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hydroxylapophyllite

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Journal Article

Radiation-induced defects in apophyllites. II. An O − centre and related O − –O − pairs in hydroxylapophyllite Available to Purchase

Mao Mao, Mark J. Nilges, Yuanming Pan
Published: 01 January 2010
European Journal of Mineralogy (2010) 22 (1): 89–102.
DOI: https://doi.org/10.1127/0935-1221/2009/0021-1974
...Mao Mao; Mark J. Nilges; Yuanming Pan Abstract A hole-like centre present in natural hydroxylapophyllite without any artificial irradiation has been investigated by single-crystal and powder electron paramagnetic resonance (EPR) spectroscopy at 290 K and 90 K, and by three-pulse electron spin echo...
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Projection of the hydroxylapophyllite structure on the (100) plane illustrating alternating Si8O20 sheets and K,Ca sheets (data from Rouse et al., 1978). Note that the hydroxyl group is located at 0,0,0.

Projection of the hydroxylapophyllite structure on the (100) plane illustra... Available to Purchase

Published: 01 January 2010
Fig. 1. Projection of the hydroxylapophyllite structure on the (100) plane illustrating alternating Si 8 O 20 sheets and K,Ca sheets (data from Rouse et al ., 1978 ). Note that the hydroxyl group is located at 0,0,0.
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The positions of the hydroxyl oxygen atoms in the hydroxylapophyllite structure (cf. Rouse et al., 1978) illustrating five possible O−–O− pairs: I, II, III and IV correspond to those in Tables 3 and 5. V is predicted to have a smaller splitting (Table 5), which is not detectable in EPR spectra.

The positions of the hydroxyl oxygen atoms in the hydroxylapophyllite struc... Available to Purchase

Published: 01 January 2010
Fig. 9. The positions of the hydroxyl oxygen atoms in the hydroxylapophyllite structure ( cf . Rouse et al. , 1978 ) illustrating five possible O − –O − pairs: I, II, III and IV correspond to those in Tables 3 and 5 . V is predicted to have a smaller splitting (Table 5 ), which
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Stacked plots of the 29Si portion of the experimental and simulated three-pulse, Fourier-transform ESEEM spectra of the O− center in hydroxylapophyllite as a function of rotation angles. Spectral simulations included 2 Si nuclei. Intensity in the vertical axis unlabeled (arbitrary unit; modified from Mao et al. 2010b).

Stacked plots of the 29 Si portion of the experimental and simulated three... Available to Purchase

Published: 01 January 2014
Figure 11 Stacked plots of the 29 Si portion of the experimental and simulated three-pulse, Fourier-transform ESEEM spectra of the O − center in hydroxylapophyllite as a function of rotation angles. Spectral simulations included 2 Si nuclei. Intensity in the vertical axis unlabeled (arbitrary
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Room-temperature powder EPR spectra (microwave frequency = 9.38 GHz) of hydroxylapophyllite before and after isochronal annealing show that the O− centre starts to decrease in intensity at 225 °C and is bleached at 300 °C. The spectrum of the thermally bleached sample after a ~32 kGy gamma-ray irradiation shows ~80 % restoration of the O− centre.

Room-temperature powder EPR spectra (microwave frequency = 9.38 GHz) of hyd... Available to Purchase

Published: 01 January 2010
Fig. 4. Room-temperature powder EPR spectra (microwave frequency = 9.38 GHz) of hydroxylapophyllite before and after isochronal annealing show that the O − centre starts to decrease in intensity at 225 °C and is bleached at 300 °C. The spectrum of the thermally bleached sample after a ~32 kGy
Journal Article

Radiation-induced defects in apophyllites. I. The NH 2 free radical in fluorapophyllite Available to Purchase

Mao Mao, Yuanming Pan
Published: 01 April 2009
European Journal of Mineralogy (2009) 21 (2): 317–324.
DOI: https://doi.org/10.1127/0935-1221/2009/0021-1902
... ; Allard et al. , 2003 ), is better resolved in a sample of hydroxylapophyllite and will be dealt with in a subsequent contribution. A sample of short prismatic fluorapophyllite crystals of ~ 1–2 mm long on the cavity walls in a phonolite (North Bohemia, Czech), from the University of Saskatchewan...
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Journal Article

Electron Paramagnetic Resonance Spectroscopy: Basic Principles, Experimental Techniques and Applications to Earth and Planetary Sciences Available to Purchase

Yuanming Pan, Mark J. Nilges
Published: 01 January 2014
Reviews in Mineralogy and Geochemistry (2014) 78 (1): 655–690.
DOI: https://doi.org/10.2138/rmg.2014.78.16
...Figure 11 Stacked plots of the 29 Si portion of the experimental and simulated three-pulse, Fourier-transform ESEEM spectra of the O − center in hydroxylapophyllite as a function of rotation angles. Spectral simulations included 2 Si nuclei. Intensity in the vertical axis unlabeled (arbitrary...
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Iron pairs in beryl: New insights from electron paramagnetic resonance, synchrotron X-ray absorption spectroscopy, and ab initio calculations Available to Purchase

Jinru Lin, Ning Chen, Dan Huang, Yuanming Pan
Published: 01 October 2013
American Mineralogist (2013) 98 (10): 1745–1753.
DOI: https://doi.org/10.2138/am.2013.4472
... . Mao M. Nilges M.J. Pan Y. ( 2010 ) Radiation-induced defects in apophyllites. II. An O − centre and related O − -O − pairs in hydroxylapophyllite . European Journal of Mineralogy , 22 , 89 – 102 . Mashkovtsev R.I. Haworth D.F. Weil J.A. ( 2007 ) Biradical states...
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Journal Article

Single-crystal EPR and ENDOR study of an Al—O − center in prehnite: implications for aluminum-associated oxyradicals in layer silicates Available to Purchase

Mao Mao, Mark J. Nilges, Yuanming Pan
Published: 01 June 2010
European Journal of Mineralogy (2010) 22 (3): 381–392.
DOI: https://doi.org/10.1127/0935-1221/2010/0022-2023
... ): Radiation-induced defects in apophyllites. II. An O − centre and related O − —O − pairs in hydroxylapophyllite . Eur. J. Mineral ., 22 , 89 – 102 . Meads , R.E. & Malden , P.J. ( 1975 ): Electron spin resonance in natural kaolinites containing Fe 3+ and other transition metal ions...
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Journal Article

Theoretical calculations of [AlO 4 / M + ] 0 defects in quartz and crystal-chemical controls on the uptake of Al Available to Purchase

S. M. Botis, Yuanming Pan
Published: 01 August 2009
Mineralogical Magazine (2009) 73 (4): 537–550.
DOI: https://doi.org/10.1180/minmag.2009.073.4.537
.... ( 2009 ) Radiation-induced defects in apophyllites. II. An O - center and related O - -O - pairs in hydroxylapophyllite . European Journal of Mineralogy (in press). Merawa , M. , Labeguerie , P. , Ugliengo , P. , Doll K. and Dovesi R. ( 2004 ) The structural, electronic...
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