• journal_title：American Mineralogist
• Contributor：Xing Cheng ; Peidong Zhao ; Jonathan F. Stebbins
• Publisher：Mineralogical Society of America
• Date：2000-
• Format：text/html
• Language：en
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：85
• issue：7-8
• firstpage：1030
• section：Articles

Oxygen isotope exchange between natural analcime and water vapor at low pressure is studied by ¹⁷O NMR, which can distinguish Si-O-Si and Si-O-Al sites and provide information on site specific exchange kinetics and mechanisms. Si-O-Al sites in analcime are found to exchange faster than Si-O-Si sites at lower temperature (400 °C). At higher temperature (500 °C), the exchange rates for the two types of site are similar, suggesting that the exchange process for Si-O-Si has a higher activation energy, as predicted by published theoretical calculations. The overall exchange reaction appears to be controlled largely by reaction at sites, not diffusion. Static ¹⁷O spectra show an anomalously high ratio of Si-O-Si to Si-O-Al sites, suggesting the presence of a few percent of Al-O-Al sites, which are indeed resolved and observed in triple quantum magic-angle spinning (3QMAS) spectra.