^<29>Si and ^1H NMR of Expandable Mica Ion-exchanged by NH_4^+
The <SUP>29</SUP>Si-NMR chemical shift of expandable mica ion-exchanged by NH<SUB>4</SUB><SUP>+</SUP> changes from −95 to −99.5 ppm after heat-treatment at 600 °C, which indicates a change from the mica to a talc structure. The <SUP>1</SUP>H static NMR spectrum of protons remaining in the structure after heating showed a sharp signal with a full width at half maximum of 0.8 kHz at 1.0 ppm, which suggests a rapid proton motion in the structure.
- Chemistry letters
Chemistry letters 1997(3), 199-200, 1997-03