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Optical and Mossbauer studies on YAG:Eu nanocrystals synthesized

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: S. Georgescu, S. Constantinescu, A. M. Chinie, A. S. Stefan, O. Toma, I. Bibi

Editorial: SPIE Proceedings , 6785, p.67850A01-6, 2007.

Rezumat:

Optical and Mossbauer spectroscopy were used to put into evidence the morphological changes induced by the thermal treatments in the YAG:Eu nanocrystals synthesized by a sol-gel method. Both methods exhibit a drastic change of the monitored parameters (ratio of the areas of the electric and the magnetic dipole transitions – for optical spectroscopy and
Mossbauer normalized area – for Mossbauer spectroscopy) at the phase transition amorphous-crystalline, followed by a slow evolution of these parameters with the increase of the annealing temperature. This slow evolution is due to the increase in size of the nanocrystals.

Cuvinte cheie: Nanocrystals, YAG:Eu, Sol-gel method