Investigation of some phase transformations induced by CO2-laser irradiation in some rare-earth oxides
✍ Scribed by F. Vasiliu; C. Sârbu; V.I. Pârvulescu
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 536 KB
- Volume
- 95
- Category
- Article
- ISSN
- 0167-2738
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✦ Synopsis
Binary rare-earth ceria-ytterbia and ceria-dysprosia and pure CeO, have been subjected to CO,-laser irradiation. All the samples have been prepared by precipitation and controlled drying. Irradiated samples as well as the samples calcinated at 1273 K have been studied using TG-DTA, TEM and SAED, WAXS and Ff-IR. Introduction of a second rare-earth oxide, like ytterbia or dysprosia led to an important increase of 'stability' towards the CO,-laser irradiation. Thermal investigation of these samples revealed in fact a 'metastability' because, for the temperatures of about 500 K, a release of oxygen has been observed. This behaviour could recommend CO,-laser irradiation as a possible alternative for activation of the oxidation catalysts.