@article {946,
	title = {Aluminum phosphates derived from alumina and alumina-sol-gel systems},
	journal = {Journal of the American Ceramic Society},
	volume = {87},
	number = {11},
	year = {2004},
	note = {ISI Document Delivery No.: 880XRTimes Cited: 2Cited Reference Count: 25},
	month = {Nov},
	pages = {2064-2071},
	type = {Article},
	abstract = {Aluminum phosphate products formed by the reactions of alumina and alumina-gel systems with acidic phosphates were analyzed. Drying of alumina-gel to form microcrystalline boehmite and conversion to gamma-alumina by thermal treatment was indicated by the appearance of octahedral, pentacoordinate, or tetrahedral sites, which were established using Al-27 magic-angle-spinning solid-state nuclear magnetic resonance spectroscopy. Crystalline aluminum phosphate products and amorphous material were identified using this technique. alpha-alumina and heat-treated alumina-gel that were reacted with phosphate in an Al:P ratio of 1:1 yielded dramatically different aluminum orthophosphate: aluminum metaphosphate product ratios of 8.2:1 and 1:1.1, respectively. When alumina-gel was heat-treated with phosphate, an abundance of aluminum orthophosphate, aluminum metaphosphate, and hydrated aluminum phosphate products were affected by varying conditions of temperature and time of heat treatment and by the amount of phosphate present. An alpha-alumina/alumina-gel composite sol-gel phase that was reacted with phosphoric acid (H,PO,) in a Al:P ratio of 1:1 exhibited an increased quantity of aluminum metaphosphate products compared with an alpha-alumina:H3PO4 ratio of 1:1 and a higher percentage of reaction (79\%) compared with the reactions of an alpha-alumina:H3PO4 ratio of 1:1 or an alumina-gel:H3PO4 ratio of 1:1. The morphologies of aluminum triphosphate hydrate and aluminum metaphosphate product phases were observed using scanning electron microscopy.},
	keywords = {AL-27, COMPOSITE, P-31, PHOSPHORIC-ACID},
	isbn = {0002-7820},
	url = {<Go to ISI>://000225824000010},
	author = {Moorlag, C. and Yang, Q. Z. and Troczynski, T. and Bretherton, J. and Fyfe, C.}
}
@article {611,
	title = {Influence of F content on the composition of Al-rich synthetic phlogopite: Part 1. New information on structure and phase-formation from Si-29, H-1, and F-19 MAS NMR spectroscopies},
	journal = {American Mineralogist},
	volume = {88},
	number = {1},
	year = {2003},
	note = {ISI Document Delivery No.: 635DVTimes Cited: 6Cited Reference Count: 27},
	month = {Jan},
	pages = {47-53},
	type = {Article},
	abstract = {The influence of F content on the formation and stability of Al-rich phlogopite has been investigated. Samples with varying OH/F-ratios and nominal gel compositions of K(Mg3-xAlx)(Al1+xSi3-xO10)(OH)(y) (F)(2-y) (0.0 less than or equal to x less than or equal to 0.8 and 0.5 less than or equal to y less than or equal to 1.8) were studied using Si-29, H-1, and F-19 MAS NMR spectroscopies, powder X-ray diffraction, electron-probe microanalysis, and scanning electron microscopy. The synthetic phlogopites were synthesized from sol-gels in cold-seal pressure vessels at 1073 K, 2 kbar. The main phase (phlogopite) and three other impurity phases [corundum (alpha-Al2O3), kalsilite (KAlSiO4), and potassium aluminum hexafluoride (K3AlF6.0.5H(2)O)] were clearly identified by powder X-ray diffraction and electron-probe microanalysis. For phlogopite, the unit-cell parameters a(0) and b(0) decrease whereas c(0) increases with increasing Al-content (x). The average crystal size of phlogopite is about 1-2 mum. The Si-29 MAS NMR spectra show up to four resonances at approximately -91,-87, -83, and -80ppm, which can be assigned as Q(3)(nAl) signals with n = 0 - 3. The ideal Si/Al-IV ratio calculated from the initial composition is always lower than that derived experimentally. Hydroxyl-rich compositions indicate an increased Al-content in the tetrahedral sheets, suggesting a stabilizing effect on the formation of Al-rich phlogopite. These conclusions are supported by H-1 and F-19 MAS NMR spectra. The H-1 MAS NMR spectra show a water signal at 4.7 ppm, a signal due to Mg2AlOH at 1.8 ppm, and a signal due to Mg3OH at 0.7 ppm. The F-19 MAS NMR spectra exhibit a signal for Mg2AlF at -150 ppm, one due toAlF(6) (K3AlF6.0.5H(2)O) at -157 ppm, and one for Mg3F at -174 ppm. Comparison of the H-1 and F-19 MAS NMR spectra for different Al- and F- contents reveals a non-statistical distribution of F- and OH-groups at the crystallographic sites in the octahedral sheets where F prefers sites coordinated by three Mg, and OH sites with Al in the next-nearest coordination sphere.},
