Study of structural transition from metastable zinc blende to rocksalt crystal in molecular beam epitaxy MgS∕ZnSe∕GaAs multilayer system

Autor:	J. K. Morrod, Gianluca Calestani, Kevin Alan Prior, F. Germini, Alessandra Catellani, Lucia Nasi, C. Bocchi
Rok vydání:	2007
Předmět:	Crystal Magnesium sulfide chemistry.chemical_compound Crystallography Phase transition Materials science Physics and Astronomy (miscellaneous) chemistry Transmission electron microscopy Nucleation Crystal structure Gallium arsenide Molecular beam epitaxy
Zdroj:	Applied Physics Letters. 91:111908
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.2784182
Popis:	The stable crystal structure of magnesium sulfide (MgS) is rocksalt. However, the metastable zinc-blende structure is obtained when MgS is deposited by molecular beam epitaxy (MBE) on (001) zinc-blende substrates with a relatively small misfit. In the present work, the zinc blende to rocksalt phase transition is analyzed in MgS∕ZnSe∕GaAs multilayer samples grown by MBE with different MgS layer thicknesses. By x-ray diffraction and transmission electron microscopy methods, a partial nucleation of MgS rocksalt is evidenced and correlated to the presence of stacking faults at the bottom interface. The unexpected coexistence of both rocksalt and zinc-blende MgS structural phases is discussed.
Databáze:	OpenAIRE
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