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Surface morphology and growth mechanisms of argyrodite‐type Cu 6 PS 5 hal crystals
Author(s) -
Fiechter S.,
Eckstein J.,
Van Enckevort W. J. P.,
Binsma J. J. M.
Publication year - 1983
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170180706
Subject(s) - hillock , sublimation (psychology) , crystal growth , crystallography , morphology (biology) , materials science , chemistry , chemical engineering , composite material , psychology , psychotherapist , biology , engineering , genetics
Single crystals of Cu 6 PS 5 Hal (Hal = Cl, Br, I) have been grown by dissociative sublimation and by chemical vapour transport with P, S, Hal, CuHal and combinations thereof as transporting agents in the temperature range 800 to 1000 K. Microscopic observation of the tetrahedral faces revealed several growth features. Macrosteps, closed loop steps and surface protuberances are always accompanied with the presence of liquid CuHal/Cu 2 S droplets on the growing crystal surface. The phenomena are characteristic for a two‐dimensional Vapour‐Liquid‐Solid growth mechanism. In the absence of CuHal/Cu 2 S liquid phase, direct growth from the gas phase (VS growth) takes place leading to hillocks and growth spirals with low step heights (∼ 5–10 Å).