High resolution 17O MAS and triple-quantum MAS NMR studies of gallosilicate glasses

17O NMR spectroscopy of crystalline microporous materials

“…However, these relationships resulted in the overlap of signals from different species in the MQMAS spectrum, hindering unambiguous deconvolution. Notably, the work disproved that the simple assignment of all signals at low δ 1 to Ga–O–Ga (as suggested in previous work on glasses), 105 although the presence of these linkages (which contravene Lowenstein's rule) could not be ruled out completely. The computational work also enabled a detailed investigation into the dependence of the 17 O NMR parameters on local structure, revealing a correlation between 17 O δ iso and the T–O–T′ angle and (unexpectedly) with the average O–T–O angle, while exact values are also affected by the distance to the nearest charge-balancing Rb cation.…”

Oxygen-17 nuclear magnetic resonance measurements on apatite-type lanthanum silicate (La9.33(SiO4)6O2)

“…We used the peak of H2 17 O as a reference in the abovementioned measurement. Magic-Angle Spinning (MAS) measurements at room temperature were performed on AVANCE -400, -750, and ECA 930 at sample spinning speeds of 14, 30, and 22 kHz, respectively.…”

“…Among the apatite-type materials, we chose lanthanum silicate because of its high conductivity [1,7]. O-17 NMR has been applied to investigate the structure around oxide ions [15] or defects in oxide-ion conductors [16][17][18][19]. It is well known that the line shape of the solid-state NMR spectrum is changed because of the motion that averages out anisotropic effecting terms such as chemical shift anisotropy, dipole-dipole, and quadrupole coupling effects.…”

Effect of pressure on structure of oxide glasses at high pressure: Insights from solid-state NMR of quadrupolar nuclides

“…11 B, 17 O, 23 Na, and 27 Al) in diverse non-crystalline solids at 1 atm [40]. While the following list is by no means complete (particularly for oxide glasses explored by 27 Al 3QMAS NMR), these non-crystalline oxides studied by 3QMAS NMR techniques include amorphous alumina [41,42], binary aluminates [43,44], binary silicates [45,46], mixed cation silicates [47][48][49][50], aluminosilicates [40,43,[51][52][53][54][55][56][57][58], hydrous aluminosilicates [45,59,60], borate and borosilicates [61][62][63][64][65], boroaluminates [66], germanates and germanosilicates [64,[67][68][69], borogermanates [70], gallosilicates [71], binary and ternary phosphates [72][73][74], and other multi-component oxide glasses with geological and environmental implications [75]…”