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Georgobiani A.N.,Russian Academy of Sciences | Pashaev A.M.,Azerbaijani National Academy of Aviation | Tagiev B.G.,Azerbaijani National Academy of Aviation | Aleskerov F.K.,Azerbaijan Academy of Sciences | And 2 more authors.
Inorganic Materials | Year: 2011

This paper examines the formation of arrays of interlayer nanostructures in layered crystals grown by directional solidification and the Bridgman method. Sb 2Te 3 and Bi 2Te 3 layers are shown to contain steplayered structures with nanostructured islands on them. Atomic force microscope images of interlayer nanostructures in such crystals are analyzed in terms of the physics of fractals and self-organization processes. © 2011 Pleiades Publishing, Ltd.


Georgobiani A.N.,Russian Academy of Sciences | Tagiev B.G.,Azerbaijani National Academy of Aviation | Tagiev B.G.,Azerbaijan Academy of Sciences | Pashaev A.M.,Azerbaijani National Academy of Aviation | And 7 more authors.
Inorganic Materials | Year: 2013

The photoluminescence and photoluminescence excitation spectra and luminescence decay kinetics of CaGa2S4:Eu2+ bulk crystals and powders ranging in particle size from 100 to 600 nm have been studied in the temperature range 77-300 K. The results indicate that the full width at half maximum of the photoluminescence band of the CaGa 2S4:Eu2+ nanopowders is about twice that of the bulk crystals. Analysis of the photoluminescence spectra shows that the energy position of the emission band is almost independent of the particle size, temperature, and excitation intensity in the ranges 77-300 K and 10-3 to 106 W/cm2, respectively. The shape of the photoluminescence band is well represented by a Gaussian. The excited state lifetime of the Eu2+ ion is ∼1000 ns as evaluated from the exponential portion of the luminescence decay curve. © 2013 Pleiades Publishing, Ltd.

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