Materials Literature
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Porous silica was prepared by selective leaching of metakaolinite with 20 mass% HCl solution. The metakaolinite was derived from the 1:1 layered structure clay mineral kaolinite by firing at 600°C for 24 h. The characteristics of porous silica were studied. The content of Al2O3 in metakaolinite was sharply changed fro…
Using mathematical modeling of crystal growth processes, we have analyzed the chemical homogeneity of single crystals grown from solution by conventional techniques. The results indicate that all of these techniques are, in principle, unsuitable for the growth of homogeneous single crystals. A mathematical model has b…
In this paper the preparation of carbon fiber reinforced ultra-high temperature ceramic matrix composites was reported. Polymer infiltration and pyrolysis process was used to prepare 2D C/TaC-SiC, C/NbC-SiC, and C/ZrC-SiC composites. The fracture strengths of all the samples were around 300MPa and toughness around 10M…
Subsolidus sections in the systems Li 3 PO 4 -InPO 4 (950°C) and Na 3 PO 4 -InPO 4 (800, 900, and 1000°C) have been studied by X-ray powder diffraction. The compound Li 3 In(PO 4 ) 2 has been synthesized, and the nasicon-type solid solution Li 3(1 − x) In 2 + x (PO 4 ) 3 (0.67 ≤ x ≤ 0.80). has been found to exist. In…
A wax finish of cotton yarn was used to investigate the frictional properties and lint contamination during the knitting process. The coefficient of friction was calculated with the measured yarn tensions by a developed test rig and the amount of lint created during the test was also measured with the test rig. The wa…
Ba ( Zr 0.2 Ti 0.8 ) O 3 (BZT) and 2 mol% Mn additional doped BZT ( Mn -BZT) thin films were deposited by pulsed laser deposition technique under the same growth conditions on LaAlO 3 substrates with the bottom electrodes of LaNiO 3 . The microstructure of the films was characterized by X-ray diffraction (XRD) in the…
The precipitation of copper during aging at 600°C in high-purity Fe-Cu alloy was examined by means of transmission electron microscopy, Nano-scale copper-rich clusters with B2-like structure were observed during either solution treatment or aging, which should play important role on precipitation strengthening. In add…
This article introduces the research and development being undertaken at NTT on solid oxide fuel cells, which are expected to achieve the highest efficiency among fuel cells.Fuel cells are efficient devices for generating electric power by using the chemical reaction between a fuel and oxygen.They are not only expecte…
ISHS IV International Symposium on Seed, Transplant and Stand Establishment of Horticultural Crops; Translating Seed and Seedling Physiology into Technology GERMINATION OF CRITHMUM MARITIMUM UNDER SALINE CONDITIONS
Pyrochlore structure oxide (La0.5Sm0.5)2(Zr0.9Ce0.1)2O7 was prepared by mixing the appropriate amounts of ZrO2, La2O3, Sm2O3 and CeO2, followed by reacting at 1600°C for 10 h. It was shown that the thermal conductivity was much lower than that of 8YSZ, which was mainly ascribed to the oxygen vacancies and lattice stra…
Ba 0.6 Sr 0.4 TiO 3 (BST) and Ba 0.6 Sr 0.4 TiO 3 / Ba ( Zr 0.2 Ti 0.8 ) O 3 / Ba 0.6 Sr 0.4 TiO 3 (BST/BZT/BST) multilayer (ML) films were prepared by pulsed laser deposition on the LaNiO 3 -coated LaAlO 3 substrate. X-ray diffraction analysis revealed that the two kinds of films could be epitaxially grown in pure si…
Abstract The texture and microstructure transformations during the annealing of highly cold-rolled silver, α-brass and phosphorus copper were studied using electron microscopy and calorimetry. The results imply that recrystallization is a superposition of several local processes which proceed in two stages. In all mat…
It has been determined that nanostructures of various modifications form during the pyrolysis of hydrocarbons at temperatures of 600° to 850°C in the matrix of iron‐chromic spinel. The research performed by means of electron microscopy, X‐ray diffraction, infrared spectroscopy, and electron spin resonance (ESR) showed…
The current theory of the strength of solids is supplemented by an account of thermodynamic linear tension and its variations in the course of crack growth. For the case of dispersion interactions, two mechanisms of crack growth are compared, i.e., the conformal mechanism (when the angle at the crack tip is conserved)…
Measurements of the maximum transmittance of an in‐plane switching liquid crystal display showed that it increases as rubbing angle is increased from 10 to 20°. This dependence was analysed in terms of the local variation of electric field intensity between electrodes, which in turn makes liquid crystal at various pos…
With citric acid as chelating agent, ethylene alcohol as etherification agent and water as solvent, NaNbO3 nanopowder was synthesized by citrate sol-gel method. The effects of amount of CA and EG, pH value on the stability of the precursor sol were investigated. The evolution of NaNbO3 crystal phase was also investiga…
To build their shells, brachiopods secrete a mixture of proteins and polysaccharides, collectively called the organic matrix. This matrix mediates the calcification process by allowing crystal nucleation followed by elongation and finally by stopping the crystal growth. Ultimately, the matrix controls the different mi…
Memory hysteresis, memory window and charge retention behaviour of an Al/Si3N4/Si structure with Si nanocrystals embedded in the Si3N4 layer are studied by fitting the results of a computer simulation to the experimental ones using simple analytical expressions. It is concluded that the current through the control nit…
Abstract By incorporating the constitutive equations based on classical plasticity and the mechanism-based strain gradient plasticity with finite element software, the stress–strain relationships and uniform elongations of Al polycrystals with different grain sizes were studied numerically. The calculation results ind…
Metastable phase relations in the PbO-GeO 2 system have been studied by DTA and X-ray powder diffraction. Metastable equilibrium was acquired during the solidification of a melt while it was slowly (at 8 K/min) cooled from temperatures slightly exceeding the critical value for a given composition. In the metastable eq…