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MAS-NMR spectra

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Journal Article

Influence of hydration on 23 Na, 27 Al, and 29 Si MAS-NMR spectra of sodium saponites and sodium micas

Jesus Sanz, Isabel Sobrados, Jean-Louis Robert
Published: 01 May 2015
American Mineralogist (2015) 100 (5-6): 1076–1083.
DOI: https://doi.org/10.2138/am-2015-4832
... spectroscopy. The presence of anhydrous, one-layer and two-layer hydrates, deduced by X-ray diffraction, has been associated with specific lines detected in 23 Na MAS-NMR spectra. In these phyllosilicates, the location of tetra- and octahedral charge has been analyzed by 27 Al MAS-NMR spectroscopy. The salient...
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Journal Article

Effects of secondary iron phases on kaolinite 27 Al MAS NMR spectra

Paul A. Schroeder, Robert J. Pruett, Vernon J. Hurst
Published: 01 August 1998
Clays and Clay Minerals (1998) 46 (4): 429–435.
... substituted Fe (super 3+) and secondary Fe phases on the NMR signal. Known additions of goethite and hematite were made to determine the response of kaolinite 27 Al MAS NMR spectra and sample magnetic susceptibilities. Results from high field (11.7 T) NMR studies show positive correlations between 1) Fe...
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Journal Article

A reassessment of the 29 Si MAS-NMR spectra of sepiolite and aluminated sepiolite

J. B. d'Espinose de la Caillerie, J. J. Fripiat
Journal: Clay Minerals
Published: 01 September 1994
Clay Minerals (1994) 29 (3): 313–318.
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<span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of Li + -Mnt25 and Li + -Mnt200: (a) 29 Si–<span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span>...

MAS NMR spectra of Li + -Mnt25 and Li + -Mnt200: (a) 29 Si–MAS NMR spectra...

Published: 25 April 2024
Figure 6. MAS NMR spectra of Li + -Mnt25 and Li + -Mnt200: (a) 29 Si–MAS NMR spectra; (b) 27 Al–MAS NMR spectra, the reference mark (※) indicates spinning sidebands; (c) 7 Li–MAS NMR spectra, the reference mark (※) signifies spinning sidebands; and (d) partial amplification from the 7 Li–MAS
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( a ) The 39 K <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> and ( b ) 23 Na <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of selecte...

( a ) The 39 K MAS NMR spectra and ( b ) 23 Na MAS NMR spectra of selecte...

Published: 01 November 2013
Figure 9 ( a ) The 39 K MAS NMR spectra and ( b ) 23 Na MAS NMR spectra of selected K-feldspars at 19.6 T. Dotted lines for M 1 sites and dashed lines for M 2 sites, simulated spectra as fine continuous lines ( Table 4 ), experimental spectra as thick continuous lines. The asterisk
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29 Si <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> and 27 Al <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of RPal and TUPal.

29 Si MAS NMR and 27 Al MAS NMR spectra of RPal and TUPal.

Published: 01 October 2018
Figure 5. 29 Si MAS NMR and 27 Al MAS NMR spectra of RPal and TUPal.
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29 Si <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> spectrum ( top ) and 1 H- 29 Si CP-<span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> obtained ...

29 Si MAS NMR spectrum ( top ) and 1 H- 29 Si CP-MAS NMR spectra obtained ...

Published: 01 March 2017
Figure 7 29 Si MAS NMR spectrum ( top ) and 1 H- 29 Si CP-MAS NMR spectra obtained at a contact time of 2, 4, 8, and 20 ms ( bottom to top as labeled ) for a hydrous forsterite sample containing about 0.5 wt% H 2 O. The spinning rate was 20 kHz for all. The four CP spectra are plotted
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27 Al <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> for synthetic phyllosilicates (top). 27 Al <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> s...

27 Al MAS NMR spectra for synthetic phyllosilicates (top). 27 Al MAS NMR s...

Published: 01 July 2008
F igure 1. 27 Al MAS NMR spectra for synthetic phyllosilicates (top). 27 Al MAS NMR spectrum for CAW1974 ( Lee et al. 2003 ) (kaolinite-smectite mixture) is also shown here for comparison. The asterisk refers to spinning side bands. The enlarged spectrum (bottom) is also shown to manifest
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<span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of sample showing 27 Al <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> at ( a ) 8.45 T, ( b ) 14....

MAS NMR spectra of sample showing 27 Al MAS NMR at ( a ) 8.45 T, ( b ) 14....

Published: 01 May 2008
F igure 1. MAS NMR spectra of sample showing 27 Al MAS NMR at ( a ) 8.45 T, ( b ) 14.1 T, ( c ) 16.45 T, and ( d ) 11 B MAS NMR at 14.1 T together with the simulations of the 27 Al spectra.
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11 B <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of liddicoatite: (a) <span class="search-highlight">NMR</span> 1; (b) <span class="search-highlight">NMR</span> 2; (c) <span class="search-highlight">NMR</span> 3; (d) ...

