Abstract
Solid-state high-resolution 29Si-NMR experiments were used to study the structure of the silicate layers in makatite and its crystalline silicic acid obtained by a cation exchange reaction from makatite. For each of the studied samples two well-separated NMR signals have been recorded which could be assigned to Q3 – [ − OSi(OSi ≡ )3] – units of the silicate layers of the corresponding compounds and to Q4 – [Si(OSi ≡ )4] – units of quartz impurities. Compared with makatite in the silicic acid a high-field shifted Q3-signal and a splitting of this signal into two component lines have been detected. These observations were attributed to structural changes which appeared as a result of the cation exchange reaction.
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