Abstract
Heteroepitaxial growths of CuCl and CuBr, zinc-blende-structure ionic compounds, on (001) surfaces of MgO with rock-salt structure have been studied. Textured films of CuCl and CuBr with (111) orientations were grown from molecular beams at a typical substrate temperature of 333 K. We found that CuCl and CuBr had in-plane alignments with respect to the substrate lattice: CuCl[11̄0] was parallel to the MgO[110], [11̄0], [1̄1̄0] and [11̄0] axes; CuBr[11̄0] was parallel to the MgO[100], [010], [1̄00] and [01̄0] axes. This difference is explained by the change in the atomic configurations of the initial nuclei with respect to the substrate lattice arising from a 5% difference in lattice parameter between CuCl and CuBr. An atomic force microscopic observation showed no preferential nucleation of CuCl on step edges appearing on MgO(001). These results strongly suggest an occurrence of the initial nucleation on terraces of MgO(001), not at ledge and kink sites.
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