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magic-angle-spinning spectra

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( a ) Simulated  207 Pb static powder <span class="search-highlight">spectra</span> of pyromorphite with Wyckoff ...
Published: 01 April 2021
Figure 2. ( a ) Simulated 207 Pb static powder spectra of pyromorphite with Wyckoff position 6 h and 4 f shown combined, and ( b ) as separate contributions. ( c ) Simulated 207 Pb magic angle spinning spectra of pyromorphite at 110 kHz, and ( d ) 11 kHz spinning speed, with the isotropic
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27 Al <span class="search-highlight">magic</span> <span class="search-highlight">angle</span> <span class="search-highlight">spinning</span> nuclear magnetic resonance <span class="search-highlight">spectra</span> for Fe-free a...
Published: 01 April 2021
Figure 7. 27 Al magic angle spinning nuclear magnetic resonance spectra for Fe-free allophanes and imogolite. Spectra have been vertically offset for clarity.
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29 Si <span class="search-highlight">magic</span> <span class="search-highlight">angle</span> <span class="search-highlight">spinning</span> nuclear magnetic resonance <span class="search-highlight">spectra</span> for Fe-free a...
Published: 01 April 2021
Figure 8. 29 Si magic angle spinning nuclear magnetic resonance spectra for Fe-free allophanes and imogolite. Spectra have been vertically offset for clarity.
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( A ) Triple-quantum <span class="search-highlight">magic</span>-<span class="search-highlight">angle</span> <span class="search-highlight">spinning</span>  17 O NMR <span class="search-highlight">spectra</span> (9.4 Tesla fiel...
Published: 01 October 2006
FIGURE 2 ( A ) Triple-quantum magic-angle spinning 17 O NMR spectra (9.4 Tesla field) of NaAlSiO 4 glasses prepared with different cooling rates and thus different fictive temperatures. Blue boxes show peaks for different bridging oxygen species. Intensities for the Al-O-Al and Si-O-Si peaks
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( A ) Triple-quantum <span class="search-highlight">magic</span>-<span class="search-highlight">angle</span> <span class="search-highlight">spinning</span>  17 O NMR <span class="search-highlight">spectra</span> (9.4 Tesla fiel...
Published: 01 October 2006
FIGURE 2 ( A ) Triple-quantum magic-angle spinning 17 O NMR spectra (9.4 Tesla field) of NaAlSiO 4 glasses prepared with different cooling rates and thus different fictive temperatures. Blue boxes show peaks for different bridging oxygen species. Intensities for the Al-O-Al and Si-O-Si peaks
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<span class="search-highlight">Magic</span> <span class="search-highlight">angle</span> <span class="search-highlight">spinning</span> nuclear magnetic resonance (MAS NMR) <span class="search-highlight">spectra</span> for  11  ...
Published: 01 May 2000
Fig. 4. Magic angle spinning nuclear magnetic resonance (MAS NMR) spectra for 11 B on a synthetic olenite prepared at 25 kbar, 600°C ( Table 1 ) and on a natural dravite from Dobrava, Slovenia (collection Mineralogisches Institut, Ruhr-Universität Bochum).
Journal Article
Published: 01 November 2009
American Mineralogist (2009) 94 (11-12): 1698–1706.
... and geologic hydrozincite samples, with coherent diffraction domains in the biomineral hydrozincite that are smaller by 30–50% than in the other samples investigated in this study. 13 C magic angle spinning (MAS) and cross polarization magic angle spinning (CPMAS) NMR spectra show more than one peak for all...
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Journal Article
Published: 01 May 2006
American Mineralogist (2006) 91 (5-6): 957–960.
...Jian Feng; Young J. Lee; Richard J. Reeder; Brian L. Phillips Abstract We show that the signal observed in 13 C{ 1 H} cross-polarization magic-angle-spinning (CP/MAS) NMR spectra of synthetic calcite precipitated at room temperature arises from bicarbonate ion. Although this peak occurs at the same...
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Journal Article
Published: 01 October 2012
European Journal of Mineralogy (2012) 24 (6): 991–1004.
... 29 Si nuclear magnetic resonance (NMR) and micro-Raman spectroscopies. 29 Si Single Pulse Excitation Magic Angle Spinning (SPEMAS) spectra show the occurrence of two main sets of peaks, related to Q 2 and Q 3 sites, respectively, confirming the presence of double silicate chains. An additional weak...
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Journal Article
Published: 01 April 2021
American Mineralogist (2021) 106 (4): 541–548.
...Figure 2. ( a ) Simulated 207 Pb static powder spectra of pyromorphite with Wyckoff position 6 h and 4 f shown combined, and ( b ) as separate contributions. ( c ) Simulated 207 Pb magic angle spinning spectra of pyromorphite at 110 kHz, and ( d ) 11 kHz spinning speed, with the isotropic...
