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Precipitation and ordering in calcia‐ and yttria‐stabilized zirconia
Author(s) -
Schoenlein L. H.,
Hobbs L. W.,
Heuer A. H.
Publication year - 1980
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889880012332
Subject(s) - tetragonal crystal system , precipitation , transmission electron microscopy , fluorite , crystallography , materials science , electron diffraction , yttria stabilized zirconia , cubic zirconia , vacancy defect , neutron diffraction , diffraction , scattering , solid solution , condensed matter physics , chemistry , crystal structure , optics , physics , nanotechnology , metallurgy , ceramic , meteorology
Single crystals of ZrO 2 –15 mol % CaO and ZrO 2 –9 mol % Y 2 O 3 , annealed for either 400 h at 1273 K or 2.5 h at 1673 K and then quenched, were examined by electron diffraction and dark‐field transmission electron microscopy. The thermal treatments duplicated those of Faber, Mueller & Cooper [ Phys. Rev. B (1978), 17 , 4884–4888], who used elastic neutron scattering to investigate fluorite‐forbidden reflections which arise from what previous authors have called the `ordered' structure. The present results show that the extra reflections are due to precipitation of tetragonal ZrO 2 in both systems. Imaging with the diffuse‐scattered intensity also present reveals small domains, presumably associated with oxygen‐vacancy ordering, in the cubic solid‐solution matrix. The diffuse intensity is observed whether or not tetragonal ZrO 2 precipitates are present.