Showing papers in "Materials Letters in 1997"

TL;DR: In this paper, a spray pyrolyzed CuS thin film with aqueous solution containing CuCl2 · 2H2O, thiourea and cationic surfactant is presented.

TL;DR: In this paper, a co-precipitation method that employs accurate control of pH and temperature was used to transform a monophasic zircon-type tetragonal BiVO 4 to the monoclinic form.

TL;DR: In this paper, a carbon dioxide laser with a maximum output of 5 kW in the continuous wave mode was used to make bead-on-plate and autogenous butt weld joints.

TL;DR: In this article, the authors synthesize hydrotalcites (crystalline mixed oxides of magnesium and aluminum) by the sol-gel method at pH 10, and the resulting solids were characterized by infrared spectroscopy (FTIR) and thermal analysis (DTA-TGA).

TL;DR: In this paper, the problem of lead-zirconate-titanate diffusion was solved by using a screen-printed barrier layer of IP211 (Heraeus), which also reduces the diffusion and prevents the conduction.

TL;DR: In this article, the structural transformations in Ni-Ti-Hf alloys fabricated by melt spinning have been studied using X-ray diffraction scanning and resistivity measurements, and the effect of Hf on lattice parameters of both the martensitic and parent phases and transformation characteristics is reported.

TL;DR: In this paper, a simple and convenient method for the synthesis of PZT powder with different compositions near the morphotropic phase boundary is reported, which involves auto-combustion of a citrate-nitrate gel resulting from a thermally induced oxidation-reduction reaction forming an ash, which on calcination produces the desired powder.

TL;DR: In this paper, a brief review of the MOCVD process as it applies to semiconductors is presented, including various precursors used, including metalorganic compounds, hydride gases, and dopants, together with the basic deposition process.

TL;DR: In this paper, the aqueous solution containing zinc cations was well emulsified in n-heptane solution, and then precipitated by adding ammonia, and a submicron zinc oxide powder with a near spherical morphology was obtained.

TL;DR: In this article, a sol-gel process was developed for the chemical synthesis of zinc tert-butoxide and H2S as precursors in a toluene solution.

TL;DR: In this paper, the influence of experimental conditions on the preparation of nanocrystalline Fe3O4 powders is discussed, and the average particle size is 16 nm, which is the smallest known particle size in the literature.

TL;DR: In this article, the Mg 2 X (X = Si, Ge, or Sn) intermetallic phases have been synthesized by mechanical alloying of blended elemental powders for the first time.

TL;DR: In this paper, a piezoelectric secondary phase was incorporated into the ceramic matrix as a toughening phase, and energy dissipation by the piezelectric effect was suggested as a new tougheening mechanism in a BaTiO3 toughened Al2O3 system.

TL;DR: In this article, a liquid phase method for the preparation of dodecanethiol-derivatized silver nanocrystals is reported, where X-ray diffraction and transmission electron microscopy (TEM) are used to obtain size and structural information about the nanocrystal core.

TL;DR: In this paper, pure lanthanum aluminate (LaAlO3) powders were prepared by the evaporation of polyvinyl alcohol added to a mixed metal nitrate solution.

TL;DR: In this paper, the incorporation of activators (Eu3+ and Ce3+, Tb3+) in these very porous powders was checked by X-ray diffraction (XRD), scanning electron microscopy (SEM) and luminescence investigations.

TL;DR: In this paper, a cathodic electrosynthesis of RuO2 deposits on Ni, Ti, Pt foils and Si wafers was accomplished via hydrolysis by an electrogenerated base, RuCl3 · xH2O, dissolved in water.

TL;DR: In this paper, the double-microemulsion-derived precursor led to the formation of ultrafine manganese zinc ferrite particles when calcined at 600 °C, although particle agglomeration had occurred.

TL;DR: In this article, the workhardening behavior and the microstructure change of medium manganese steel and Hadfield steel were studied by impact abrasive wear tests, TEM and Mossbauer spectrometer.

TL;DR: In this article, the relative dispersibility of intercalated R4N+M samples in polar and nonpolar solvents was evaluated on the basis of viscosity, showing that the DHMC-M and DCEM-M complexes exhibited good dispersibility due to the hydrophilic functional groups in the organic cations.

TL;DR: In this paper, a tensile test was performed on heavily cold drawn and annealed pearlitic steel wires, on which wire drawing induced a partial dissolution of the cementite phase.

TL;DR: An atomic oxygen (AO) experiment designed to measure the AO environment and the erosion rate of selected materials is currently flying on a microsatellite (STRV-la) as mentioned in this paper.

TL;DR: Spinel (MgAl2O4) is prepared by a combined gelation-precipitation process from a mixed solution of sulphates of aluminium and magnesium, and X-ray diffraction of gel samples calcined at different temperatures shows that a spinel-like phase starts forming at 600 °C and complete conversion is obtained at 1000 °C in 1 h as mentioned in this paper.

TL;DR: In this article, the formation of α-Fe 2 O 3 particles by forced hydrolysis of partially neutralized FeCl 3 solutions with tetramethylammonium hydroxide (TMAH) was investigated.

TL;DR: In this article, a hardness peak was observed for Alloy 718 at a cooling rate of 5 °C/min, which corresponded to the maximum volume fraction of the γ-precipitates.

TL;DR: In this article, the preparation of copper powders most suitable for thin-film conductors was investigated, where reaction of CuCl with ethylenediamine at room temperature gives spherical polymodal copper powder with particle diameters of 0.79 ± 0.35 μm.

TL;DR: In this article, different steps in the process leading to the formation of β-aluminas are discussed based on IR, TG/DTA and XRD studies, and results of studies to optimise the conditions for the preparation by changing parameters such as calcination temperatures and initial concentration of isopropoxides are reported.

TL;DR: In this paper, the synthesis of in situ formed TiC/Al composites utilizing the reaction between molten aluminium and preforms consisting of unreacted Ti and C powders was studied.

TL;DR: In this article, a pellet form of polycrystalline yttrium aluminium-chromium iron garnets (Y 3 Al x Cr x Fe 5 − 2 x O 12 ) with varying Al-Cr substitution (0 ≤ x ≤ 1.0) have been prepared in the pellet format, and studied by X-ray diffraction, magnetization, a.c. susceptibility and electrical resistivity measurements.

TL;DR: In this paper, the use of polymeric precursors was employed in preparing SrTiO 3 thin films by dip coating using Si (111) as substrate, and crack free films were obtained after sintering at temperatures ranging from 550 to 1000 °C.