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Studies in the System MgUO 3 —MgUO 4
Author(s) -
HAAG R. M.,
MUNCY C. R.
Publication year - 1964
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.1151-2916.1964.tb14637.x
Subject(s) - fluorite , orthorhombic crystal system , solid solution , magnesium , phase (matter) , chemistry , oxygen , standard enthalpy of formation , decomposition , inorganic chemistry , analytical chemistry (journal) , crystal structure , crystallography , organic chemistry , chromatography
Magnesium uranate was prepared by standard solid‐state synthetic techniques. Decomposition pressures were measured between 1000° and 137OOC. At oxygen contents less than MgUO 3.5 a solid solution of fluorite structure was found. Above MgUO 3.75 the orthorhombic magnesium uranate phase was observed. The two phases were in equilibrium in air at 126OOC. The heat of solution of O 2 in the fluorite phase was 45 kcal mole −1 and the heat of the reaction MgUO 3.5 + 0.12O 2 → MgUO 3.75 was 83.3 kcal mole −1 (O 2 ).