11 B MAS NMR spectra of liddicoatite: (a) NMR 1; (b) NMR 2; (c) NMR 3; (d) ...

Published: 01 February 2011
Fig. 2. 11 B MAS NMR spectra of liddicoatite: (a) NMR 1; (b) NMR 2; (c) NMR 3; (d) NMR 4.
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27 Al <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of liddicoatite: (a) <span class="search-highlight">NMR</span> 1; (b) <span class="search-highlight">NMR</span> 2; (c) <span class="search-highlight">NMR</span> 3; (d)...

27 Al MAS NMR spectra of liddicoatite: (a) NMR 1; (b) NMR 2; (c) NMR 3; (d)...

Published: 01 February 2011
Fig. 3. 27 Al MAS NMR spectra of liddicoatite: (a) NMR 1; (b) NMR 2; (c) NMR 3; (d) NMR 4.
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29 Si CP-<span class="search-highlight">MAS</span> and 27 Al <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of products obtained with AlCl 3 .6...

29 Si CP-MAS and 27 Al MAS NMR spectra of products obtained with AlCl 3 .6...

Published: 01 April 2015
Figure 3 29 Si CP-MAS and 27 Al MAS NMR spectra of products obtained with AlCl 3 .6H 2 O and Al(NO 3 ) 3 .9H 2 O as Al sources.
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Superposition of 29 Si <span class="search-highlight">MAS</span> and 1 H- 29 Si CP-<span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of the K6N6 ...

Superposition of 29 Si MAS and 1 H- 29 Si CP-MAS NMR spectra of the K6N6 ...

Published: 01 March 2003
F ig . 10. Superposition of 29 Si MAS and 1 H- 29 Si CP-MAS NMR spectra of the K6N6 sample.
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6 Li <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of sample A-1. ( a ) 6 Li <span class="search-highlight">MAS</span> spectrum, ( b ) 6 Li{ ...

6 Li MAS NMR spectra of sample A-1. ( a ) 6 Li MAS spectrum, ( b ) 6 Li{ ...

Published: 01 January 2003
F igure 12. 6 Li MAS NMR spectra of sample A-1. ( a ) 6 Li MAS spectrum, ( b ) 6 Li{ 1 H} CP MAS spectrum, ( c ) 6 Li{ 19 F} CP MAS spectrum, ( d - f ) 6 Li REDOR spectra (for rotor periods): ( d ) full echo, no dephasing pulses, ( e ) 1 H dephasing pulses, ( f ) 19 F dephasing pulses
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43 Ca <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> (natural, 0.14% isotopic abundance, 8.5 T, 14 mm <span class="search-highlight">NMR</span> ...

43 Ca MAS NMR spectra (natural, 0.14% isotopic abundance, 8.5 T, 14 mm NMR ...

Published: 01 January 2014
Figure 5 43 Ca MAS NMR spectra (natural, 0.14% isotopic abundance, 8.5 T, 14 mm NMR rotor) and line shape simulations for calcite and aragonite. [Used by permission of Elsevier, from Dupree et al. (1997) Chemical Physics Letters , Vol. 276, Fig. 2, p. 401].
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13 C CP-<span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> of citrate hydrotalcite ( A ) and 13 C <span class="search-highlight">NMR</span> spectru...

13 C CP-MAS NMR spectra of citrate hydrotalcite ( A ) and 13 C NMR spectru...

Published: 01 February 2007
F igure 4. 13 C CP-MAS NMR spectra of citrate hydrotalcite ( A ) and 13 C NMR spectrum of 1 M sodium citrate solution ( B ).
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17 O <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> for phyllosilicates (thick lines). Thin <span class="search-highlight">spectra</span> are si...

17 O MAS NMR spectra for phyllosilicates (thick lines). Thin spectra are si...

Published: 01 July 2008
F igure 3. 17 O MAS NMR spectra for phyllosilicates (thick lines). Thin spectra are simulation results for pyromus46 and pyromus55. Simulation of each O site for (thin lines) pyromus55 based on NMR parameters from 27 O 3QMAS NMR spectra (from peak position and center of gravity) as initial
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1 H <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> at a spinning rate of 24 kHz for ussingite samples 1 ( ...

1 H MAS NMR spectra at a spinning rate of 24 kHz for ussingite samples 1 ( ...

Published: 01 May 2024
Figure 3. 1 H MAS NMR spectra at a spinning rate of 24 kHz for ussingite samples 1 ( a ) and 2 ( b ).
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27 Al <span class="search-highlight">MAS</span> <span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> [( a ) full range with intensity truncated for the ce...

27 Al MAS NMR spectra [( a ) full range with intensity truncated for the ce...

Published: 01 May 2024
Figure 6. 27 Al MAS NMR spectra [( a ) full range with intensity truncated for the central band; ( c ) central band] for ussingite sample 1 at a spinning rate of 20 kHz, and the respective simulated spectra using parameters in Table 4 ( b and d ).
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29 Si <span class="search-highlight">MAS</span>-<span class="search-highlight">NMR</span> <span class="search-highlight">spectra</span> for <span class="search-highlight">spectra</span> for cristobalite as a function of tempera...

29 Si MAS-NMR spectra for spectra for cristobalite as a function of tempera...

Published: 01 January 2000
Figure 7. 29 Si MAS-NMR spectra for spectra for cristobalite as a function of temperature, across the α-β transition. The chemical shift decreases with increasing temperature in the α-phase and across the α-β transition. A distribution of transition temperatures causes the presence of peaks