Results 261 to 270 of about 5,514 (291)

Incorporation of aluminum into silicate anions in aqueous and methanolic solutions of TMA silicates

The Journal of Physical Chemistry, 1991
{sup 29}Si and {sup 27}Al NMR spectroscopies were used to characterize dilute, highly alkaline, aqueous and methanolic solutions of tetramethylammonium (TMA) aluminosilicates. The solutions contained 2 mol% SiO{sub 2}, a silicate ratio (R=(SiO{sub 2})/(M{sub 2}O), M{sup +} = TMA{sup +}) of 2, Si/Al molar ratios between {infinity} and 2, and between 0 ...
Clayton J. Radke, R. F. Mortlock, Alexis T. Bell   +2 more
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Silicon Substitution for Aluminum in Calcium Silicate Hydrates

Journal of the American Ceramic Society, 1999
27Al MAS and multiquantum (MQ) MASNMR (magic‐angle spinning nuclear magnetic resonance) spectroscopy were used to study the substitution of silicon by aluminum in calcium silicate hydrates (C‐S‐H), which are the main component of hydrated portland cement. Synthetic C‐S‐H samples were prepared, and their chemical stability was studied.
P. Faucon, Fredéric Adenot, J. François Jacquinot, J. Claude Petit, Thibault Charpentier   +4 more
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Incorporation of aluminum and iron into siliceous sinters

Chemical Geology, 1970
Abstract The water content of siliceous sinters deposited from the same thermal water can be expressed in terms of their SiO2 and Me2O3 (Me = Al and Fe) contents: ( H 2 O )=0.13(SiO 2 ) + 7.6( Me 2 O 3 The content of each constituent being given in m-moles/g, this equation means that each metallic atom is linked by
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Reaction of an aluminum silicate coating with some metals

Soviet Powder Metallurgy and Metal Ceramics, 1973
1. The method of electron beam vaporization of rods prepared from synthetic mullite can be successfully used for the deposition of vitreous aluminum silicate coatings with a composition close to that of mullite on metallic surfaces. 2. The method of infrared spectroscopy makes it possible to determine qualitatively the phase composition ...
V. M. Grosheva, S. P. Listovnichaya, V. Ya. Aivazov, E. M. Parakhina, D. M. Karpinos   +4 more
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Fibrous ceramic aluminum silicate as an alternative to asbestos liners

The Journal of Prosthetic Dentistry, 1980
The actual risk to those exposed to asbestos fibers in the dental laboratory is presently unknown. The ADA Council on Dental Materials and Devices and ADA Council on Dental Therapeutics have received encouragement from the National Institute for Occupational Safety and Health to conduct further studies, including monitoring airborne asbestos in dental ...
George Priest, Jack A. Horner
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Effect of aluminum sulfate on the hydration of tricalcium silicate

Construction and Building Materials, 2019
Abstract In order to obtain a deep understanding of the hydration of sprayed concrete, C3S pastes with and without aluminum sulfate (AS) were comparatively investigated. The results showed that AS significantly accelerated the hydration of C3S and refined the pore structure of the hardened C3S paste, by reacting with the calcium ions to produce ...
Hongbo Tan, Maogao Li, Jun Ren, Xiufeng Deng, Xun Zhang, Kangjun Nie, Junjie Zhang, Zhuqing Yu   +7 more
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Reactions in Eucryptite‐Based Lithium Aluminum Silicates

Journal of the American Ceramic Society, 2010
The reaction sequence to synthesize β‐eucryptite, LiAlSiO4, from the raw ingredients SiO2, Li2CO3, and Al2O3 was studied using thermal analysis and X‐ray diffraction techniques. Reactions were examined by heating the raw ingredients as two‐component and three‐component mixtures in air, then cooling for phase analysis. In some cases, cyclic heating was
Timothy Jochum, Ivar E. Reimanis
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Crystallization kinetics of the aluminum silicate glass fiber

Materials Science and Engineering: A, 1999
Abstract The crystallization behavior and kinetics of aluminum silicate glass fiber (Al2O3 79 wt.%) have been investigated using a non-isothermal DTA method. The precipitation phase of the aluminum silicate glass fiber is mullite, the glass transformation temperature is 1451∼1472 K, the crystallization reaction begins to occur from 1516∼1536 K, and ...
Li Rongti, Pan Wei
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Complicated effects of aluminum on the compressibility of silicate perovskite

Physics of the Earth and Planetary Interiors, 2004
Abstract The effect of alumina content on the compressibility of MgSiO3 perovskite was studied using both diamond-anvil and multi-anvil techniques. Hydrostatic compressions were performed on MgSiO3 perovskites using helium as a pressure-transmitting medium up to 33 GPa.
Norimasa Nishiyama, Atsushi Kubo, Takehiko Yagi, Takumi Kikegawa, Kouichi Okabe   +4 more
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The Crystal Structures of the Aluminum-Silicate Feldspars

1994
The vast array of crystal structure refinements, lattice parameter measurements, optical and spectroscopic data, and electron microscopic observations accumulated on feldspar since W. H. Taylor unravelled the sanidine structure in 1933 has led to detailed understanding of many but by no means all of the diffusive and displacive transformations ...
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