New Opportunities for High-Resolution Solid-State NMR Spectroscopy of Oxide Materials at 21.1- and 18.8-T Fields

Characterisation of magnesium potassium phosphate cements blended with fly ash and ground granulated blast furnace slag

“…Therefore, it is suggested that the K2 environment must be incorporated within a secondary (or tertiary) phase in the GBFS/MKPC binder. Certain potassium feldspars (KAlSi 3 O 8 ) exhibit 39 K MAS NMR resonances within the region of the K2 environment [58][59][60], whilst their 27 Al and 29 Si signals at 50 to 65 ppm and − 86 to − 107 ppm respectively, are consistent with the spectra reported here. Given the aluminosilicate-rich nature of the SCMs and the large quantity of potassium added to these systems as KH 2 PO 4 , there could be the potential for poorly crystalline assemblages of this nature.…”

A model for the Ge–O coordination in germanate glasses

“…4 shows the behavior of the boron-oxygen coordination number, n BO , for lithium borate glasses, the most extensive set of NMR data in the literature [24]. Unfortunately, NMR has made little contribution to the study of germanate networks because germanium nuclei have a low c (gyromagnetic ratio) and hence are not readily accessible by NMR [25]. Fig.…”

Disorder and the extent of polymerization in calcium silicate and aluminosilicate glasses: O-17 NMR results and quantum chemical molecular orbital calculations

“…Finally, while it is not directly relevant to the structureproperty relations of the CS and CAS glasses, it is worth noting the effects of the external magnetic field on the spectra, which are one of the fundamental aspects of solid-state NMR of quadrupolar nuclei including O-17 (e.g., Kohn et al, 1998;Gan et al, 2002;Stebbins et al, 2002). Recent high field NMR studies of quadrupolar nuclides yield The extent of polymerization in aluminosilicate glasses improved resolution in the spectra with reduced perturbation by quadrupolar broadening.…”