Showing papers in "Materials Letters in 1985"

TL;DR: In this article, a technique to supercritically dry alcogels to transparent silica aerogels at near ambient temperature was described, and the time required for drying was reduced from 2-3 days to 8-10 hours.

TL;DR: In this paper, the effects of self-radiation damage from alpha decay in Gd2Ti2O7 were investigated by studying specimens doped with 244Cm and found that the radiation-induced microstructure consists of individual amorphous tracks from both the alpha-recoil particles and the spontaneous fission fragments.

TL;DR: In this article, the first shock synthesis of nickel aluminides by explosive loading of the blended mixture of elemental nickel and aluminum powders was reported, and the major end product was identified by X-ray diffraction and electron-probe microanalysis.

TL;DR: In this article, a new technique is devised for the preparation of solution-derived titania gel spheres, which may be useful in coating technology by plasma-spraying, by dispersal of the polymerized titanium ethoxide solution into a two-phase liquid suspension in kerosene followed by heating in a microwave oven.

TL;DR: Positron lifetime and Doppler-broadening measurements were performed at room temperature on well-annealed polycrystalline Ni 75− x Al 25+ x alloys ( x = −1, 0, and + 1) containing 0, 100, and 500 wt. ppm boron.

TL;DR: In this article, the role of chemical additives in the dynamics of the sol-gel hydrolysis process was investigated using high-resulution 29 Si NMR, and the results showed that the kinetics of the reaction were strongly dependent upon the viscosity of the system, and consequently upon the additive considered.

TL;DR: The first member of the new series Re6Se4+xCl10 ·x−Re6,Se4Cl10 is described in this article, where the main feature of the single-crystal structure determination is the occurrence of octahedral Re6 clusters included in Re6S4Br10, units.

TL;DR: In this article, the atomic structures of collision cascades in Bi + -implanted silicon were investigated and the formation of subcascades or bunching of the primary cascades was clearly observed.

TL;DR: In this article, a low concentration of Mn (< 005 atom) added to lanthanide-doped ceramics for enhancing the PTC effect did not show any EPR signal due to Mn in the tetragonal phase Above Tc (400 K).

TL;DR: In this paper, the results of a transmission electron microscopy study of the Pd-GaAs reaction are presented, and the first two reaction products are ternary phases of the type M X A III B V (Pd 5 (GaAs) 2 and Pd 4 GaAs) by choosing appropriate metal thicknesses and annealing temperatures.

TL;DR: In this paper, the Knoop microhardness indentation method was used to measure the hardness of renal calculi based on calcium oxalate, calcium phosphate, uric acid, cystine, and magnesium ammonium phosphate.

TL;DR: In this paper, the formation and decomposition of magnesium hydride was studied in the temperature range 610-630 K and at pressures from the equilibrium value to 1.6 MPa.

TL;DR: In this paper, a mixture of α-iron and an essentially amorphous neodymium-rich boron oxide matrix is explained as a decomposition of a glassy phase.

TL;DR: The first growth of epitaxial films of cadmium mercury telluride (CMT) using photolytic metal-organic vapour phase epitaxy (photo-MOVPE) was reported in this article.

TL;DR: In this article, the changes in the Raman spectra of the silica sol-gels have been examined as a function of time, showing that the increase of pressure from 1 bar to 3.5 kbar decreased the gelation time from 168 h down to 6 h.

TL;DR: Tetragonal Fe14La2B (a = 0.883 nm, c = 1.236 nm) is stable below 860°C and has a magnetization approaching 1.1 T in a field of 2000 kA/m.

TL;DR: In this article, the effects of substrate temperature on the structural properties, compositional analysis and electrical resistivity of polycrystalline stoichiometric films of AgGaSe 2 have been studied.

TL;DR: In this paper, the mixing and alloying phenomena of nickel overlayers on silicon carbide induced by nanosecond laser pulses (wavelength 0.248 μm and pulse duration 35 ns) of a krypton fluoride laser were investigated.

TL;DR: In this paper, perlite from Sardinia (Italy), Milos (Greece) and Siberia (USSR) have been evaluated in terms of chemical composition, phase analysis, iron distribution, morphology and thermal properties for application as raw material in zeolite synthesis.

TL;DR: In the presence and absence of Au, very small amounts of Au (as little as 14 A at the Si Co interface) were found to increase the growth rate of CoSi2 dramatically and also caused a decrease in activation energy from 2.3 to 1.2 eV.

TL;DR: Three Si-H IR absorption peaks (2191, 2123, 1894 cm −1 ) observed in as-grown and irradiated FZ-Si crystal containing hydrogen are shown experimentally to be oxygen-related as discussed by the authors.

TL;DR: In this paper, the first bulk oxycarbide glasses were synthesized for the first time by adding SiC to magnesium aluminosilicate glass forming melts, and significant improvements in the glass transition temperature, microhardness, and refractoriness were achieved.

TL;DR: A molecular field analysis of the Yafet-Kittel (YK) spin ordering using a three sublattice model is presented in this paper to explain the experimental data satisfactorily.

TL;DR: In this article, thin films of PtSi and Pd 2 Si were formed by short duration incoherent light exposure of evaporated Pt or Pd films on 〈100〉 Si single crystals, after processing for time intervals of 15 s and temperatures between ≈ 500 and ≈ 800°C.

TL;DR: In this article, a single crystalline, low resistivity ZnSe has been grown on (100) GaAs by atmospheric pressure metal-organic vapour phase epitaxy (MOVPE) using dimethylzinc and hydrogen selenide as reagents.

TL;DR: In this article, the equilibrium relaxation time τe of GeySe1−y bulk amorphous samples was studied for different values of y (0 ⊽ y ⩽ 0.16).

TL;DR: In this paper, the morphology and distribution of phases resulting from the thermal oxidation of GaAs at 500 ° C has been investigated by application of high-resolution transmission electron microscopy to cross-sectioned specimens.

TL;DR: In this article, a simple, flexible, and easy to decontaminate dc sputtering device is described, and some results concerning preparation of thin films of transition metal cluster-built materials are reported.

TL;DR: In this paper, a high-intensity incoherent lamp was used to vacuum anneal the contact zone, which was then characterized for chemical, physical, and electrical properties of the Ni-GaAs interface.

TL;DR: Very fine ( < 100 A) CrMo, W alloy powder particles were produced from a mixture of metal (Cr, Mo, W) carbonyl vapors via laser-induced dielectric breakdown as discussed by the authors.