Oxygen isotopic effect on the IR reflectivity spectra of a La2NiO4.14 single crystal

Infrared reflectivity spectra measurements have been realised at T=300 K on the oxygen–isotope exchanged single crystals (16O and 18O) of La2NiO4+δ with δ=0.14. One of the main results lies on transfer of the spectral weight from the mid-infrared spectral range to the far-infrared range upon 18O sub...

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Bibliographic Details
Published in:Solid state sciences 2004-10, Vol.6 (10), p.1131-1137
Main Authors: ROUSSEAU, Benoit, BASSAT, Jean Marc, BLIN, Annie, SILVA DE OLIVEIRA, Marcelo, ODIER, Philippe, MARIN, Christophe, SIMON, Patrick
Format: Article
Language:English
Subjects:
Chemical Sciences
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Exact sciences and technology
Material chemistry
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Theory of crystal structure, crystal symmetry
calculations and modeling
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Summary:Infrared reflectivity spectra measurements have been realised at T=300 K on the oxygen–isotope exchanged single crystals (16O and 18O) of La2NiO4+δ with δ=0.14. One of the main results lies on transfer of the spectral weight from the mid-infrared spectral range to the far-infrared range upon 18O substitution. This striking effect is studied in the framework of the harmonic oscillator concept by simulating the experimental data with a dielectric function model based on the generalisation of the Lyddane–Sachs–Teller relationship. ..
ISSN:1293-2558
1873-3085
DOI:10.1016/j.solidstatesciences.2004.06.002