ADSORPTION OF CARBON-DIOXIDE BY FERROELECTRIC LITHIUM-NIOBATE

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dc.contributor.authorCABRERA, AL
dc.contributor.authorVARGAS, F
dc.contributor.authorALBERS, JJ
dc.date.accessioned2025-01-21T01:34:34Z
dc.date.available2025-01-21T01:34:34Z
dc.date.issued1995
dc.description.abstractDesorption curves of CO2 are presented for powder of lithium niobate with main particle sizes of 1000, 500, 200, 100 and 50 mu m in diameter. The percentage of surface area occupied by CO2 molecules is calculated after measuring the total surface area of the samples using N-2 single point BET. Adsorption of CO2 and N-2 were measured with a Quantasorb instrument using flowing helium. The ratio of the surface area covered by CO2 with respect to N-2 changes from 11.5% for the 50 mu m particles down to 6.7% for the 100 mu m particles. Adsorption of CO2 for particles equal to or larger than 200 mu m could not be measured with our technique. XPS results on a single piece of lithium niobate indicated that CO2 is adsorbed on the surface when only Nb3+ ions are present. Induced crystallographic transformation of the crystal by an applied 2.5 kV field changes its surface composition from an initial mixture of Nb5+ and Nb3+ ions to pure Nb5+ ions and as a consequence of this change, adsorbed CO2 was released. A tentative explanation of these results is that the adsorption of the CO2 molecules by the ferroelectric substrate is due to a particular local electrostatic potential created by surface ions, in agreement with Pacchioni's work on other oxide surfaces.
dc.fuente.origenWOS
dc.identifier.issn0039-6028
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97574
dc.identifier.wosidWOS:A1995RQ63000008
dc.issue.numero3
dc.language.isoen
dc.pagina.final286
dc.pagina.inicio280
dc.revistaSurface science
dc.rightsacceso restringido
dc.subjectCARBON DIOXIDE
dc.subjectCHEMISORPTION
dc.subjectDIELECTRIC PHENOMENA
dc.subjectNIOBIUM
dc.subjectPHOTOEMISSION
dc.subjectPOLYCRYSTALLINE SURFACES
dc.subjectSOLID-GAS INTERFACES
dc.subjectTHERMAL DESORPTION
dc.subjectTHERMAL DESORPTION SPECTROSCOPY
dc.subjectX-RAY PHOTOELECTRON SPECTROSCOPY
dc.subject.ods07 Affordable and Clean Energy
dc.subject.odspa07 Energía asequible y no contaminante
dc.titleADSORPTION OF CARBON-DIOXIDE BY FERROELECTRIC LITHIUM-NIOBATE
dc.typeartículo
dc.volumen336
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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