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High Pressure Effects on Optical Properties of CdS
Author(s) -
Kobayashi M.,
Iwata H.,
Horiguchi T.,
Endo S.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221980169
Subject(s) - wurtzite crystal structure , nanocrystal , materials science , phase transition , raman spectroscopy , phase (matter) , crystal (programming language) , crystal structure , salt (chemistry) , mineralogy , analytical chemistry (journal) , chemical physics , crystallography , condensed matter physics , nanotechnology , optics , chemistry , metallurgy , zinc , physics , organic chemistry , chromatography , computer science , programming language
CdS undergoes a reversible phase transition from the wurtzite to the rock‐salt structure at 2.6 GPa. The LO Raman mode of samples retrieved from the high pressure phase shows a remarkable shift towards lower frequency relative to the LO mode of a single crystal. This shift is explained by the formation of nanocrystals and its interpretation in terms of the spatial correlation model yields nanocrystal diameters ranging from 6.7 to 10 nm. The diameter depends on the highest pressure applied. When pressure is applied again to a sample retrieved from a high pressure cycle, the phase transition pressure has been found to increase compared with that of a single crystal sample. These results lead to an explanation for the question why the wurtzite and rock‐salt structures coexist beyond the onset of the phase transition in CdS.