Complexities of atomic structure at CdO/MgO and CdO/Al 2 O 3 interfaces

Everett D. Grimley, Alex P. Wynn, Kyle P. Kelley, Edward Sachet, Julian S. Dean, Colin L. Freeman, Jon Paul Maria, James M. Lebeau

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Abstract

We report the interface structures of CdO thin films on 001-MgO and 0001-Al 2O 3 substrates. Using aberration corrected scanning transmission electron microscopy, we show that epitaxial growth of (001)-CdO ∥(001)-MgO occurs with a lattice misfit greater than 10%. A high density of interface misfit dislocations is found to form. In combination with molecular dynamics simulations, we show that dislocation strain fields form and overlap in very thin heterostructures of CdO and MgO (<3 nm). On the c-Al 2O 3 substrate, we find that CdO grows with a surface normal of 025. We show that three rotation variants form due to the symmetry of the sapphire surface. These results contribute insights into the epitaxial growth of these rock-salt oxides.

Original languageEnglish (US)
Article number205302
JournalJournal of Applied Physics
Volume124
Issue number20
DOIs
StatePublished - Nov 28 2018

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Grimley, E. D., Wynn, A. P., Kelley, K. P., Sachet, E., Dean, J. S., Freeman, C. L., Maria, J. P., & Lebeau, J. M. (2018). Complexities of atomic structure at CdO/MgO and CdO/Al 2 O 3 interfaces. Journal of Applied Physics, 124(20), [205302]. https://doi.org/10.1063/1.5053752