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Raman Spectra of CaAs 3 , ús 3 , SrAs 3 , BaAs 3 , and α‐EuP 3 and the Mixed Phases, Eu 1− x Sr x As 3 , and Eu(P 1− x As x ) 3
Author(s) -
Oleś B.,
Stolz H. J.,
Von Schnering H. G.
Publication year - 1981
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.2221060119
Subject(s) - raman spectroscopy , triclinic crystal system , monoclinic crystal system , spectral line , lattice vibration , crystallography , molecular vibration , chemistry , lattice (music) , phonon , crystal structure , molecular physics , materials science , physics , condensed matter physics , optics , astronomy , acoustics
The Raman spectra of the triarsenides MAs 3 (M equals; Ca, Eu, Sr, Ba), α‐EuP 3 and of solid solutions, Eu 1− x Sr x As 3 , and Eu(P 1− x As x ) 3 , are measured. A great similarity between the phonon spectra and simple scaling relations between the corresponding lattice vibrations of the triarsenides reflect the strong structural relationships between the monoclinic MAs 3 and slightly distorted triclinic CaAs 3 and suggest very similar vibrational eigenvectors. The Raman spectra of the solid solutions, Eu 1− x Sr x As 3 , and Eu(P 1− x As x ) 3 , display a mixed one‐ and two‐mode behaviour. It is shown that the strong coupling between atoms in the puckered As(P) layers reflects itself in the appearance of high‐frequency modes associated mainly with vibrations of atoms within the puckered layer, whereas the low‐frequency modes are dominated by metal vibrations.