Epitaxial Growth of Ag2S Film on Cleaved Surface of MgO(001)

✍ Scribed by Hiroshi Nozaki; Mitsuko Onoda; Keiji Kurashima; Takahumi Yao

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 257 KB
• Volume: 157
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.9042

✦ Synopsis

Epitaxial 5lms of monoclinic Ag 2 S with various thicknesses were prepared on cleaved surfaces of MgO(001) by molecular beam epitaxy. The epitaxial relations of the 5lms to the substrates were determined by X-ray di4ractometry. For thin 5lms, there are three kinds of crystallites with ( 012), (؊112), and (040) parallel to (001) MgO . These are all equivalent in the high-temperature cubic form of Ag 2 S, corresponding to {110}. With respect to epitaxy within the substrate surface for the crystallites, the diagonal direction of the body-centered pseudocubic sulfur arrays of Ag 2 S, [100] and [201], are parallel to [100] MgO , which is due to the coincidence of lattice dimensions of the 5lm and substrate. For thick 5lms, the epitaxial relations are (؊112)//(001) MgO and [421]//[010] MgO , or (012)//(001) MgO and [4, ؊2, 1]//[010] MgO . The epitaxy for thick 5lms is restricted not only by the surface periodicity of the substrate but also by the existence of steps generated during cleaving. The textures of thick 5lms observed by polarized microscopy con5rm that the epitaxial growth of the thick 5lms is restricted by the steps.