	keywords = {AL-27, FLUORINE, GLASSES, GRANITES, KALSILITE, KALSIO4, NUCLEAR-MAGNETIC-RESONANCE, PETROGENESIS, SILICATE MELTS, SOLUBILITY},
	isbn = {0003-004X},
	url = {<Go to ISI>://000180383600006},
	author = {Fechtelkord, M. and Behrens, H. and Holtz, F. and Fyfe, C. A. and Groat, L. A. and Raudsepp, M.}
}
@article {3976,
	title = {1D and 2D solid state NMR investigations of the framework structure of As-synthesized AlPO4-14},
	journal = {Solid State Nuclear Magnetic Resonance},
	volume = {9},
	number = {2-4},
	year = {1997},
	note = {ISI Document Delivery No.: YU021Times Cited: 46Cited Reference Count: 21},
	month = {Dec},
	pages = {97-106},
	type = {Article},
	abstract = {The framework structure of As-synthesized ALPO(4)-14 has been investigated with a combination of different one-dimensional Al-27 and P-31 solid State NMR techniques and Al-27/P-31 double resonance methods. The results are found to be fully consistent with the assumed structural model. Al-27 MAS and DOR experiments at three different magnetic field strengths together with simulations show the presence of two tetrahedral sites, one pentacoordinated and one octahedral aluminum site. The Al-27 quadrupolar coupling constants and the P-31 isotropic chemical shifts of the tetrahedral sites correlate well with tetrahedral shear-strain parameters and mean P-O-Al bond angles, respectively. These correlations allow one to assign all of the NMR resonances to specific T-sites in the proposed framework structure. The assignments are then further confirmed by the application of three different two-dimensional heteronuclear correlation methods (i.e., Al-27 {\textendash}> P-31 TEDOR, CP, and INEPT) which reveal the connectivities between AlOx and PO4 polyhedra. The two-dimensional INEPT experiment is applied here for the first time in the solid state. (C) 1997 Published by Elsevier Science B.V.},
	keywords = {AL-27, Al-27 nuclear magnetic resonance spectroscopy, aluminophosphate, ANGLE, double resonance, MOLECULAR, MOLECULAR-SIEVE VPI-5, NUCLEI, P-31 NMR, P-31 nuclear magnetic, QUADRUPOLAR, RESOLUTION, resonance spectroscopy, sieve, SPIN},
	isbn = {0926-2040},
	url = {<Go to ISI>://000071671900004},
	author = {Fyfe, C. A. and Altenschildesche, H. M. Z. and Wong-Moon, K. C. and Grondey, H. and Chezeau, J. M.}
}
@article {3337,
	title = {STRUCTURAL INVESTIGATIONS OF SAPO-37 MOLECULAR-SIEVE BY COHERENCE-TRANSFER AND DIPOLAR-DEPHASING SOLID-STATE NUCLEAR-MAGNETIC-RESONANCE EXPERIMENTS},
	journal = {Microporous Materials},
	volume = {5},
	number = {1-2},
	year = {1995},
	note = {ISI Document Delivery No.: TD675Times Cited: 16Cited Reference Count: 21},
	month = {Oct},
	pages = {29-37},
	type = {Article},
	abstract = {In this work, dipolar-based coherence-transfer and dipolar-dephasing solid-state nuclear magnetic resonance (NMR) experiments were performed to investigate the structure of the silicoaluminophosphate molecular sieve SAPO-37. The Al-27,Si-29 transferred-echo double-resonance (TEDOR) experiment directly proves, for the first time, that silicon substitutes for phosphorus atoms in the framework via the SM2 mechanism. The Al-27 (P-31) and Al-27 (Si-29) dipolar-dephasing difference experiments and the two-dimensional Al-27{\textendash}>P-31 TEDOR experiment indicate the presence of three types of aluminum environments: tetrahedral Al surrounded by symmetrical [4P] or [4Si] environments which give rise to a sharp resonance, tetrahedral Al surrounded by asymmetrical [3P, Si], [2P, 2Si] or [P, 3Si] environments which give rise to a broad resonance, and also extra-framework amorphous octahedral Al.},
	keywords = {AL-27, COHERENCE-TRANSFER, DIPOLAR-DEPHASING, NMR, QUADRUPOLAR, SAPO-37 MOLECULAR SIEVE, SILICOALUMINOPHOSPHATE, TRANSFERRED-ECHO DOUBLE-RESONANCE, VPI-5},
	isbn = {0927-6513},
	url = {<Go to ISI>://A1995TD67500004},
	author = {Fyfe, C. A. and Wongmoon, K. C. and Huang, Y. and Grondey, H.}
}
@article {7238,
	title = {COHERENCE TRANSFER INVOLVING QUADRUPOLAR NUCLEI IN SOLIDS - AL-27-REVERSIBLE-ARROW-P-31 CROSS-POLARIZATION NMR IN THE MOLECULAR-SIEVE VPI-5},
	journal = {Journal of the American Chemical Society},
	volume = {114},
	number = {14},
	year = {1992},
	note = {ISI Document Delivery No.: JB980Times Cited: 57Cited Reference Count: 36},
	month = {Jul},
	pages = {5876-5878},
	type = {Note},
	keywords = {AL-27, ANGLE, ECHO DOUBLE-RESONANCE, HIGH-RESOLUTION NMR, MAGIC, MAGNETIC-RESONANCE, PROTON, SPECTROSCOPY},
	isbn = {0002-7863},
	url = {<Go to ISI>://A1992JB98000069},
	author = {Fyfe, C. A. and Grondey, H. and Mueller, K. T. and Wongmoon, K. C. and Markus, T.}
}
