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Preliminary X-ray, SEM, TEM, and optical mineralogical results are reported to discuss the paragenesis, age distribution,and origin of clay minerals, silica modifications and authigenic silicates foun...
Studies were conducted on the production of silane modified kaolinite/silica core-shell nanoparticles (SMKS). The SMKS nanoparticles were prepared via the sol–gel technique using tetraethyl oxysilane ...
Water vapor adsorption on silica gel was investigated using Tian–Calvet-type microcalorimetry. Differential heat of adsorption data was obtained. The setup of microcalorimetry was used volumetric syst...
New composites with improved thermal stability, mechanical and dielectric properties were developed, which consist of 2,2!-diallylbisphenol A (DBA)/4,4!-bismaleimidodiphenylmethane (BDM) resin and a n...
We present the discovery of a novel dense silica polymorph retrieved from shock-wave and diamond-anvil cell experiments. This polymorph is the first observed silicate composed of face-sharing polyhe...
X-ray absorption measurements on Kr dissolved homogeneously in vitreous silica (1.97 wt% Kr) have been carried out at the Kr K-edge at 4.5 K, representing the first direct determination of the sites ...
Theviscositiesofhydrousmelts(0.65to2.8wt%H O)withquartzofeldspathiccom-2 Qz ,andAb Qz (moleproportionscalculatedonthe positionscorrespondingtoAb,Ab 74 26 48 52 basisofeightoxygenatoms;Ab NaAlSi O ...
A new polymorph of phosphorus oxynitride (PON) a silica analog has been recovered at ambient pressure by quenching after a treatment at 850 ?C under a pressure of 2.5 GPa using cristobalite- or quar...
Kanzaki et al. (1997) argue that SBAD structure cannot beand baddeleyiteonsidered to be intermediate between ?-PbO2 at highstructures. The similarity between SBAD and ?-PbO2pressure was emphasized by ...
Belonoshko et al. (1996) argued that they found a new high-pressure silica phase (which they denoted SBAD) with spacegroup Pnc2 from molecular dynamics (MD) simulations. How-ever, we noticed that a si...
Abstract: A comparative study is reported in which kaolinite has been hydrothermally synthesized at several pH conditions. The syntheses were carried out at 220 亱C for 3 to 10 d with distilled water o...
Amolecular dynamics study withanalytical and ab initio interatomic potentials revealed the possibility of a new silica phase withPnc2 structure, which is more stable than sti-shovite and its CaCl2-lik...
Assignmentofthe peaksnear485em-I in vibrational spectra ofSi02-M7;:;Al02(where M=an alkali oralkaline earth element) glassesto v,(T-O-T) modesin four-membered rings wastested withmolecularorbital cal...
Oxygen isotope composition of three types of unique nodules which consist of amorphous silica-apatite, cristobalite-apatite and tridymite-apatite associations interspersed amidst basaltic pyroclastics...

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