Materials Literature
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Molecular dynamics simulations of computer have been performed on the local structure and bond orientation order of liquid metal Pb at 623 K. Results show that, at point near melting temperature, the local structures of liquid metal Pb show cubic symmetry, and the long-range correlation of this symmetry is weak.
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Article Temperature dependence of the silver distribution in Ag2MnP2S6 by single crystal X-ray diffraction was published on June 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 203, issue 1-2).
One of the main defects in the self-frequency doubling crystal of Nd 3+ -doped YAl 3 (BO 3 ) 4 (NYAB), which may be the key factor to influence the crystal performance, is the growth zone boundary that has been identified by means of x-ray diffraction topography. The characteristic boundary is formed usually by the ba…
An activity geared toward a course where experiments are designed to investigate the preparation of materials, the properties essential to understanding their formation, and the optimization of their application.
We studied the influence of substrate defects on the morphological and transport properties of Y1Ba2Cu3O7−x high Tc superconducting thin films. The substrate defects were characterized by dispersive and nondispersive cathodoluminescence in the scanning electron microscope. The morphology of the films was studied by th…
It is known that the chicken flank somatopleure also has a limb-forming potential at early stages of development, but loses this potential later. Molecular changes during this process is, however, not well known. We obtained a monoclonal antibody which reacts to the flank somatopleure, but not to the wing bud, the leg…
ABSTRACT The extent of oxidative and storage stability of margarine samples were determined by measuring peroxide values (PV) and Accelerated Shelf‐Life Testing (ASLT). Two margarine samples, A and B, which were packaged with parchment and Acrylonitrile butadiene styrene (ABS), respectively, were studied to predict th…
Electron paramagnetic resonance (EPR) of Mn2+, Ni2+, and Cu2+ in magnesium fluosilicate hexahydrate (MgSiF6.6H2O) crystals has been studied at X- and Q-band frequency in the temperature interval 77 ÷ 400 K. At cooling of crystals with natural abundance of 3dn-ions, at T i1 = 370 ∓ 0.5 K, T i2 = 344 ∓ 0.5 K, T c = 296…
Electrical studies of quaternary solid solutions Pb1-xSnxTe1-ySey in a wide composition range revealed the phase transition, occurred at unexpectedly low x (x > 0.08). It is shown that this phase transition may be associated with Sn off-center ions. The unusual enhancement of T c, induced by substitutional disorder, w…
The dissolution behavior of Cu metal in hydrogen peroxide (H2O2)-ethylenediaminetetraacetic acid (EDTA) solution was studied through both electrochemical and chemical tests. In the electrochemical experiments, the open circuit potential (OCP) of Cu electrode at low H2O2concentration below 0.5wt% was determined by Cu a…
A general method for the preparation of amide-containing aromatic polyether ketones has been developed. Polymerization is based on a ketone-activated halo displacement in amide-containing bis(4-fluorobenzoyl) moieties by phenoxides. N,N-Bis[4-(4-fluorobenzoyl)-(4-phenoxyphenylJ]terephthalamide and 4-[(4-fiuorobenzoyl)…
Conditioning behavior of surface flashover strength of a large-bandgap insulator (quartz) is investigated with the aid of streak photography in conjunction with electrical (voltage and current) and optical UV (phototube) diagnostics. The breakdown strength of the sample is found to be conditioned during the initial te…
Article Crystal structure of tetrapotassium hexaselenodistannate, K4Sn2Se6 was published on June 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 203, issue 1-2).
Several technologies have been reported for the synthesis of AlN. These are reviewed and described in detail. The processes are classified according to the principle of synthesis, and the AlN product characteristics for each method of synthesis are identified. Only two of the methods reported, direct nitridation and c…
The study of poorly crystallized compounds by X-ray powder diffraction is sometimes very difficult because structural information is not easily obtained. One way to determine these structural data is to test more or less complex crystallographic models and compare simulated wide-angle X-ray scattering (WAXS) and small…
The phase diagram for the ternary system MgO─P 2 O 5 ─H 2 O at 25°C has been constructed. The magnesium phosphates represented are Mg(H 2 PO 4 ) 2 · n H 2 O ( n = 4, 2, 0), MgHPO 4 ·3H 2 O, and Mg 3 (PO 4 ) 2 · m H 2 O ( m = 8, 22). Because of the large differences in the solubilities of these compounds, the technique…
Ellipsometric spectra of polyaniline which is one kind of new conducting polymers are measured. The complex dielectric function, the index of refraction and the absorption coefficient of insulating polyaniline as the functions of photon energy are obtained. The absorption spectra obtained by us and other authors are c…
Specimens of an aromatic polyamide (Aramid) paper, which were subjected to various degrees of moisture adsorption as well as water immersion, were investigated in order to estimate how much the adsorbed moisture and the stored water affect the dielectric and thermoanalytical behavior. In the humid specimens the dielec…
Due to its high crystallinity and purity, hydrothermal powder was used to study the effects of grain size and density on the dielectric properties of BaTiO3. Curie-Weiss analysis was used to analyze the results as porosity increased. A correlation was found between the level of porosity and the difference between the…