Details

Autor(en) / Beteiligte

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

Titel

Complexities of atomic structure at CdO/MgO and CdO/Al2O3 interfaces

Ist Teil von

• Journal of applied physics, 2018-11, Vol.124 (20)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2018

Quelle

American Institute of Physics (AIP) Journals

Beschreibungen/Notizen

• We report the interface structures of CdO thin films on 001-MgO and 0001-Al2O3 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-Al2O3 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.