OH− impurities in co-doped LiNbO3:Cr 3+:ZnO congruent crystals

Autor:	F. Jaque, Gustavo Adrián Torchia, Jorge O. Tocho
Rok vydání:	2002
Předmět:	Absorption spectroscopy Infrared Chemistry Inorganic chemistry Doping Analytical chemistry Infrared spectroscopy General Chemistry Condensed Matter Physics Spectral line law.invention law Absorption band Impurity General Materials Science Electron paramagnetic resonance
Zdroj:	Journal of Physics and Chemistry of Solids. 63:555-559
ISSN:	0022-3697
DOI:	10.1016/s0022-3697(01)00193-7
Popis:	Infrared optical absorption has been used to study OH − impurities into congruent co-doped LiNbO 3 :Cr 3+ :ZnO crystals doped with different Zn 2+ concentration. The OH − IR absorption spectra present three bands that can be associated with different OH − complex centres available in the lattice. For crystals with lower Zn 2+ concentrations ( −1 ) is reported which is associated with the OH − unperturbed vibration. For crystals with higher Zn 2+ concentrations (>4.7%), two new bands associated with OH − vibration in distortion environment are reported. These bands are centred at 2827 nm (3537 cm −1 ) and 2847 nm (3512 cm −1 ) and can be associated with OH − –Zn 2+ and Cr 3+ (Li + )–OH − –Zn 2+ (Int.) complex centres, respectively. Electron paramagnetic resonance (EPR) has been used to identify the Cr 3+ centres in the lattice of the doped LiNbO 3 :ZnO crystals.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3677b216b308f474c97b2e2d926551eb https://doi.org/10.1016/s0022-3697(01)00193-7 Zobrazit plný text záznamu Full Text from ScienceDirect