Lattice-dynamics study of Cs/sub 2/SiF/sub 6/ with application to the vibronic optical spectra of MnF/sup -2//sub 6/ in Cs/sub 2/SiF/sub 6/

Journal Article · Mon Jan 15 00:00:00 EST 1979 · Phys. Rev., Sect. B. Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.19.1213· OSTI ID:6317248

Patterson, H H; Lynn, J W

Neutron scattering, Raman, and infrared absorption measurements have been made to study the lattice dynamics of cesium hexafluorosilicate (IV), a cubic antifluorite-type material. Dispersion relations for normal modes of vibration, with energies less than 20 meV (160 cm/sup -1/), along the (xi00), (xixixi), and (xixi0) symmetry directions have been determined by coherent-inelastic-neutron-scattering experiments. Light scattering measurements were used to determine the Raman-active zone-center vibrations, while infrared spectra showed both fundamental and combination bands. The rigid-ion lattice-dynamics model of O'Leary and Wheeler was fit to the available experimental data, and gave a reasonably good representation of the lattice dynamics. The model was then used to calculate the phonon density of states for Cs/sub 2/SiF/sub 6/. Phonon structure present in the luminescence spectra of MnF/sub 6//sup -2/ in Cs/sub 2/SiF/sub 6/ has been compared with the Cs/sub 2/SiF/sub 6/ phonon-density-of-states calculation. Selection rules have been used to assign the low-energy vibronic structure to high-symmetry critical points in the Brillouin zone of Cs/sub 2/SiF/sub 6/.

• Research Organization: Department of Chemistry, University of Maine, Orono, Maine 04473
• OSTI ID: 6317248
• Journal Information: Phys. Rev., Sect. B. Condens. Matter; (United States), Vol. 19:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CESIUM FLUORIDES
LATTICE VIBRATIONS
OPTICAL PROPERTIES
CESIUM SILICATES
MANGANESE COMPLEXES
MANGANESE FLUORIDES
ABSORPTION SPECTROSCOPY
DISPERSION RELATIONS
EXPERIMENTAL DATA
ISOLATED VALUES
LUMINESCENCE
NEUTRON DIFFRACTION
PHONONS
RAMAN SPECTRA
ALKALI METAL COMPOUNDS
CESIUM COMPOUNDS
COHERENT SCATTERING
COMPLEXES
DATA
DATA FORMS
DIFFRACTION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
MANGANESE COMPOUNDS
MANGANESE HALIDES
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUASI PARTICLES
SCATTERING
SILICATES
SILICON COMPOUNDS
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties