Materials Literature
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The critical thickness for ferroelectricity has assumed importance because of the integration of ferroelectric perovskite films into microelectronic devices. Recent calculations reported by Junquera and Ghosez (J. Junquera and Ph. Ghosez, Nature, 2003, 422, 506, ref. ) have shown the critical thickness in the case of…
This study seeks to clarify the effects of gas contamination from milling atmospheres of mechanical alloying (MA) on mechanical properties. An iron-based dispersion alloy of Fe-13Cr-3W-0.5Ti-0.5Y2O3 (mass%) was selected as the experiment material. We prepared MA powders by milling mixed powders in atmospheres of argon…
Plastic deformation study of Bi2Te3-related materials was performed. The ingots were grown by the Bridgman method using source materials with nominal compositions of Bi0.5Sb1.5Te3, Bi2Sb2.85Se0.15 and Bi1.8Sb0.2Te2.85Se0.15. Disks were cut from the ingots, and were then deformed by either cold-pressing or by hot-press…
A new concept of solidification method by compression shearing is developed. By this method the grain size of the fabricated material is fined to nanometer scale, and the strength of the specimen is improved. Appling compression shearing process to powder Aluminum under room temperature and in the atmosphere, we can o…
The paper deals with both the internal stresses occurring during steel quenching in various heat-treatment processes for steels and the occurrence of residual stresses. Residual stresses are caused by plastification of a material on a micro-level, which results in the distortion of machine parts and residual stresses.…
Corrosion tests in supercritical water and 500°C steam were performed on Zr-based model alloys up to 132 days to evaluate the potential use of Zr alloy cladding in the supercritical water reactor (SCWR). Corrosion tests performed in dynamic and static conditions showed similar results, and the 500°C steam test also sh…
Grain growth rates in sputtered Cu thin films were found to be influenced by impurity levels of the sputtering targets. The Cu thin films with thickness of 100 nm or 1 μm were deposited on the rigid substrates by a sputter-deposition technique using the Cu target with purity of 99.99% (4N) or 99.9999% (6N), then subse…
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Chalcogenide glasses in the system AsxSe100-x, as well as As40Se60 and As50Se50 glasses doped with metals (Bi, Ge, Cd, Ag, Sn, Mn, Dy and Sm) were investigated by Raman spectroscopy. The Raman spectra of AsxSe100-x with 0x10 suggest that the majority building units are Se chains and Se8 closed rings. At higher As cont…
A photo-crystallographic study of Fe(btr) 2 (NCS) 2 ·H 2 O was performed in order to describe the modification of structures and charge densities on going from the ground low spin (LS) state to the metastable high spin (HS) state during the LIESST phenomenon at 15 K. Related photo-magnetic and spectroscopic measuremen…
The chemical polymerization of aniline was performed in phenylphosphinic acid (APP) medium using ammonium peroxidisulfate as the oxidizing agent, at 0 ?C and 25 ?C. The yield of polyaniline (PANI) was about 60?69 %. The polymerization process required an induction time 8?10 times greater than in other acids (hydrochlo…
In this paper the difference between the mechanical properties of woven and nonwoven fabrics is presented, and the important role of constructional parameters (particular the cover factor) of reinforcement fabric in the compound fabric is stressed. Some basic mechanical properties, such as tensile strength, elongation…
PtCo alloy nanoparticles with different metal elemental ratios (Pt/Co = 0.9, 1.6, 2.9, and 3.6) were prepared by a novel synthetic approach, using the transformation reaction of platinum(IV)/cobalt tetracyanoplatinate metal coordination nano-polymers (Pt(II)-CN-Pt(IV)/Co)via a H2 gas-phase reduction.
Recently, the global scale environmental problem has become a critical issue. In metallic material, not only the cost reduction and improvement of mechanical properties but also the decrease in environmental load is required. In copper alloys, several mass% Pb was added to improve the machinability. However, due to th…
Alkali-retting was applied to kenaf bast ribbons and the mechanical properties and the structure of the retted fibers were investigated. In order to produce the fibers with preferable surface smoothness, the retting should be made at the NaOH concentration higher than 4 %. The tensile properties, however, showed a max…
Field emission from nanostructured carbon materials is analyzed by applying the model of emission center in which the emitting surface contains two phases of carbon having substantially different electronic properties. In accordance with this model, the proposed mechanism involves electron tunneling through two potent…
Zinc oxide films were fabricated by a homemade spray pyrolysis system equipped with an optical setup ensuring the in situ control of the film growth. Zinc acetate (0.1 M) diluted in a mixture of ethanol and water was used as the precursor solution. The ethanol-water molar ratio, gamma, in the precursor solution was va…
Abstract A ternary hybrid of bismaleimide‐polyetherimide‐silica (BMI‐PEI‐SiO 2 ) was synthesized by sol‐gel reaction and characterized by scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results indicated that…
This work studies the influence of the climatic conditions during the Canadian winter using high-density PE (HDPE) samples exposed to weather conditions during different periods of time. Under these conditions, it is reasonable to think that the chemical changes caused by the climatic degradation will at first sight b…
The taxonomic and environmental characteristics of the diatom flora found in three bodies of water in the wetlands of Jilotepec-Ixtlahuaca, Estado de Mexico are described. Six samplings were made (January-October, 2001). Benthic and planktonic diatoms growth were collected.The samples were analyzed with a Light Micros…