Solid‐State²⁷Al and ²⁹Si Magic‐Angle Spinning NMR of Aluminosilicate Gels

The environment of the Al and Si atoms of diphasic and single‐phase aluminosilicate gels was determined by solid‐state ²⁷Al and ²⁹Si magic‐angle spinning nuclear magnetic resonance (MASNMR) spectroscopy, The tetrahedral coordination of Al increased with decreasing Al/Si ratio in single‐phase gels but not in diphasic gels. The results showed that ultrahomogeneous mixing on a next‐nearest‐neighbor level is achieved in single‐phase aluminosilicate gels, while in diphasic gels this has successfully been avoided.