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    COLLOQUIUM OF THE LABORATORY FOR COMPUTER DESIGN OF MATERIALS
        Institute for Computational Sciences and Informatics
                       George Mason University
				CSI 929
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		Structure of Mixed-Oxide Aerogels:
	  An Unusual Small-Angle Neutron Scattering Study
             		
	               Celia Merzbacher
 	  Naval Research Laboratory, Washington D.C.

Aerogels are high porosity, high surface area materials with 
structure on the 1-100 nm scale.  Our group has prepared, for the 
first time, Ru-Ti oxide aerogels.  In the bulk, Ru-Ti oxides have 
high electronic conductivity due to interconnected metallic RuO2.  
In order to understand the aerogels' electrical behavior as a 
function of processing conditions, we have studied the structure 
of the Ru and Ti oxide phases independently using Contrast 
Matching SANS.  The strengths and weaknesses of this technique 
will be discussed. The results indicate that, despite their 
crystallographic similarities, the RuO2 and TiO2 components of the 
aerogels are structurally distinct.

                      Monday , February 10, 1997
                               4:30 pm
                      Room 206, Science & Tech. I
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Your are invited! Refreshments will be served!