Materials Literature
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The solvothermal reaction of sulfur, selenium, or tellurium with cadmium metal powder in different organic solvents in the temperature range 120−200 °C was investigated systematically to prepare cadmium chalcogenides, CdE (E = S, Se, Te). The results showed that the character of the products, such as crystal size, sha…
The effects of the concentration of triphenylphosphine as a catalyst on the cure reaction of the biphenyl epoxy/phenol novolac resin system were studied. The kinetic study was carried out by means of the analysis of isothermal experiments using a differential scanning calorimeter. All kinetic parameters including the…
Select mechanical, thermal, and rheological properties of star-blocks consisting of 5–21 polystyrene-b-polyisobutylene (PSt-b-PIB) arms radiating from cyclosiloxane cores are described. The tensile properties of products containing 23–41 wt % of PSt are substantially higher (9.6–23.8 MPa) than those of linear triblock…
Thermal transitions of a glassy, main chain, liquid crystalline, random copolyester, HIQ-40, have been characterized. HIQ-40 is made from 40 mol percent p-hydroxybenzoic acid (HBA) and 30 mol % each of p-hydroquinone (HQ) and isophthalic acid (IA). This polymer is soluble in organic solvents, permitting the preparatio…
Polarized Raman spectra in ZnGeP2 crystal have been measured. The symmetry of vibrations has been assigned for every mode but one. The angular dispersion of the extraordinary phonon has been measured, and the result is described by the Loudon–Poulet approximation. Hydrostatic pressure dependence of Raman shift has bee…
Using angle-resolved photoemission spectroscopy, we probe the electronic band structure of ${\mathrm{TaTe}}_{4}$ single crystal samples. Resistivity and optical measurements were also performed on the same samples. The experimental data indicate a combination of quasi-one-dimensional and three-dimensional electronic p…
The electromigration wind force in various Al alloys is calculated using a Green's-function method for the calculation of the electronic structure. The influence of the environment of the jumping atoms is studied in detail in the Al-Cu alloy. Alloys of Al with $3d$ and $4sp$ alloying elements are studied systematicall…
We have observed local effects of the charge-density wave (CDW) in in situ Na-intercalated $1T\ensuremath{-}{\mathrm{VSe}}_{2}$ using scanning tunneling microscopy and spectroscopy between 300 and 60 K. Na intercalates nonuniformly, and divides the sample into intercalated (I) and nonintercalated (NI) areas. Below the…
We report on the evaluation of ion-beam induced damage in α-quartz and its dynamic annealing behavior in the temperature range between 80 and 1050 K using Rutherford backscattering spectrometry in channeling geometry. The results illustrate that the critical temperature for inhibiting amorphization during irradiation…
Metallic behavior down to low temperature is shown by charge transfer salts of BDH-TTP (1), a structural isomer of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF). In the case of (BDH-TTP)2PF6 this behavior is attributed to the structure, which is made up of κ-type sheets of BDH-TTP donor molecules and sheets of PF6−…
In situ transmission electron microscopy magnetizing experiments combined with Lorentz magnetic microscopy in Fresnel–Foucault modes were used to characterize the magnetic structure of die-upset, high energy-product hard magnets Nd13.75Fe80.25B6 and Pr13.75Fe80.25B6. Experimental observations indicate a well-aligned g…
Transdermal drug delivery systems are pharmaceutical products that can deliver controlled doses of drugs from polymeric patches applied on the human skin. The long-term stability of these patches is a critical issue relative to their performance in delivering drugs at a constant rate. Where a drug has been dissolved i…
Select mechanical, thermal, and rheological properties of star-blocks consisting of 5–21 polystyrene-b-polyisobutylene (PSt-b-PIB) arms radiating from cyclosiloxane cores are described. The tensile properties of products containing 23–41 wt % of PSt are substantially higher (9.6–23.8 MPa) than those of linear triblock…
Boron nitride thin films were deposited at room temperature with various ion energies by mass selected ion beam deposition on cubic boron nitride (c-BN) previously nucleated on Si (100) substrates at a higher temperature. Selective area diffraction, electron energy loss, and infrared spectroscopy results reveal contin…
The critical behavior in the vicinity of antiferromagnetic instability has been investigated for the filling-controlled insulator-metal transition system, ${\mathrm{LaTiO}}_{3+\ensuremath{\delta}/2},$ by transport and specific heat measurements. With the increase of nominal hole doping $\ensuremath{\delta},$ the syste…
Biaxially oriented nonlinear dielectric Ba0.6Sr0.4TiO3 (BST) films have been grown on polycrystalline ferrite yttrium iron garnet (YIG) substrates. We use a structurally and chemically compatible MgO buffer to improve the crystallinity of the BST on polycrystalline YIG substrates, where the biaxially oriented MgO is d…
Microelectronic circuits often fail because of voids and cracks that cause open circuits in their interconnects. The voids form due to severe thermal stresses and high current densities present in the lines during service. Typical interconnect lines contain large numbers of voids which gradually grow and change their…
We have developed a simple fabrication process which allows the production of nanoscale silicon structures. Rough silver films are used as an etching mask for reactive ion etching at 10 °C. Variation of the etching parameters, such as the rf power, allows control over the shape of the features; the production of both…
PbZr 0.2 Ti 0.8 O 3 (PZT) thin films with and without La0.5Sr0.5CoO3(LSCO) electrodes were grown epitaxially on (001) SrTiO3 at 650 °C by pulsed laser deposition. The domain structure of the 400 nm thick PZT films with different electrode layer configurations was investigated by x-ray diffraction and transmission elec…
To understand the mechanism of electron field emission from diamond-like carbon, tetrahedral amorphous carbon (ta-C) films were subjected to Ar, H2, and O2 plasma treatments to change their surface condition and were deposited on substrates of different work function. The threshold fields and current densities for und…