INVESTIGATION OF SOME PHASE-TRANSFORMATIONS INDUCED BY CO2-LASER IRRADIATION IN SOME RARE-EARTH-OXIDES

Citation
F. Vasiliu et al., INVESTIGATION OF SOME PHASE-TRANSFORMATIONS INDUCED BY CO2-LASER IRRADIATION IN SOME RARE-EARTH-OXIDES, Solid state ionics, 95(1-2), 1997, pp. 107-112
Citations number
10
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical
Journal title
ISSN journal
01672738
Volume
95
Issue
1-2
Year of publication
1997
Pages
107 - 112
Database
ISI
SICI code
0167-2738(1997)95:1-2<107:IOSPIB>2.0.ZU;2-X
Abstract
Binary rare-earth ceria-ytterbia and ceria-dysprosia and pure CeO2 hav e been subjected to CO2-laser irradiation. All the samples have been p repared by precipitation and controlled drying. Irradiated samples as well as the samples calcinated at 1273 K have been studied using TG-DT A, TEM and SAED, WAXS and FT-IR. Introduction of a second rare-earth o xide, like ytterbia or dysprosia led to an important increase of 'stab ility' towards the CO2-laser irradiation. Thermal investigation of the se samples revealed in fact a 'metastability' because, for the tempera tures of about 500 K, a release of oxygen has been observed. This beha viour could recommend CO2-laser irradiation as a possible alternative for activation of the oxidation catalysts.