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Raman Scattering in ε‐GaSe and ZnIn 2 S 4 Single Crystals under Pressure
Author(s) -
Vinogradov E. A.,
Zhizhin G. N.,
Melnik N. N.,
Subbotin S. I.,
Panfilov V. V.,
Allakhverdiev K. R.,
Baeaev S. S.,
Zhitar V. F.
Publication year - 1980
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.2220990121
Subject(s) - raman scattering , raman spectroscopy , hydrostatic pressure , ionic crystal , ionic bonding , materials science , covalent bond , scattering , hydrostatic equilibrium , crystallography , molecular physics , analytical chemistry (journal) , chemistry , optics , ion , physics , thermodynamics , organic chemistry , quantum mechanics , chromatography
The influence of hydrostatic pressure on the Raman scattering spectra in ε‐GaSe (up to 8.5 kbar) and ZnIn 2 S 4 (up to 10.9 kbar) is investigated at 295 K. Parameters γ i – (1/ v i ) (d v i /d p ) are obtained for both the single crystals; for e‐GaSe values of the mode‐Gruneisen parameters are also obtained. The set of the parameters γ i (Γ i ) shows that these two crystals are layered ones with ionic‐covalent bonds inside the layers; the degree of ionicity in ZnIn 2 S 4 is higher than in ε‐GaSe. “Rigid‐layer” (interlayer) vibrations determined for ZnIn 2 S 4 and ε‐GaSe using γ i ‐parameters show that ZnIn 2 S 4 is not a one‐packet polytype.