Materials Literature
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Rietveld analysis of neutron powder diffraction data on the sanmartinite (ZnWO 4 )-cuproscheelite (CuWO 4 ) solid solution has enabled the comparison of microscopic and macroscopic order parameters associated with the P 2/ c – P \overline 1 structural phase transition. The macroscopic spontaneous strain, calculated fr…
Other| February 01, 1997 Fivefold-coordinated Ti4+ in metamict zirconolite and titanite: A new occurrence shown by Ti K-edge XANES spectroscopy François Farges François Farges Universite de Marne-la-Vallee, Laboratoire de Physique et Mecanique des Geomateriaux, France Search for other works by this author on: GSW Goog…
A surface forces apparatus modified to apply small-amplitude oscillatory displacements in the normal direction was used to measure the drainage of tetradecane (a good solvent) past polybutadiene (PB) brushes end-attached to two opposed mica surfaces. The PB was attached by selective adsorption of the poly(vinylpyridin…
Other| February 01, 1997 The pressure behavior of clinozoisite and zoisite: An X-ray diffraction study Paola Comodi; Paola Comodi Universita di Perugia, Dipartimento di Scienze della Terra, Perugia, Italy Search for other works by this author on: GSW Google Scholar Pier Francesco Zanazzi Pier Francesco Zanazzi Search…
Silicon carbide (SiC) porous substrates, containing alumina (Al 2 O 3 ) dopant levels of 3, 5, and 8 wt%, are prepared by slip casting and sintering in the temperature range of 1450°–1800°C. The linear shrinkage, bulk density, and pore size of the sintered substrate increase as the sintering temperature and the amount…
Novel chemically bonded phosphate ceramics are being developed and fabricated for low‐temperature stabilization and solidification of mixed‐waste streams that are not amenable to conventional high‐temperature stabilization processes because volatiles, such as heavy‐metal chlorides and fluorides, and/or pyrophorics are…
The synthesis and characterization of a novel series of crown ethers based on triethylene glycol (3EO) and the conformationally flexible 1-(4-hydroxy-4‘-biphenylyl)-2-(4-hydroxyphenyl)butane (TPB), i.e. TPB-(c)3EO( z ) (where c stands for cyclic and z = 1−10 is the degree of polymerization (DP) of the cyclic compound)…
Investigations are reported on the dependence of longitudinal ultrasonic attenuation on temperature in tellurite glasses containing vanadium pentoxide with different concentrations. The pulse echo technique was applied at ultrasonic frequencies 2, 4, 6, and 8 MHz, in the temperature range between 100 and 300 K. The re…
An important aspect of the fiber-to-yam production process is the quality of the resulting yarn. The yarn should have optimal product characteristics (and minimal faults). In theory, this objective can be realized using an optimization algorithm. The complexity of a fiber-to-yarn process is very high, however, and no…
Other| February 01, 1997 Coordination of Ti4+ in silicate glasses: A high-resolution XANES spectroscopy study at the Ti K edge François Farges François Farges Universite de Marne-la-Vallee, Laboratoire de Physique et Mecanique des Geomateriaux, France Search for other works by this author on: GSW Google Scholar Americ…
M\"ossbauer spectra of ${\mathrm{Sm}}_{2}$ ${\mathrm{Fe}}_{17}$ and ${\mathrm{Sm}}_{2}$ ${\mathrm{Fe}}_{17}$ ${\mathrm{N}}_{\mathrm{y}}$ in a temperature range between 77 K and the Curie temperature have been studied. The exchange integrals, as a function of the distances between the Fe-Fe pairs, have been found by fi…
Polymorphs and high‐temperature phase transformations of dicalcium silicate (Ca 2 SiO 4 ) are investigated on powdered samples, using Raman scattering techniques. Raman spectra at room conditions of pure γ‐ and β‐Ca 2 SiO 4 and stabilized β‐, α′ L ‐, and α‐Ca 2 SiO 4 are presented in the frequency range of 110–1100 cm…
The transcriptional modulator in the fibroin gene intron is composed of multiple octamer-like AT-rich elements, to which several specific DNA-binding proteins named fibroin-modulator-binding proteins (FMBPs) bind. Three major FMBPs in the silk gland were characterized. Two of them (FMBP-2 and -3) were identified as a…
Antimicrobial activity of irradiated chitosan was studied against Escherichia coli B/r. Irradiation of chitosan at 100 kGy under dry conditions was effective in increasing the activity, and inhibited the growth of E coli completely. The molecular weight of chitosan significantly decreased with the increase in irradiat…
Other| February 01, 1997 Corrensite; A single phase or a mixed-layer phyllosilicate in saponite-to-chlorite conversion series? A case study of Sancerre-Couy deep drill hole (France) Daniel Beaufort; Daniel Beaufort CNRS, Universite de Poitiers, Poitiers, France Search for other works by this author on: GSW Google Scho…
Quantized ZnS particles were prepared and isolated from aqueous solution with a capping agent, thioglycerol. The absorption peak of the particles was located at 259−260 nm, and the diameter was estimated to be 1.5−1.6 nm from X-ray diffractograms. Their excitation energy agrees well with that calculated with the finit…
As metal oxide reduction may be a limiting or otherwise important step in a reaction cycle, a complete description of the kinetics of the reduction can be critical to the successful choice of catalytic material. Unfortunately, such information is often lacking. Such is the case in our attempts to develop a catalytic c…
Abstract Hartstoffe werden im Verschleißschutz von Werkzeugen und Bauteilen wegen ihres hohen abrasiven Verschleißwiderstands eingesetzt, meist als Beschichtung im Schichtdickenbereich von nur einigen μm. Für eine Auswahl des Schichtmaterials sind die physikalischen, mechanischen und technologischen Eigenschaften, die…
The Debye-Waller factors of atoms in Ge, GaN, ZnO, CdS, CdSe, CuBr, CuCl, AgI, CdO, AgBr, KBr and RbCl in order of Phillips ionicity ( f i ) are studied by both EXAFS and the diffraction method. The displacement correlation functions (DCF) are derived from the mean-square relative displacement (MSRD) and the mean-squa…
The Raman spectra of anatase, rutile, and brookite consist of several intense bands, whereas kaolinite has only a weak Raman spectrum. Raman spectra of ten relatively pure kaolin and two halloysite samples that varied significantly in Ti content revealed the presence of anatase but neither rutile nor brookite in all s…