Effects of T2-relaxation in MAS NMR spectra of the satellite transitions for quadrupolar nuclei: a 27Al MAS and single-crystal NMR study of alum KAl(SO4)2·12H2O

Sol–gel synthesis and characterization of lithium aluminate (L–A–H) and lithium aluminosilicate (L–A–S–H) gels

“…The pulse length was 1 µs, corresponding to a pulse angle of less than 30°. At least 1000 scans were accumulated per specimen, and the recycle delay was set to 0.1 s. 27 Al chemical shifts were referenced to a 1 M solution of aluminium nitrate by using K‐alum as a secondary reference at 0.7 ppm 30 …”

Single-Crystal NMR Spectroscopy

“…Skibsted and co-workers [115] assessed the temperature dependence of the transverse relaxation time for 27 Al in in a single crystal of alun, KAl(SO 4 ) 2 ⋅12H 2 O, through measurement of the linewidths of the different transitions for 27 in a single crystal of emerald, Be 3 Al 2 Si 6 O 18 :Cr 3+ , as a function of temperature as reviewed in Fig. 34.…”

Solid state NMR spectroscopy

“…823 27 Al variable-temperature MAS NMR spectra were used to study T 2 -relaxation in a single crystal of KAl(SO 4 ) 2 Á 12H 2 O. 824 71 Ga MAS NMR spectra gave evidence about defect dynamics in crystalline GaN (cubic and hexagonal forms). 825 A 71 Ga NMR study has been made of atomic motions in an Sr 8 Ga 16 Ge 30 clathrate.…”