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Microstructure of Sn 1– x Pb x S grown by hot‐wall technique
Author(s) -
Wagner Gerald,
Kaden Ronny,
Lazenka Vera,
Bente Klaus
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201127019
Subject(s) - whiskers , orthorhombic crystal system , high resolution transmission electron microscopy , materials science , microstructure , crystallography , block (permutation group theory) , block structure , composite material , geometry , crystal structure , transmission electron microscopy , chemistry , nanotechnology , mathematics , welding
Orthorhombic Sn 1– x Pb x S ( x ≈ 0.1) was grown on glass substrates by hot‐wall technique. The entire deposited material is subdivided into a more or less continuous layer and whiskers grown on it. The former one consists of stacked blocks with their c ‐axis always parallel to growth direction. However, each block is alternately rotated 90° around the [001] against its underlying and following one. Therefore, the boundaries between them are twist boundaries having an orthogonal network of pure screw dislocations due to plastic relaxation. On these blocks Sn 1– x Pb x S whiskers of the same composition grow via a VLS mechanism. Especially, these whiskers consist of either thicker misaligned blocks, too (at 300 °C), or at higher growth temperatures ( e.g ., 320 °C) they contain many 90°‐twisted very thin strained sequences being intergrown pseudomorphically. Based on α‐SnS (Herzenbergite) a structural model is presented which is sufficient to describe the defects observed and to simulate the corresponding HRTEM images.