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Equilibrium Oxygen Pressures Over Solid Solutions of Urania‐Yttria and Urania‐Lanthana at 1100° to 14OO°C
Author(s) -
HAGEMARK K.,
BROLI M.
Publication year - 1967
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.1151-2916.1967.tb14999.x
Subject(s) - partial pressure , yttrium , oxygen , enthalpy , solid solution , thermodynamics , yttria stabilized zirconia , partial melting , lanthanum , chemistry , analytical chemistry (journal) , materials science , inorganic chemistry , cubic zirconia , ceramic , metallurgy , oxide , geology , physics , organic chemistry , chromatography , paleontology , mantle (geology)
Using a thermobalance, the oxygen content of urania containing small amounts of yttria or lanthana was determined as a function of the oxygen partial pressure at 1100° to 1400°C. Values for the partial free enthalpy, the partial enthalpy, and partial entropy of oxygen were calculated. Equilibrium oxygen pressures over the solid solutions (U, Y, or La)O 2+ x were higher than for pure UO 2+ X . Both the partial enthalpy and partial entropy of oxygen decreased with the addition of yttrium and lanthanum, the change being larger in the latter case. The effects observed experimentally are discussed on the basis of differences in charge and size of the foreign cation relative to the uranium ion.