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Thermal Expansion of Uranium Pyrophosphate and of Ceramic Bodies in the System UO 2 –UP 2 O 7
Author(s) -
KIRCHNER HENRY P.,
MERZ KENNETH M.,
BROWN W. RICHARD
Publication year - 1963
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.1151-2916.1963.tb11697.x
Subject(s) - dilatometer , thermal expansion , uranium , ceramic , materials science , mineralogy , pyrophosphate , thermal , phase diagram , thermodynamics , phase (matter) , analytical chemistry (journal) , composite material , chemistry , metallurgy , physics , biochemistry , enzyme , organic chemistry , chromatography
During an investigation of methods of predicting the thermal expansion of pure, single‐phase ceramics, uranium pyrophosphate (UP 2 O 7 ) was synthesized and the thermal‐expansion properties were measured by the X‐ray diffraction and dilatometer methods. The basis for the selection of UP 2 O 7 is discussed. Cubic UP 2 O 7 expands with increasing temperature up to 400°C. Above this temperature the material contracts so that the specimen returns to the room‐temperature length at about 1000°C. Intermediate phases in the system UO 2 –UP 2 O 7 were prepared and the thermal‐expansion properties were measured. Ceramic bodies in the system UO 2 –UP 2 O 7 were prepared. The thermal‐expansion properties of these bodies are discussed in relation to the properties of the individual phases.