Crystalline ce(III)-la(III) double basic carbonates: A chemical shortcut to obtain nanometric la(III)-doped ceria

The controlled decomposition of crystalline Ce 1-xLa x(OH)CO 3 samples to give nanocrystalline Ce 1-XLa xO 2δ solid solutions is studied as a function of temperature and La(III) content. The hexagonal basic carbonates, related to the mineral bastnaesite, are shown to be suitable precursors for the o...

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Detalles Bibliográficos
Autores principales: Jobbágy, M., Sorbello, C., Sileo, E.E.
Formato: JOUR
Materias:
Bastnaesite
Doped ceria
Mild temperatures
Mixed oxide
Nanocrystalline
Nanometric
Surface area
Surfactant-assisted method
Thermal decompositions
Carbonates
Cerium
Crystalline materials
Lanthanum
Mining
Oxides
Precipitation (chemical)
Pyrolysis
Surface active agents
Cerium compounds
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_19327447_v113_n25_p10853_Jobbagy
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:The controlled decomposition of crystalline Ce 1-xLa x(OH)CO 3 samples to give nanocrystalline Ce 1-XLa xO 2δ solid solutions is studied as a function of temperature and La(III) content. The hexagonal basic carbonates, related to the mineral bastnaesite, are shown to be suitable precursors for the obtainment of Ce(IV-III), La(III) oxides when exposed to O 2 at mild temperatures (250 °C). The oxidation of Ce(III) centers triggers the massive decomposition of the whole precursor, acting as a chemical shortcut to achieve the domain of ceria phases, at temperatures 200 °C lower than the traditional procedures. The mixed oxides exhibit higher surface areas than those obtained for traditional coprecipitation-thermal decomposition procedures, achieving values in the range of those oxides prepared by costly surfactant-assisted methods. © 2009 American Chemical Society.

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