%0 Journal Article
%A Shtukenberg, Alexander G.
%A Astilleros García-Monge, José Manuel
%A Putnis, Andrew
%T Nanoscale observations of the epitaxial growth ofhashemite on barite (001)
%D 2005
%@ 0039-6028
%U https://hdl.handle.net/20.500.14352/50342
%X The heteroepitaxial growth of hashemite BaCrO4 on barite BaSO4(001) from supersaturated aqueous solutionswas observed in situ using an atomic force microscope (AFM). It was shown that the first hashemite layer growsvia two-dimensional nucleation easily forming a complete epitaxial layer,which is likely to have a low level ofintrinsic stress. Two-dimensional nucleation of the second and subsequent layers proceeds with significantly lowerrates,and growth occurs with lower step velocities. These layers seem to have significant level of intrinsic stress andtend to reduce it via the formation of free surface normal to the growth layer (holes in the layer,dendrite-like shapeof nuclei and steps,preferable formation of nuclei at the step edges). As a result,the initially flat surface becomesrough. The process described corresponds to the Stranski-Krastanov epitaxial growth mode, which is well knownfor growth of semiconductor and metal films but not previously recognised for crystals grown from aqueoussolutions.
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