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Investigation of the Infrared‐Active Lattice Vibration in SrCl 2
Author(s) -
Droste R.,
Geick R.
Publication year - 1974
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.2220620221
Subject(s) - lattice vibration , phonon , infrared , lattice (music) , reflection (computer programming) , materials science , reflectivity , far infrared , vibration , transmission (telecommunications) , optics , molecular physics , condensed matter physics , chemistry , physics , quantum mechanics , telecommunications , acoustics , computer science , programming language
SrCl 2 , single crystals were grown by the Czochralsky method. Their reflectivity at 300 K and transmission at 4.2 K were measured for frequencies from 10 to 930 cm −1 and 10 to 150 cm −1 , respectively. The reststrahl band found in the reflection spectrum has been analyzed by means of a classical oscillator model. In addition, a Kramers‐Kronig analysis was performed since a satisfactory fit could not be achieved with the classical model. The frequencies of the TO‐mode and the LO‐mode were determined to be 138 and 233 cm −1 , respectively. A pronounced shoulder on the reststrahl band was observed as is also the case for CaF 2 , BaF 2 etc. Its origin is discussed in terms of multi‐phonon processes. The results of the transmission measurements show that SrCl 2 , is transparent in the far infrared up to 110 cm −1 where the lattice absorption starts at 4.2 K.