Magic-angle-spinning 29Si n.m.r. spectroscopy shows that 3 : 1 ordering (three AlO45– and one SiO44– surrounding each SiO44– tetrahedron) occurs in zeolite A irrespective of the method of preparation, whereas in sodalite and cancrinite which also have Si, Al ratios close to unity, either 4 : 0 or 3 : 1 ordering may occur.
J. M. Thomas, J. Klinowski, C. A. Fyfe, J. S. Hartman and L. A. Bursill, J. Chem. Soc., Chem. Commun., 1981, 678 DOI: 10.1039/C39810000678
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