INFRARED-ABSORPTION STUDY OF THE OH VIBRATIONAL BAND IN LINBO3 CRYSTALS

Autor(en): KOVACS, L
WOHLECKE, M
JOVANOVIC, A
POLGAR, K
KAPPHAN, S
Stichwörter: ANHARMONIC OSCILLATOR; Chemistry; Chemistry, Multidisciplinary; DEFECT ABSORPTION; DEFECTS; DEPENDENCE; INFRARED SPECTRAS; LINBO3; LITHIUM-NIOBATE; OH STRETCH MODE; OXIDE; Physics; Physics, Condensed Matter; SPECTROSCOPY
Erscheinungsdatum: 1991
Herausgeber: PERGAMON-ELSEVIER SCIENCE LTD
Journal: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volumen: 52
Ausgabe: 6
Startseite: 797
Seitenende: 803
Zusammenfassung: 
Stoichiometry and temperature dependence of the OH vibrational band was studied in LiNbO3 crystals. The decomposition of the bands using the product function of a Lorentzian and a Gaussian showed that in Li deficient crystals the absorption bands consist of at least four components in contrast to more or less perfect stoichiometric crystals which reveal only one to three components. The two new peaks are interpreted by the appearance of two energetically different proton sites in the LiNbO3 structure having ilmenite-like segments. Above 300-degrees-C only one broad band dominates at about 3465 cm-1 indicating the increased mobility of the protons and the interaction with the lattice.
ISSN: 00223697
DOI: 10.1016/0022-3697(91)90078-E

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