, to a temperature of 2000%B0C in air. The 
	furnace has been constructed and will be set up by Mr. Maennl.  He and
	 Dr. Schneider of the Ludwig Maximilian University in Munich, Germany, 
	will come to the ANL, and in collaboration with Professor Trudy Kriven 
	at UIUC, will calibrate and test the furnace. Initially an alumina rod 
	specimen of minimum dimensions 0.5 mm x 20mm in length will be used. 
	The thermal expansion coefficients of alumina are well documented and 
	so provide a good starting point. The temperature will then be 
	calibrated by samples of di-lanthanide aluminates (2Ln2O3oAl2O3), 
	notably the yttrium and dysprosium aluminates, whose transformation 
	temperatures and crystallographic parameters have been independently 
	determined by high temperature dilatometry and (in the case of yttrium),
	 by high temperature neutron diffraction. Other lanthanide aluminates 
	will be used as needed to fill in the temperature gaps. The specimens 
	will be fabricated in the MATSE Dept. at UIUC. An unknown sample of 
	dysprosium titanate (Dy2TiO5) will then be examined up to 1850%B0C to 
	determine its axial crystallographic thermal expansion coefficients, 
	transformation temperature, unit cell volume change at transformation, 
	and hysteresis temperatures, if any. The crystallographic data is 
	analyzed by the Rietveld technique. This information is vital in order 
	to use the transformation to toughen oxide ceramic composites for 
	airplane combustion engine liners to enable them to operate up to 
	1600%B0C in an oxidizing atmosphere. Similar work has been done on the 
	mullite (3Al2O3o2SiO2) system recently, However, the high temperature 
	neutron facility at Grenoble in France was then used.  The work was 
	recently published in J. European Ceramic Society.
	
	[Ref: "High Temperature Single Crystal Properties of Mullite" 
	W. M. Kriven, J. Palko, S. Sinogeikin, Jay D. Bass, A. Sayir, 
	G. Brunauer, H. Boysen, F. Frey and J. Schneider, J. Europ. 
	Ceram. Soc., 19 [13] 2529-2541 (1999)].
	

equipment+required:
	Huber 6 Circle Diffractometer

experiment:
	High Temperature Phase Transformations in Oxide Ceramics

hazards:
	No harzards.

name:
	Haydn Chen

new+request:
	on

nonmembers:
	Prof. W.M. Kriven, Department of Materials Science %26 Engineering,
	University of Illinois, 1304 West Green Street, Urbana,IL 61801
	<w-kriven@staff.uiuc.edu>
	
	Dr. Julius Schneider
	Universit%E4t M%FCnchen
	Institut f%FCr Kristallographie
	Theresienstra%DFe 41
	Bayern;80333 M%FCnchen
	Germany
	<julius.schneider@lrz.uni-muenchen.de>

station:
	33ID-D

unacceptable+dates:
	April 30th to May 3rd
	May 20th -27th
	May 19th %9624th
	May 28th %96June 2nd
	June 22nd %9630th
	
	Desirable Dates:
	1st choice: June 7th %9617th pending answer from Julius Schneider
	2nd choice June29th %96 7th pending answer from Julius Schneider
	



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