Materials Literature
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The motion of phase-separating liquid drops was simulated in two dimensions following the model H, where convection and diffusion are coupled via a body force, expressing the tendency of demixing systems to minimize their free energy. This driving force depends on the capillary number, i.e., the ratio of viscous to th…
The reflectance spectra of bulk superionic glasses $x\mathrm{AgI}\ensuremath{-}(1\ensuremath{-}x)[{\mathrm{Ag}}_{2}\mathrm{O}\ensuremath{-}n{\mathrm{B}}_{2}{\mathrm{O}}_{3}]$ with $n=2,$ $0<~x<~0.65$ (diborate) and $n=0.5,$ $0.40<~x<~0.60$ (pyroborate) have been measured in the infrared to investigate the…
The Warren-Averbach (WA) analysis of X-ray Bragg-peak broadening, as well as simplified methods, are employed in the characterization of a set of nanocrystalline Fe powder samples with a wide range of grain sizes. In the WA analysis, the hook effect present at short times is attributed to small-angle grain boundaries.…
Cu/Ti3SiC2 composite, a new electrofriction material, was prepared, for the first time, by PM method. The microstructure, mechanical and electrical properties of the Cu/Ti3SiC2 composites were investigated and were compared with those of Cu/graphite composites. The results demonstrated that Cu/Ti3SiC2 composites had s…
The dependence of the cellular (biogenic) and frustule-associated (mineralized) silica content of the diatoms Navicula salinarum and Thalassiosira weissflogii on salinity and aluminium conditions was studied in order to make it possible to manipulate silicification in vitro and maximize it to levels required for physi…
Ternary vanadium oxide glasses in the system ${\mathrm{V}}_{2}{\mathrm{O}}_{5}{\ensuremath{-}\mathrm{C}\mathrm{o}\mathrm{O}\ensuremath{-}\mathrm{T}\mathrm{e}\mathrm{O}}_{2}$ are fabricated by press quenching of glass melts, and dc conductivities (\ensuremath{\sigma}) are investigated at temperatures from 330 to 475 K…
Several fundamental aspects of defect cluster accumulation in irradiated ceramics and face centered cubic metals are reviewed, with particular emphasis on radiation hardening and the microstructural evolution in Cu observed by transmission electron microscopy (TEM). At temperatures where interstitials are mobile (> 50…
Several minerals and inorganic compounds contain (XA 4 ) tetrahedra, with anions, X (O 2- , N 3- , and F - ), as central atoms and cations, A (Cu 2+ , Zn 2+ , Pb 2+ , Bi 3+ , REE 3+ , etc.), as ligands. These tetrahedra are well defined in these crystal structures because the bond valences between A and X are essentia…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCrystalline Transitions in Nylon 12C. RameshView Author Information Polymer Chemistry Division, National Chemical Laboratory, Pune, India 411 008 Cite this: Macromolecules 1999, 32, 17, 5704–5706Publication Date (Web):August 7, 1999…
A molecular dynamics simulation is performed to study the kinetics of microphase separation in a polymer-dispersed-liquid-crystal forming process. An equimolar mixture of monomers and liquid crystal molecules are thermalized in a well mixed state. The monomers are then polymerized at the same temperature. The end prod…
Recent point-defect calculations for Al2O3 by Lagerlof and Grimes have been used to rationalize oxygen diffusion in undoped, MgO-doped and TiO2-doped Al2O3. The amphoteric nature of Al2O3 is emphasized by the calculations; oxygen and aluminium diffusion will be dominated by oxygen vacancies and aluminium interstitials…
Angle calculations are derived for the operation of a `4S+2D' six-circle X-ray or neutron diffractometer. The six degrees of freedom [four sample-orienting (`4S') and two detector-orienting (`2D')] of the diffractometer are used to control the scattering vector and a reference vector in the laboratory frame of referen…
The difference in crystallization behavior between the as-deposited amorphous state and the melt-quenched amorphous state of Ge 2 Sb 2 Te 5 alloy has been studied using a dynamic tester. The melt-quenched amorphous alloy showed much shorter crystallization time than did the as-deposited one. We laser-annealed the as-d…
Visco-elastic properties of 5CB as a function of temperature in the nematic region are studied. Three Miesowicz viscosity coefficients ηa ηb and ηc and rotational viscosity γ1 are determined by dynamic light scattering (DLS) measurements. By assuming α3 ≅ 0, other Leslie viscosity coefficients are also calculated. Fit…
An instrument has been designed for the routine analysis of the optically stimulated luminescence signal from single grains of sand. The system is capable of analysing over 3000 individual grains in a single measurement sequence, and the OSL signal from each grain can be read in less than 3 s. The design principles ar…
The isoelectric point of the oxide‐covered aluminum surface is an important parameter in the pitting behavior of aluminum and of aluminum binary surface alloys. Contact angle measurements show that ion implantation of Ta into Al modifies the isoelectric point of the resulting oxide film to a value which is intermediat…
This chapter contains sections titled: Introduction Thermodynamics Morphology Kinetics Conclusions
Carbon nitride films were grown on Si(100) substrates using d.c. magnetron sputtering with r.f. bias. Reactive deposition was achieved using a graphite target in an argon/nitrogen plasma. These films were characterized by transmission electron microscopy (TEM), XPS and Fourier transform infrared spectroscopy (FTIR) sp…
We discuss the phenomenology related to the pressure behavior of viscosity in low-molecular-weight glass-forming liquids. We show that the effect of pressure on viscosity in two examined glass-forming systems, salol and ortho-terphenyl, can be satisfactorily described, over considerable ranges of pressure (up to 1 GPa…
This chapter contains sections titled: Introduction Experimental Procedure Results Discussion