####################################################
# Waltraud M. Kriven <kriven@uiuc.edu>
# requesting 4 days, at minimum=3 days
# beamline 33BM, "Evaluation of a 2-D detector for in-situ hgih temperature synchrotron studies"
####################################################
# top:/home/www/beamtime-requests/req00459.txt
# UNICAT Member Beam Time Request  #459
# created Sun Aug 24 15:20:43 CDT 2003
####################################################

beamline:
	33BM

collaboration:
	No

collaborator_Paul:
	ON

contact:
	kriven@uiuc.edu

days:
	4

description:
	We propose to use an image plate detector for in-situ investigations of lattice expansion and phase transformations at high temperatures (> 2000 degree Celsius) in oxide ceramics using thermal image furnace.
Although the use of 2-dimensional (2-D) detectors in powder diffraction experiments has several advantages over 1-dimensional (1-D) or point detectors, it has not been explored in high temperature phase transformation studies. So far, we have successfully conducted these studies using a point detector. Primary advantage of using a 2-D detector, instead of a point detector, is in the increased rate at which data can be acquired. Utilizing an image plate detector, will reduce the time for a given experiment by at least a factor of 30, and therefore will make it possible to study the kinetic aspects of phase transformations or chemical decomposition reactions. Such time resolved studies are not feasible with point detectors. As extended sections of the Debye cones can be observed using the image plate, preferred orientation conditions existing in the polycrystalline samples can be instantly detected and necessary measures can be taken to ensure complete randomness in sampling. 
We foresee this initiative to develop in two phases. In the first phase we propose to calibrate the image plate experiment set-up using standard reference materials. Preliminary studies during this phase will involve studies on a number of materials, which are suitable for calibration for high temperature experiments. Such materials, preferably, have cubic symmetry, possess a high, linear thermal expansion coefficient and should possess adsorption properties in the wavelength range of the thermal image furnace. Suitable candidates identified for the first phase of this study are MgO, CeO2, and Nb2O5.
In a second phase, the image plate technique will be used to study phase transformations in rare earth oxides such as niobates and titanates.

equipment_required:
	2-D image plate detector

experiment:
	Evaluation of a 2-D detector for in-situ hgih temperature synchrotron studies

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

hazards:
	None

minimumdays:
	3

name:
	Waltraud M. Kriven

new_request:
	ON

nonmembers:
	None

unacceptable_dates:
	9/8/03 - 9/11/03
10/3 - 10/5
11/6 - 11/11

z34ID_change_undulator:
	no

z34ID_details:
	

z34ID_parasitic:
	no


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