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Faber, J. Jr.; Mueller, M.H.; Hitterman, R.L.
Argonne National Lab., IL (USA)1979
Argonne National Lab., IL (USA)1979
AbstractAbstract
[en] Crystallographic shear distortions have been observed in fluorite structure, single crystals of UO2 and Zr(Ca)O2/sub-x/ by neutron-diffraction techniques. These distortions localize on the oxygen sublattice and do not require the presence of an external strain. The internal rearrangement mode in UO2 is a transverse, zone boundary q vector = 2π/a (0.5, 0.0) deformation with amplitude 0.014 A. In Zr(Ca)O/sub 2-x/, the mode is a longitudinal, q vector = 2-/a (0,0,0.5) deformation with amplitude 0.23 A. Cation-anion elastic interactions dominate in selecting the nature of the internal distortion
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1979; 5 p; International conference on modulated structures; Kailua-Kona, HI, USA; 22 - 25 Mar 1979; Available from NTIS., PC A02/MF A01
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