SI-29 AND H-1-NMR OF NATURAL AND SYNTHETIC XONOTLITE

This is the first report to show that the two Si-29-NMR signals (-86.3 , -87.1 ppm) of Q(2) of natural and synthetic xonotlites were clearly split, which is in accord with the crystal structure study of Kudoh et al.(1) The H-1-NMR spectra were deconvoluted into three lines at 2.19 , 1.86 and 5.26 ppm and assigned to structural Ca-OH, Si-OH and molecu lar water, respectively. The signal intensities are in good agreement with the thermogravimetric analysis.