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High resolution transmission electron microscopy has provided direct experimental evidence of monocrystalline, single-phase zinc-blende MgS. The authors report the first high resolution images of a metastable β-MgS epilayer. This material naturally has rocksalt crystalline structure, but β-MgS was grown in this work by molecular beam epitaxy on a ZnSe∕MgS multilayer buffered GaAs (001) substrate using Mg and ZnS sources, following a simple procedure. A metastable β-MgS layer of up to 125nm thick has been examined using this technique. Embedded stacking faults are observed in the β-MgS thick epilayer.

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