Materials Literature
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Thermal boundary resistance (Rb) plays an important role in the design and performance of thin-film high-temperature superconducting devices, such as infrared detectors and optical switches, which rely upon the temperature rise of the film as the basis for their operation. Although there is general agreement on the ma…
The formation, growth, and dissolution of the passive film on iron in neutral and alkaline solutions was investigated using a light reflectance technique. It was found that depending on the hydrodynamic conditions the formation of a hydroxide layer can take place during passivation. The strong influence of the hydrody…
The room-temperature crystal structure of the perovskite lead hafnate PbHfO 3 is investigated using both low-temperature single crystal X-ray diffraction (Mo K α radiation, λ = 0.71069 Å) and polycrystalline neutron diffraction (D1A instrument, ILL, λ = 1.90788 Å). Single crystal X-ray data at 100 K: space group Pbam…
When single crystals of two different materials are in contact at a sharp interface, the orientation relationship between them is said to be epitaxial and the configuration of the atoms at the two sides of the interface is such that the lattice mismatch between them is accommodated in the least energetic way. