Materials Literature
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利用黏土矿物X射线衍射峰(XRD)拟合与分解的方法, 结合透射电子显微镜(TEM)和X射线能谱(EDX)分析, 发现在洛川黑木沟剖面黄土-古土壤序列(S<SUB>0</SUB>-L<SUB>10</SUB>)的黏土矿物中存在两种不同类型的伊利石, 一种是结晶度差、衍射峰宽且钝的伊利石, 其在<2µm的黏土矿物中的最高含量为55%; 另一种为结晶度好、衍射峰窄且锐的伊利石, 这两种伊利石的含量在剖面上呈明显的互补变化关系. X射线能谱分析表明, 与结晶度好的伊利石相比, 结晶度差的伊利石较富含K<SUP>+</SUP>, Si<SUP>4+</SUP>, 贫Al<SUP>3+</SUP>.
The crystal structure of La 0.67 Ca 0.33 Mn 0.80 Cu 0.20 O 3 (LCMCO) compound was determined from laboratory X-ray powder diffraction data and refined by the Rietveld method. LCMCO is isostructural with La 0.67 Ca 0.33 MnO 3 (LCMO). The crystal data are: La 0.64 Ca 0.36 Mn 0.82 Cu 0.18 O 3.01 , M r =843.80, orthorhomb…
Research Article| December 01, 2004 Rb-Sr Isotopic and elemental studies of the origin of glauconite in the Permian northern Karoo Coal Fields, South Africa: Evidence for a thermal Mid-Jurassic influence J. M. Barton, Jr.; J. M. Barton, Jr. Department of Geology, Rand Afrikaans University, P.O. Box 524, Auckland Park…
Using two hexagonal samples of ice, polycrystalline and single-crystalline, the electrical treeing has been investigated under an applied impulse voltage. The crystallinity and temperature of the ice play an important role in the events of the treeing. In the single-crystalline ice, the tree in the samples at -25 /spl…
Abstract This article discusses the principles of physical metallurgy and metallography of depleted uranium. It describes the techniques involved in the preparation of thin foils for transmission electron microscopy and illustrates the resulting microstructure of uranium and uranium alloys, with the aid of black and w…
The influence of synthesised benzoyl hydrazine and some of its substituents on the inhibition of corrosion of carbon steel in 1M sulphuric acid solution were investigated using weight loss, gasometric measurements, potentiodynamic polarisation studies and impedance measurements. Corrosion kinetic parameters clearly re…
Abstract In this paper we show that ‘permeability’ of a heterogeneous structure with mass transport and thermodynamic properties varying across its thickness is a misleading concept leading to incorrect results and design decisions while two structural transmission rate equations are recommended for practical applicat…
A wet chemical process has prepared Al-substituted barium ferrite nanoparticles BaFe11AlO19. Structural and magnetic properties of BaFe11AlO19 powers were characterized with an X-ray diffractometer, a vibrating sample magnetometer, and a Mössbauer spectroscopy. The results of X-ray diffraction measurements showed that…
A new nondestructive characterization technique, based on a modified Maker fringe measurement, is reported that allows the complete determination of complex spatial distributions of the nonlinear χ(2)(z) coefficient in planar samples. Each sample under test was stacked together with a phase reference quartz plate to r…
After two previous reconsideration steps on cathodic charging and hydrogen stress cracking, then permeation measurements, a third step is presented on the SOHIC mechanism, and more generally any interaction between internal hydrogen and moving dislocations. This results in a unified mechanism for all forms of hydrogen…
The effect of pressure on the ferromagnetic phase transition has been studied in manganese doped III-V semiconductors by electrical conductance and Hall measurements. We found that the application of hydrostatic pressure shifts the transition temperature upwards both in (In,Mn)Sb and (Ga,Mn)As. The anomalous-Hall coef…
Aqueous gelcasting with a low toxicity monomer system has attracted increasing attention. The present study attempts to enhance the flexural strength of green bodies gelcast from a low toxicity hydroxyethyl methacrylate (HEMA) system by introducing an appropriate amount of the water soluble polymer polyvinylpyrrolidon…
A stroll through memory lane highlighting the author's contributions to phthalocyanines, including synthetic aspects especially of binuclear species, manganese oxygen breathing chemistry, mixed valence species, solution and surface electrochemistry, electrocatalysis, two-electron concerted processes, charge transfer s…
Abstract The compounds [Ti(OPr) 3 (isoeugenolate)] 2 and [Ti(OR) 3 (OCH 2 CH 2 NH 2 )] 2 (R = i Pr, Et), obtained by reaction of titanium alkoxides with isoeugenol (2-methoxy-4-propenylphenol) or 2- aminoethanol, are centrosymmetric dimers with a central Ti 2 (μ 2 -OR) 2 unit. The isoeugenolate and 2-aminoethanolate l…
Thermoelectricity in general is of strong scientific and technologicalinterest due to its application possibilities ranging from clean energy to photonsensing devices. Recent developments in theoretical studies on t hethermoelectric effects, as well as the newly discovered thermoelectric materialsprovide new opportuni…
Observation has been made of the forming behavior of precipitated calcium carbonate polymorphs following changes in supersaturation. Based on the fact that supersaturation in precipitation reaction depends on the ion concentration of the reactants present in the solution, the forming behavior of calcium carbonate thro…
Compósitos de PVC, plastificados com diferentes sistemas de plastificação e reforçados com fibras de sisal, foram processados em moinho de dois rolos. A influência do tipo e teor do plastificante, do comprimento e do teor das fibras nas propriedades dos compósitos obtidos foi estudada. Dois tipos de plastificantes for…
Abstract Additives that act as flame retardants can contribute significantly to smoke generation because they decrease the efficiency of the fuel source and, as a result, create a sooty combustion. Work on a new phosphate ester material has shown interesting results and synergies that complement both flame retardancy…
Nous avons determine la structure cristalline de membres de la solution solide pyrophanite-ecandrewsite, Mn 1 - x Zn x TiO 3 (0.1 ≤ x ≤ ≤ 0.8 apfu), synthetisee selon des methodes ceramiques dans l'air a pression ambiante, par affinement de Rietveld de donnees obtenues par diffraction X sur poudres. Tous ces composes…
The impedance properties (resistance and capacitance) of oxide scales on the martensitic/ferritic steel HT-9 and austenitic stainless steel Type 316L (UNS S31603) were examined during immersion in lead-bismuth eutectic (LBE) using a technique similar to electrochemical impedance spectroscopy. These scales were created…