The coordination of A1 in several synthetic A1-substituted tobermorites was determined to be tetrahedral by solid-state 27Al MASNMR. Earlier results of tetrahedral Al coordination in Al-substituted tobermorites by x-ray emission were confirmed unequivocally by the new high resolution MASNMR technique. However, two 27Al chemical shifts at about 68 and 57 ppm were observed in the Al-substituted tobermorites which probably indicates two different environments for the Al atom in the structure. 27Al MASNMR technique clearly distinguishes the tetrahedral and octahedral coordination of Al in solid samples.
All Science Journal Classification (ASJC) codes
- Building and Construction
- Materials Science(all)