The size dependent adsorption properties of ferroelectric particles

Cabrera, AL; Vargas F.; Zarate, RA; Cabrera, GB; Espinosa-Gangas, J

Abstract

We investigated the ability of a ferroelectric oxide surface to adsorb gaseous molecules with a dipole moment or an induced dipole moment. All the ferroelectric crystals studied readily adsorb carbon dioxide, thus our studies are centered on the adsorption studies of this molecule. We describe in this paper the present status of our studies: carbon dioxide-thermal desorption curves are obtained for powders of barium titanate, potassium niobate and lithium niobate with main particle sizes of 1000, 500, 200, 100 and 50 ?m in diameter. Two adsorption states are observed in these curves: a stronger state and a weaker state which appears only on the smallest particles measured (50 ?m). The percentage of surface area occupied by the CO2 molecules on the ferroelectric crystals is calculated after measuring the total surface area of the samples using the N2 single point BET method. Raman characterization as well as X-ray diffraction of the powders indicates that the dominant surface orientation of the crystallites changes when the particles become smaller than 100 ?m. © 2001 Elsevier Science Ltd.

Más información

Título según WOS: The size dependent adsorption properties of ferroelectric particles
Título según SCOPUS: The size dependent adsorption properties of ferroelectric particles
Título de la Revista: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volumen: 62
Número: 5
Editorial: PERGAMON-ELSEVIER SCIENCE LTD
Fecha de publicación: 2001
Página de inicio: 927
Página final: 932
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S0022369700002560
DOI:

10.1016/S0022-3697(00)00256-0

Notas: ISI, SCOPUS