H Koller, A Wölker, LA Villaescusa… - Journal of the …, 1999 - ACS Publications
Pentacoordinated silicon units, SiO4/2F-, were found by solid-state NMR experiments in
various as-made high-silica zeolites (Beta, SSZ-23, ITQ-3, ITQ-4, ZSM-12, Silicalite-1) that …