FIGURES | View All (8)
Journal Article
Published: 01 May 2018
American Mineralogist (2018) 103 (5): 711–719.
... with 30 mg of KBr and then pressed. Solid-state NMR spectra were collected using a Varian Unity Inova spectrometer with a 9.39 T wide-bore Oxford magnet. 29 Si magic angle spinning (MAS) experiments were performed at a 7 kHz spinning rate with a probe configured for 4 mm Si 3 N 4 rotors. MAS...
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Cross-polarization <span class="search-highlight">magic</span> <span class="search-highlight">angle</span> <span class="search-highlight">spinning</span>  15 N nuclear magnetic resonance sp...
Published: 01 August 2009
F ig . 4. Cross-polarization magic angle spinning 15 N nuclear magnetic resonance spectra of (a) the humic acid reaction product with 15 N-thiazole-labeled 2-aminobenzothiazole (ABT) and the deconvoluted spectrum, (b) humic acid with laccase, and (c) 15 N-thiazole-labeled ABT (* = spinning
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Cross-polarization <span class="search-highlight">magic</span> <span class="search-highlight">angle</span> <span class="search-highlight">spinning</span>  15 N nuclear magnetic resonance sp...
Published: 01 August 2009
F ig . 2. Cross-polarization magic angle spinning 15 N nuclear magnetic resonance spectra of (a) the humic acid reaction product with 15 N-amino-labeled 2-aminobenzothiazole (ABT) and the deconvoluted spectrum, (b) humic acid with laccase, and (c) 15 N-amino-labeled ABT (* = spinning side
Journal Article
Published: 01 September 2006
European Journal of Mineralogy (2006) 18 (5): 641–651.
... at B 0 = 9.4 T (v 0 = 104.263 MHz, v 0 = 400.13 MHz and v 0 = 376.49 MHz). Single-pulse magic-angle spinning spectra were obtained on a Bruker MAS probe, with a 7-mm ZrO 2 rotor for 29 Si experiment and a 4-mm rotor for 27 Al and 19 F. Acquisitions parameters are summarized in Table 3 . The 29...
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Journal Article
Published: 01 May 2018
American Mineralogist (2018) 103 (5): 776–791.
... compositions. For all of these phases, NMR peak broadening is large, in many cases to the point where magic angle spinning (MAS) does not enhance resolution; in all cases the observed paramagnetic shifts fall far outside the known range for diamagnetic silicates. There are clearly large effects of local...
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Journal Article
Published: 01 April 2006
Clays and Clay Minerals (2006) 54 (2): 252–265.
... of the distribution of Si and Al in the tetrahedral sheets requires that the various Q 3 ( m Al) peaks are resolved in the 29 Si spectrum. This is usually not a problem for highly ordered silicates, from which 29 Si peak widths in magic-angle spinning (MAS) spectra are typically <3 ppm. Unfortunately, from...
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Journal Article
Published: 01 January 2012
American Mineralogist (2012) 97 (1): 203–211.
...Steven M. Chemtob; George R. Rossman; Jonathan F. Stebbins Abstract Natural and synthetic hydrous amorphous silicas were investigated with single-pulse 29 Si magic angle spinning (MAS) NMR and with vibrational spectroscopic methods. Samples included a volcanically derived silica coating on young...
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Carbon-13 direct polarization with <span class="search-highlight">magic</span>-<span class="search-highlight">angle</span>-<span class="search-highlight">spinning</span> nuclear magnetic re...
Published: 01 March 2013
Figure 2 Carbon-13 direct polarization with magic-angle-spinning nuclear magnetic resonance spectra of oil shale using a recycle delay of 20 s (A) and 1 s (B). Chemical shift is reported in parts per million (ppm).
Journal Article
Published: 01 October 2000
The Canadian Mineralogist (2000) 38 (5): 1201–1213.
...Barbara L. Sherriff; Elena V. Sokolova; Yurii K. Kabalov; David M. Jenkins; Gerald Kunath-Fandrei; Steffen Goetz; Christian Jäger; Julius Schneider Abstract Rietveld structure refinement, 29 Si magic angle spinning (MAS) and 27 Al satellite transition (SATRAS) NMR spectroscopic data are given...
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Journal Article
Journal: Clay Minerals
Published: 01 September 2003
Clay Minerals (2003) 38 (3): 259–278.
...-Quantum (MQ) Magic-Angle Spinning (MAS) NMR spectroscopy has been a step-change development to the studies of quadrupolar nuclei in solids. It is now possible to record high-resolution spectra of important nuclei, such as 11 B, 17 O, 23 Na, 27 Al and 69,71 Ga, in synthetic and natural clays. Since its...
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