Materials Literature
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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
Inorganic fullerene-like nested nanostructures (IFs) such as the WS2 IFs shown in the Figure deposited on an a-SiOx-coated TEM grid are confirmed to confer tribological advantages when added to a lubricant fluid (tetradecane) between two shearing mica surfaces. It is shown that the lower friction is associated with fr…
The freezing behavior of CCl 4 confined in graphitic micropores of activated carbon fibers (ACFs) was examined by use of differential scanning calorimetry over the temperature range of 180 to 320 K. For ACF of average pore width, w = 1.1 nm, we observed a clear peak showing that the freezing temperature is 299 K. The…
Abstract A diarylethene having 2-cyanopyrrole rings turned blue upon UV irradiation in ethyl acetate. The colored form was unstable and returned to the colorless open-ring form with a half-life time of 37 s at room temperature. The activation energy of the thermal fading was obtained to be 32.5 kJ / mol, which is less…
The paper presents a topological classification of the first-coordination-shell shapes for atoms in solids. The classification includes the coordination shells with up to 13 atoms in a shell. Application of the scheme to the classification of disclination junction configurations and interstitial hole shapes is discuss…
ICRF boronization - A new technique towards high efficiency wall coating for superconducting tokamak reactors, Jiangang Li, Yan Ping Zhao, Xue Mao Gu, Chen Fu Li, Bao Nian Wan, Xiao Dong Zhang, Jia Rong Luo, Xian Zhu Gong, Ji Kang Xie, Yuan Xi Wan, Ping Jian Qin, Xiao Ming Wang, Yue Dong Meng, Shen Fa Li, Xiang Gao, Y…