Transformations of micron-sized PbTe surface structures induced by low energy ions

• Published in: Journal of alloys and compounds 2021-11, Vol.883, p.160978, Article 160978
• Main Authors: Zayachuk, D.M., Zayachuk, Y.D., Hunyadi, M., Slynko, V.E., Csík, A.
• Format: Article
• Language: English
• Subjects: Argon ions; Conical bodies; Crystal structure; Crystal surfaces; Crystallography; Easy cleavage; Intermetallic compounds; Ion sputtering; IV-VI compounds; Pyramids; Reticular density; Ripples; Self-organization; Transformations
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.160978

•We observed peculiar form changes of micron-sized ion-induced structures on PbTe surface.•The first is transformation of the ion-induced micro-sized cones into micropyramids.•Another is formation of well-ordered ripples on the facets of micropyramids.•Cones transformation is caused by planes of easy cleavage and high reticular density.•Ripples appear due to self-organization of {111} and {110} planes forming the facets. [Display omitted] Formation and transformation of micron-sized structures on PbTe crystal surfaces under impact of low energy Ar+ ions is studied. New phenomena occurring due to interaction of energetic ions and atoms forming the main crystallographic planes of solid crystalline compounds, namely the transformation of ion-induced conical structures into pyramidal ones and the formation of facets of the micropyramids with well-ordered ripples during the process of transformation are revealed. We show that conical-pyramidal transformations occur on any PbTe sputtering surface, but the shape of pyramidal structures depends on the surface crystallographic orientation. If the pyramid originates from the ion-induced conical structure on PbTe target of (100) orientation it has the tetrahedral shape and its facets are covered with pronounced well-ordered ripples arranged in parallel to the base of the pyramid and closed at its edges. We show that: (i) micro-sized conical structures ion-induced on PbTe surface are transformed into pyramidal ones due to the tendency of the PbTe compound to the easy cleavage along crystallographic planes of high reticular density; (ii) the well-ordered ripples on the facets of the tetrahedral pyramids forming from conical structures appear due to self-organization of {111} and {110} crystallographic planes shaping pyramidal facets.