Istituto dei materiali per l'elettronica ed il magnetismo     
Nasi L., Bocchi C., Catellani A., Germini F., Morrod J. K., Prior K. A., Calestani G. Study of structural transition from metastable zinc blende to rocksalt crystal in molecular beam epitaxy MgS/ZnSe/GaAs multilayer system. In: Applied Physics Letters, vol. 91 (11) article n. 111908. AIP, 2007.
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.
URL: http://dx.doi.org/10.1063/1.2784182
DOI: 10.1063/1.2784182
Subject 64.70.K-

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