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Oxygen polarity and interfacial atomic arrangement in an Mg sub(x)Zn sub(1-x)O/C-MgO/sapphire heterostructure

He, X ; Gu, L ; Guo, S ; Liu, Z ; Yu, R ; Mei, Z ; Du, X ; Liu, B ; Ikuhara, Y ; Duan, X

Journal of physics. D, Applied physics, 2013-04, Vol.46 (14), p.145303-1-5 [Periódico revisado por pares]

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Título:
Oxygen polarity and interfacial atomic arrangement in an Mg sub(x)Zn sub(1-x)O/C-MgO/sapphire heterostructure
Autor: He, X ; Gu, L ; Guo, S ; Liu, Z ; Yu, R ; Mei, Z ; Du, X ; Liu, B ; Ikuhara, Y ; Duan, X
Assuntos: Buffers ; Dislocations ; Heterostructures ; Magnesium ; Magnesium oxide ; Polarity ; Sapphire ; Wurtzite
É parte de: Journal of physics. D, Applied physics, 2013-04, Vol.46 (14), p.145303-1-5
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
content type line 23
ObjectType-Feature-1
Descrição: Oxygen polarity and interfacial structure of an Mg sub(0.55)Zn sub(0.45)O/Mg sub(0.17)Zn sub(0.83)O/MgO/sapphire heterostructure were determined by electron energy-loss spectroscopy and aberration-corrected scanning transmission electron microscopy. It was found that O-polarity occurs by an uncommon mechanism in the Mg sub(x)Zn sub(1-x)O film with a 0.5 nm-thick compressively strained rocksalt MgO buffer; and that the similar to 18% lattice mismatch between Mg sub(0.17)Zn sub(0.83)O and sapphire is mostly accommodated by misfit dislocations at the Mg sub(0.17)Zn sub(0.83)O/MgO interface. Density functional theory calculations indicate that the MgO buffer strongly tends to manifest a rocksalt structure rather than wurtzite. Zn substitution of the topmost Mg atoms in the MgO buffer is likely to induce such O-polarity.
Idioma: Inglês

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