Studies of site availability to metal ions in ion-exchangers rely heavily on traditional spectroscopic probes (i. r. , uv. /vis. , e. p. r. , etc. ). Each of these techniques has its limitations and only a very partial picture of the site occupied by the metal can be extracted. The introduction of a technique capable of probing bond distances and coordination numbers directly, whatever the state of the sample or its degree of loading, would help to place ion exchange phenomena on a firm structural foundation. Extended X-ray absorption fine structure spectroscopy (EXAFS) has become so widespread with the increasing availability of Synchrotron radiaton sources and the data analysis is now relatively well established that it promises to revolutionize the field. The contribution will describe continuing studies aimed at the structural determination of the entire site in layered phosphates.
EXAFS SPECTROSCOPY; A BREAKTHROUGH IN MONITORING METAL-SUPPORT INTERACTIONS IN ION EXCHANGE MATERIALS?
Alagna;Lucilla;
1984
Abstract
Studies of site availability to metal ions in ion-exchangers rely heavily on traditional spectroscopic probes (i. r. , uv. /vis. , e. p. r. , etc. ). Each of these techniques has its limitations and only a very partial picture of the site occupied by the metal can be extracted. The introduction of a technique capable of probing bond distances and coordination numbers directly, whatever the state of the sample or its degree of loading, would help to place ion exchange phenomena on a firm structural foundation. Extended X-ray absorption fine structure spectroscopy (EXAFS) has become so widespread with the increasing availability of Synchrotron radiaton sources and the data analysis is now relatively well established that it promises to revolutionize the field. The contribution will describe continuing studies aimed at the structural determination of the entire site in layered phosphates.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
