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Grain Growth in Sintered Uranium Dioxide: I, Equiaxed Grain Growth
Author(s) -
MacEWAN J. R.
Publication year - 1962
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.1151-2916.1962.tb11026.x
Subject(s) - equiaxed crystals , grain growth , grain size , uranium dioxide , materials science , annealing (glass) , metallurgy , uranium , atmospheric temperature range , metal , lattice constant , mineralogy , thermodynamics , chemistry , microstructure , physics , diffraction , optics
Grain growth was investigated in a UO 2 sinter of 94%) theoretical density over the temperature range 1555° to 2440°C. The results were in close, but not exact, agreement with a theoretical expression describing grain growth with a poly‐crystalline matrix. For the material studied the mean grain diameter D (μm) after annealing for t hours at a temperature T (°K) was given by the equationwhere D 0 and K 0 are, respectively, the initial grain size and a proportionality constant. Uranium metal was found in all specimens annealed above 2000°C. This was taken as evidence that the UO 2 lattice can be oxygen‐deficient at high temperatures.