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Oxidation Studies of Urania‐Thoria Solid Solutions
Author(s) -
LYNCH E. D.,
HANDWERK J. H.,
HOENIG C. L.
Publication year - 1960
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1960.tb13607.x
Subject(s) - solid solution , sintering , uranium , oxygen , materials science , temperature cycling , analytical chemistry (journal) , nuclear chemistry , chemistry , mineralogy , thermal , metallurgy , thermodynamics , environmental chemistry , physics , organic chemistry
Nonstoichiometric solid solutions in the system UO 2 ‐ThO 2 were formed by sintering U 3 O‐ThO 3 and codigested nitrate mixtures in air. The oxygen content of the solid solutions was determined by a weight‐loss method. The changes occurring in oxygen content during solid solution formation and densification were determined for a 70.4 mole % UO 2 ‐29.6 mole % Tho 2 composition formed by sintering U 3 O 3 ‐ThO 2 in air. The first evidence of solid solution occurred at 1000° C. and solution was complete above 1250°C. Thermal cycling of solid solutions in air showed a minimum oxygen‐uranium ratio of 2.34 for the compositions studied. The minimum oxygen‐uranium ratio obtained during thermal cycling decreased with increasing Tho 2 content.