Title XANES observations of the inhibition and promotion of anatase and rutile phases in silver containing films
Authors Alfredo Mosquera, Adolfo , ENDRINO ARMENTEROS, JOSÉ LUIS, Maria Albella, Jose
External publication Si
Means J Anal At Spectrom
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 3.46600
SJR Impact 0.97500
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-84900617266&doi=10.1039%2fc3ja50354b&partnerID=40&md5=0539fee4d23192760de99f88818d0c6c
Publication date 01/04/2014
ISI 000333660100016
Scopus Id 2-s2.0-84900617266
DOI 10.1039/c3ja50354b
Abstract X-ray absorption near-edge structure (XANES) spectroscopy has been applied to characterize the phase evolution of Ag-TiO2 films subjected to annealing treatments up to 1000 degrees C. Silver has been theoretically predicted as a rutile promoter in anatase powders lowering the transition temperature, however, no systematic studies on films have been reported yet. In this work, the Ti L-2,L-3- and O K-edge in XANES spectra were used as fingerprints of the phase structure of the films. The results show that silver atoms strongly affect the transition of the initially amorphous films to the anatase structure, delaying the crystallization temperature up to 400 degrees C and, at the same time, promoting the subsequent phase transformation from anatase to rutile at temperatures as low as 600 degrees C. These results have been confirmed by X-Ray Diffraction (XRD) analysis as well as by High Resolution TEM images (HRTEM) of films.
Keywords Anatase powders; Anatase structures; Annealing treatments; Crystallization temperature; High-resolution TEM; Phase evolutions; Systematic study; XANES spectra; Amorphous films; Oxide minerals; Titaniu
Universidad Loyola members

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