Non-bridging oxygen and high-coordinated aluminum in metaluminous and peraluminous calcium and potassium aluminosilicate glasses: High-resolution 17O and 27Al MAS NMR results

2011 ◽  
Vol 96 (5-6) ◽  
pp. 841-853 ◽  
Author(s):  
L. M. Thompson ◽  
J. F. Stebbins
Keyword(s):  
High Resolution ◽  
Mas Nmr ◽  
Aluminosilicate Glasses ◽  
27Al Mas Nmr ◽  
Potassium Aluminosilicate

Si,Al ordering in leucite by high-resolution 27Al MAS NMR spectroscopy

1989 ◽  
Vol 16 (6) ◽  
pp. 591-598 ◽  
Author(s):  
Brian L. Phillips ◽  
R. James Kirkpatrick ◽  
Andrew Putnis
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Mas Nmr ◽  
27Al Mas Nmr

23Na 2D 3QMAS NMR and 29Si, 27Al MAS NMR investigation of Laponite and synthetic saponites of variable interlayer charge

Clay Minerals ◽  
2003 ◽  
Vol 38 (1) ◽  
pp. 63-69 ◽  
Author(s):  
L. Delevoye ◽  
J . -L. Robert ◽  
J . Grandjean
Keyword(s):  
High Resolution ◽  
Chemical Shift ◽  
Chemical Analysis ◽  
Nmr Spectra ◽  
Mas Nmr ◽  
High Resolution Spectrum ◽  
Isotropic Chemical Shift ◽  
Quadrupolar Interaction ◽  
27Al Mas Nmr ◽  
Good Agreement

Abstract29Si, 27Al MAS NMR is used to characterize Laponite RD and synthetic saponites of variable interlayer charge. The Si/Al ratios are in good agreement with the calculated charge from chemical analysis except for the lowest-charged saponite. In contrast to the 29Si MAS NMR spectra in which resolved signals are detected, the 27Al MAS NMR spectra show one signal whose linewidth increases with the clay charge. The water content of the clay samples was obtained from 1H MAS NMR.The 2D MQMAS NMR technique is required to obtain a high-resolution spectrum of nuclei with strong quadrupolar interaction. This method was applied to the 23Na nucleus of clay counterions and to the 27Al structural nucleus. One well-defined 23Na NMR signal is observed for all the clays studied except the highest-charged saponite. Possible explanations for this different behaviour are discussed. The calculated isotropic chemical shift evolves progressively with the clay charge whereas the deduced quadrupolar interaction does not change significantly. The 27Al 2D 3QMAS technique was not able to resolve more than one signal.

scholarly journals High-resolution 27Al MAS NMR spectroscopic studies of the response of spinel aluminates to mechanical action

2011 ◽  
Vol 21 (23) ◽  
pp. 8332 ◽  
Author(s):  
Vladimir Šepelák ◽  
Ingo Bergmann ◽  
Sylvio Indris ◽  
Armin Feldhoff ◽  
Horst Hahn ◽  
...  
Keyword(s):  
High Resolution ◽  
Spectroscopic Studies ◽  
Mechanical Action ◽  
Mas Nmr ◽  
27Al Mas Nmr

Ca–Mg mixing in aluminosilicate glasses: An investigation using 17O MAS and 3QMAS and 27Al MAS NMR

2008 ◽  
Vol 354 (40-41) ◽  
pp. 4644-4653 ◽  
Author(s):  
Kimberly E. Kelsey ◽  
Jeffrey R. Allwardt ◽  
Jonathan F. Stebbins
Keyword(s):  
Mas Nmr ◽  
Aluminosilicate Glasses ◽  
27Al Mas Nmr

ChemInform Abstract: 27Al MAS NMR Study of the Thermal Decomposition of NH4Al(SO4)2× 12 H2O.

ChemInform ◽  
2010 ◽  
Vol 23 (8) ◽  
pp. no-no
Author(s):  
G. WEGNER ◽  
G. BLUMENTHAL ◽  
D. MUELLER ◽  
D.-H. MENZ ◽  
A. SCHMALSTIEG
Keyword(s):  
Thermal Decomposition ◽  
Mas Nmr ◽  
Nmr Study ◽  
27Al Mas Nmr

29Si and 27Al MAS-NMR of NaOH-Activated Blast-Furnace Slag

1994 ◽  
Vol 77 (9) ◽  
pp. 2363-2368 ◽  
Author(s):  
Paul J. Schilling ◽  
Leslie G. Butler ◽  
Amitava Roy ◽  
Harvill C. Eaton
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Mas Nmr ◽  
27Al Mas Nmr ◽  
Furnace Slag

scholarly journals Influência da razão Al/argila no processo de pilarização de esmectita

Cerâmica ◽  
2006 ◽  
Vol 52 (323) ◽  
pp. 200-206 ◽  
Author(s):  
D. L. Guerra ◽  
V. P. Lemos ◽  
R. S. Angélica ◽  
C. Airoldi
Keyword(s):  
Mas Nmr ◽  
27Al Mas Nmr

As amostras de esmectita do estado do Pará, Amazônia, Brasil foram caracterizadas utilizando XRD, 27Al MAS NMR, FTIR e análise textural por curvas isotérmicas de adsorção-dessorção de nitrogênio. Na produção das argilas pilarizadas foi usado como íon intercalante, o Al13 (o íon de keggin), obtido pela reação das soluções AlC(l3)6H2O/NaOH, com razão molar OH/Al=2. Foram adotadas as proporções (Al/Argila): 5, 10, 20 e 25 meq/g de argila, com intercalação em 25 ºC, durante as 3 h e calcinada a 450 ºC (temperatura adequada da calcinação). O resultado mostrou que o processo de pilarização aumentou o espaçamento basal da argila natural de 14,02 para 18,84 Å e a área superficial de 44,30 para 198,03 m²/g (Al/Argila=25meq/g de argila, pH=4). O material preparado com relação Al/Argila=25meq/g de argila mostrou a incorporação máxima de Al. A estabilidade térmica da argila natural foi melhorada pelo procedimento de pilarização.

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