Abstract
Laser ablation of CeO 2-–ZrO 2 (1 : 9 in molar ratio) target was conducted in air to study the effect of Zr 4+ dissolution on the shape of the CeO 2 condensates and to study the ways in which they coalesced and twinned, pertaining to preferred orientation of a film on a substrate. Transmission electron microscopic observations of the condensates collected on a carbon-coated collodion film indicated that slightly Zr 4+-dissolved CeO 2 crystallites formed cubo-octahedra which were coalesced as a single crystal over the contact plane {1 1 1} or {1 0 0}. Crystallites of different size were also found to be twinned over a specific {1 1 1} plane, which can be ascribed to coalescence-rotation of the crystallites over {1 1 1} contact plane in addition to growth mechanism. The twin relationship (1 1 1)‖(1 1 1); [1 1 ̄ 0]‖[1 1 2 ̄ ] requires opposite ABC stacking sequence of the cation sublattice across the contact plane {1 1 1}. Defects and distorted lattice planes formed close to the interface when the crystallites coalesced over imperfect contact plane, i.e. plane facet adjoining the curved regions between {1 1 1} and {1 0 0}.
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