Abstract
Chemical modifications carried out on unique amorphous nano-structured calcium silicate have been traced by time-of-flight heavy-ion elastic recoil detection analysis (HERDA). It could be shown that this ion-beam analysis method allows not only surface but also depth analysis of the silicate samples and the modifications effected upon it. While providing a challenge for standard analysis methods, the highly porous, low-density nature of the calcium silicate proved to be an asset for the ion-beam analysis technique chosen. Presented are depth profiles giving elemental compositions and providing the bases for representative chemical formula for the silicates studied. It was proven that a study of the surface composition of this nano-structured silicate is sufficient for indicating the bulk composition of a sample of this material. Copyright © 2005 John Wiley & Sons, Ltd.
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