Anisotropy of Selected Mechanical Properties of PbTe. Issue 6 (27th March 2019)

• Record Type: Journal Article
• Authors: Adamiak, Stanisław; Łusakowska, Elżbieta; Dynowska, Elżbieta; Minikayev, Roman; Dziawa, Piotr; Szczerbakow, Andrzej; Szuszkiewicz, Wojciech
• Other Names: Ruffenach Sandra guestEditor.; Tchernycheva Maria guestEditor.
• Is Part Of: Physica status solidi. Volume 256:Issue 6(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-27
• Subjects: IV–VI compounds -- nanoindentation -- nanohardness -- PbTe -- Young's modulus; Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201800549
• Languages: English
• ISSNs: 0370-1972

Abstract

Abstract : Selected mechanical properties are investigated for single PbTe crystals using the nanoindentation method. A few values of maximum load from 5 to 50 mN were selected for the measurements using the Berkovich form of the indenter. The nanohardness and Young's modulus for (100), (110), and (111)‐oriented planes are determined for the bulk crystal grown by self‐selecting vapor growth (SSVG) and characterized by X‐ray diffraction. The values of nanohardness and Young's modulus for a thick, MBE‐grown, (111)‐oriented PbTe layer deposited onto BaF2 substrate obtained for the comparison, using maximum load from 1 to 20 mN, indicate a difference between the mechanical properties of bulk crystal and thick MBE‐grown layer of the same material. The results suggest a much higher nanohardness value of the MBE‐grown layer than that of the bulk crystal. The values resulting from all measurements are compared with those given by theoretical predictions and a few existing experimental data. Abstract : The nanohardness and Young's modulus along [100], [110], and [111] high‐symmetry directions were determined for bulk PbTe crystal and for a thick, MBE‐grown, (111)‐oriented PbTe layer by the nanoindentation method. The nanohardness anisotropy did not exceed about 6%, the Young's modulus was almost fixed. Much higher nanohardness of the MBE‐grown layer than that of the bulk crystal was found.