Showing papers in "Materials Research Bulletin in 2001"

TL;DR: In this paper, a topological approach based on analysis of atomic size distributions has been developed and applied to multicomponent amorphous alloys with different glass-forming ability.

TL;DR: In this paper, it was shown that pure spinel NiFe 2 O 4 nanoparticles with a diameter of 5∼30 nm and a specific surface area of 20.0∼55.2 m 2 /g could be produced by calcining the gel precursors with various molar ratios of polyacrylic acid (PAA) to total metal ions (0.5∼2.0) in air at 300°C for 2h.

TL;DR: In this article, an interpretation based on an adiabatic flame temperature, for different fuel-to-oxidant ratios, has been proposed for the nature of combustion and its correlation with the powder characteristics.

TL;DR: In this paper, the apatite-type lanthanum silicates, La 10 (SiO 4 ) 6 O 3 and La 9.33 6 O 2, were synthesized via a sol-gel process.

TL;DR: In this paper, the influence of preparation conditions on the optical absorption, in the spectral range of 280-1260 nm, was investigated for thin Bi2O3 thin films.

TL;DR: In this article, the effect of B 2 O 3 addition on the microwave dielectric properties and the microstructures of 0.95MgTiO 3 -0.05CaTiO3 ceramics were investigated.

TL;DR: In this paper, ascorbic acid was used to increase the tensile strength and elongation properties of the composite polybioploymer composite films of κ-carrageenan and chitosan.

TL;DR: In this article, transparent anatase TiO2 nanometer thin films were prepared via the sol-gel method on soda-lime glass, and then the as-prepared TiO 2 films were treated in HCl solution.

TL;DR: In this article, a peak formed at 430-450 nm in the UV/VIS-spectra resulted from the surface plasma resonance of the silver nanoparticles, and the peak position of the surface resonance also shifted to a high wavelength.

TL;DR: In this paper, a Bi 2 S 3 nanorod with a diameter of 10 nm and a length of up to 300 nm was successfully prepared from a formaldehyde solution of bismuth nitrate and thiourea by microwave irradiation.

TL;DR: In this paper, a simple solution growth route has been employed to synthesize nanocrystalline cobalt oxide thin films on glass substrates, which were characterized by X-ray diffraction and FTIR spectroscopy.

TL;DR: In this article, the synthesis of barium titanate (BaTiO3) has been investigated under microwave-hydrothermal (M-H) conditions in the temperature range of 60-160°C using BaCl2, and TiCl4 as Ba and Ti sources, respectively.

TL;DR: In this article, a new concept process, a so-called as C2S2 process based on equal channel angular pressing, for fabricating the A1 alloy sheets with a high formability is introduced.

TL;DR: The average particle size of spinel ferrites obtained by the coprecipitation and microwave-hydrothermal (M-H) process is about 10 nm as discussed by the authors.

TL;DR: A semi-continuous process has been developed for the synthesis of TiO2 powders: a sol-gel reaction, using titanium isopropoxide as precursor and acetylacetone as chelating agent, followed by supercritical drying is performed as discussed by the authors.

TL;DR: In this article, a Pechini process has been used for preparation of yttria-stabilized zirconia gels and powders Thermal behavior of gel and relationships between processing parameters and structure and microstructure of the powders have been determine to use this route for the preparation of thin film of YSZ.

TL;DR: In this paper, the use of a new but simple and reactive technique employing metallic aluminum as one of the reactants to produce very high phase-purity magnesium aluminate powder under mild experimental conditions is described.

TL;DR: In this article, the synthesis of Yttrium Iron Garnet (Y3Fe5O12), Barium Ferrite (BaFe12O19), and Nickel Aluminate (NiAl2O4) in 1-10 min in a microwave field is described.

TL;DR: In this paper, X-ray powder diffraction pattern indicates that the product is single-phase magnetite in an inverse cubic spinel structure, and the magnetite particles are homogenous in the shape of quasi-sphere polyhedron with average diameter of 50 nm.

TL;DR: In this paper, a composite of nano-sized TiO2 particles and methyl cellulose was converted into titanium oxycarbide by heating at 1050°C, where the lattice parameter of the titanium carbide phase increased while the oxygen content in the specimen decreased, especially above 1300°C.

TL;DR: In this paper, the effect of Zn-B-O (ZB) glass additions on the sintering temperature and microwave dielectric properties of BaTi4O9 has been investigated using X-ray diffraction, scanning electron microscopy, dilatometry and electrical characterization.

TL;DR: In this article, the lattice parameter of body centered cubic (bcc) beta titanium was determined as a function of temperature and hydrogen concentration using neutron diffraction, and it was shown that hydrogen-induced expansion coefficient KH = 2.1×10-4 nm/at.

TL;DR: In this article, the effects of various reactive-element coatings on the oxidation kinetics of two commercial iron-based alloys, Ebrite and ANSI 446, at elevated temperatures were investigated.

TL;DR: In this paper, the authors measured the conductivity of consolidated nanoparticles of NiO, having different average particle sizes (2.5nm-17nm) in the temperature range 313 K to 423 K, and found that the most prominent conductivity mechanism was the large polaron conduction associated with holes in the 2p band of O 2-.

TL;DR: In this article, the antiwear ability of DDP-coated ZnS nanoparticles and non-decomposition-based nanoparticles as additives in liquid paraffin were evaluated on a four-ball machine, and the morphologies of the worn surfaces were examined by means of scanning electron microscopy (SEM).

TL;DR: In this article, low-temperature phases of R2SiO5 (R 5 Y, Tb, Dy, Ho, Er, Tm, and Yb) were synthesized by the solgel method.

TL;DR: The crystal structure of Ca0.25Cu0.75TiO3 has been studied between 25 and 1000°C using powder neutron diffraction methods as discussed by the authors, and there is no indication of any crystallographic phase transition.

TL;DR: In this paper, the nanosized mixture powders of ferric oxide and nickel oxide prepared by the coprecipitation in a stoichiometric ratio to form NiFe2O4 were subjected to shock wave treatment.

TL;DR: In this paper, a directional freezing method was used to obtain In 2 Se 3 crystals and the Raman spectra of the α-phase were measured with polarized light in different configurations of the crystals.

TL;DR: In this paper, a stable PST sol was obtained by mixing lead and strontium acetates dissolved in deionized water and ethylene glycol and a titanium alkoxide modified by chelating acetylacetone in 2-methoxyethanol.