Materials Literature
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The etch rates of anodic oxides in dilute fluoride solutions have been determined by using a new approach to the analysis of anodic current oscillations. The variation of the thickness of the anodic oxide with time has been measured by in situ Fourier transform infrared spectroscopy. The change in oxide thickness can…
Weakly agglomerated nanocrystalline (ZrO2)0.92(Y2O3)0.08 − x(Sc2O3)x (x = 0–0.08) powders (8.4–9.9 nm in size) in a cubic structure with high surface area (145–153 m2 g−1) were synthesized by a two-step hydrothermal process in the presence of urea: a stock solution of metal nitrates and urea was heated at 80 °C for 24…
This work was carried out to prevent the rolled-in defects originated from the roll surface deterioration through the investigation of the effect of the thermal fatigue property of hot strip mill work roll materials on the roll surface deterioration and subsequent surface defects in the cold-rolled ultra-low carbon st…
Phase formation processes at T = 350–1000°C in Lu(Gd)-Ti-O samples obtained by co-precipitation method are studied. Thermal processing of freeze dried co-precipitation products results in formation of Lu2Ti2O7 with fluorite structure at 650°C. The phase transition of fluorite to pyrochlore occurs at 750–800°C. At T >…
Gallium sulfide glasses were prepared in the RS-Ga2S3 (R=Ca, Sr, Ba) systems. Respective glass forming regions are 67.5-70.0 mol% CaS, 63.8-68.8 mol% SrS and 60.0-73.8 mol% BaS. Transmission spectra in the visible region, refractive index and glass transition and onset crystallization temperatures were measured for re…
Acoustic and dielectric properties of deuterated betaine arsenate (DBA), betaine phosphite (BPI) and glycine phosphite (GPI) have been studied in the vicinity of ferroelectric, antiferroelectric and improper ferroelastic phase transitions. The temperature dependences of the velocity and attenuation of acoustic waves a…
The mechanism of leakage current of porous organosilicate glass (POSG) with plasma ashing is investigated. The plasma ashing often deteriorates the POSG film, causing moisture uptake. We find that the leakage-current mechanism of POSG transforms from Schottky emission into ionic conduction after plasma treatment. The…
Several liquid crystalline compounds derived from 2-aminonaphthalene have been synthesized. The molecules are designed to accommodate two napthalene moieties. The molecular structures of these new compounds have been characterized by element analysis, FTIR, and NMR spectral studies. The mesomorphic behavior has been s…
By using the FAST system, a range of lightweight wool and wool-blend fabrics, including three wool fabrics treated with Synthappret BAP shrinkproofing resin to obtain machine-washable properties, was investigated in terms of tailorability. The main problems with these fabrics were found to be their low warp extensibil…
Adsorption of CO on Pd/WO3-ZrO2 sample at 85 K results in formation of carbonyls typical of the support as well as of Pd3+-CO species (2212 cm−1). The latter are masked by the strong Zr4+-CO band. Even at 90 K the Pd3+ sites are reduced to Pd2+ (the respective carbonyls absorbing at 2184 cm−1) and, at higher temperatu…
The composition-property relationships of LDPE-PP binary blends have been investigated. Young's modulus, yield strength and flexural strength of the blends varied monotonically with composition, whereas the elongation at failure and the true ultimate tensile strength for the blends with 30-50 wt-% PP exhibited synerge…
Polycrystalline ceramics of SmBi 3 Ti 3 O 12 were prepared by the solid state reaction method. Extensive impedance studies were carried out on these samples. From the measurements, it was observed, that low concentrations of a rare earth substituent for the bismuth site showed broad dielectric and impedance peaks. Fer…
Recent applications of infrared and Raman spectroscopy in the study of the metamict (or "amorphized") state, high-temperature recrystallization and radiation-induced OH species in natural zircon (ZrSiO4) and titanite (CaTiSiO5) are reviewed.
The thermal conductivity of a range of materials has been measured by a transient needle probe technique. These include graphite, Perspex, AFS testing sand, and silica microspheres. Particular attention is paid to measurement on powders, for which packing density is important. This work forms part of an NPL project to…
Two cladding methods for NdFeB powders, i.e., the modified organic silicon (MOS) cladding and the dichromate passivation reducing (DPR) cladding are exploited respectively for the preparation of polymer-bonded magnet and metal-bonded magnet. The effects of their cladding conditions and coating compositions, together w…
Mesoporous Ta oxide with a pore size of ca. 22 Å and a BET surface area of 486 m2 g−1 was reduced by bis(toluene)Ti in the presence of dinitrogen and the product characterized by XPS, XRD, elemental analysis, nitrogen absorption, and variable temperature conductivity measurements. The XPS spectrum shows three differen…
The aqueous phase interaction of divalent Sr with silicate-containing solutions was studied over a range of pH values, dissolved silica, and Sr concentrations, and extending to basic solution (0.2 M NaOH) at room temperature (22-23°C). Formation of an amorphous Sr silicate phase of variable composition was observed, b…
THE BEHAVIOR OF POLY-VINYLIDENE FLUORIDE (PVDF) UNDER BOMBARDMENT OF DIFFERENT KINDS OF RADIATION IS OF INTEREST DUE TO THE POLYMER'S UNIQUE PIEZO-ELECTRIC PROPERTIES AND VARIOUS CRYSTALLINE FORMS. IN THIS WORK, PVDF FILM SAMPLES OF 0.3 MM THICKNESS AND DENSITY 1.76 G/CM3 WERE IRRADIATED WITH 4 MEV PROTONS FROM THE IN…
Se estudió el efecto del quitosano aplicado como recubrimiento sobre la calidad postcosecha de la mandarina ‘Fortune’. Las mandarinas fueron enceradas con una solución acuosa de quitosano al 0,6 ó 1,25% y almacenadas a 20ºC durante 15 días simulando la comercialización. Como control se utilizó una cera comercial de po…
Proceedings of the 11th International Symposium, 7-9 October 2002, Columbus, Ohio. This proceedings volume includes papers covering a broad selection of topics related to advanced materials processing and fabrication. Contents: Superconducting, magnetic, and other functional materials; Hydrogen storage materials; Inte…