Chemical Pressure, Structural Instability, and IR-Active Phonons in a Series of Rare-Earth Analogues of Francisite Cu3RE(SeO3)2O2Cl

ATR and transmission spectra of a series of rare-earth francisite-like phases Cu 3 RE(SeO 3 ) 2 O 2 Cl ( RE is a rare earth element, RE = Nd, Sm, Eu, Gd, Dy, Ho, Tm, Yb) were studied. The frequencies of the IR-active phonons of the crystals under study were determined. In the dependences of phonon f...

Full description

Saved in:
Bibliographic Details
Published in:Optics and spectroscopy 2023-09, Vol.131 (9), p.870-880
Main Authors: Novikova, N. N., Yakovlev, V. A., Kuznetsova, E. S., Berdonosov, P. S., Klimin, S. A.
Format: Article
Language:English
Subjects:
Earth analogs
Gadolinium
Lasers
Low temperature
Optical Devices
Optics
Phonons
Photonics
Physics
Physics and Astronomy
Rare earth elements
Samarium
Softening
Structural stability
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:ATR and transmission spectra of a series of rare-earth francisite-like phases Cu 3 RE(SeO 3 ) 2 O 2 Cl ( RE is a rare earth element, RE = Nd, Sm, Eu, Gd, Dy, Ho, Tm, Yb) were studied. The frequencies of the IR-active phonons of the crystals under study were determined. In the dependences of phonon frequencies on the ionic radius in a series of isostructural compounds, two tendencies are observed: a hardening of frequencies due to an increase in chemical pressure and a softening of the vibration frequencies, in which rare-earth ions are involved, due to an increase in the mass of a specific rare-earth ion. In the Cu 3 Dy(SeO 3 ) 2 O 2 Cl crystal, an anomalous softening of low-frequency phonons at low temperatures was observed, which was apparently associated with the structural instability of the compound.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X23070123