Abstract
The volatility behavior of uranium oxide-lanthanum oxide solid solutions in a gas-fired furnace at 1675 deg C for 25, 136, and 310 hours is studied. The effect of composition on weight loss of exposed surface area is shown. Specimens containing more than 60 mole% LaO/sub 1.5/ had very low weight losses and their loss rates were nearly constamt. Microstructure examination indicated that grain growth and densification had occurred and that the specimen surfaces were relatively inert to attack by the furnace gases. Speci-mens within this range had O/M ratios below the stoichiometric MO/sub 2.00/ composition and were the most stable with regard to volatility behavior. The change from oxygendefictent to an oxygen-excess structure appears to be a significant factor in the volatility behavior of these solid solutions. (N.W.R.)
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