####################################################
# Waltraud Kriven <kriven@uiuc.edu>
# requesting 7 days, at minimum=6 days
# beamline 33BM, "In-situ high temperature phase transformations in dysprosium titanate"
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# top:/home/www/beamtime-requests/req00461.txt
# UNICAT Member Beam Time Request  #461
# created Sun Aug 24 15:31:24 CDT 2003
####################################################

beamline:
	33BM

collaboration:
	No

collaborator_Paul:
	ON

contact:
	kriven@uiuc.edu

days:
	7

description:
	We propose to study phase transformations in rare earth oxides such as niobates and titanates. These materials are interesting to study not only as examples for new high temperature phase transformations but they also have potential applications as toughening materials or for large force actuators or shape memory behavior. Previous experiments on niobates have revealed a phase transformation at high temperatures (~1900C) that is accompanied by a chemical decomposition, further studies are necessary to clarify the nature of this high temperature phase. Due to the extended time frames for conventional experiments the samples disintegrated before accurate data could be taken in previous experiments.  It would therefore be beneficial to use the image plate technique to capture the emerging high temperature phase and get data of sufficiently high quality for structural refinements.
Rare earth titanates (here dysprosium titanate) on the other hand show a number of phase transformations (cubic to orthorhombic to hexagonal to cubic) where little or no accurate structural information is available. The proposed study is a continuation of previous experiments where data has been taken for the hexagonal and orthorhombic phases in the temperature range of 400 to 1300 C. however, additional high and low temperature cubic phases have been detected previously that need further study to clarify their structure. It would be of special interest to determine whether the low temperature and high temperature cubic phase show the same structure. These data would be beneficial to identify the nature of the symmetry changes in the course of the phase transformation and it is expected to yield valuable information for the design of novel materials for high temperature applications.

equipment_required:
	Water chiller

experiment:
	In-situ high temperature phase transformations in dysprosium titanate

foreign_nationals:
	Waltraud Kriven (Australian)
Kerstin Jurkschat (German)
Pankaj Sarin (Indian)

hazards:
	None

minimumdays:
	6

name:
	Waltraud Kriven

nonmembers:
	None

unacceptable_dates:
	9/8 - 9/11
10/3 - 10/5
11/6 - 11/11

z34ID_details:
	


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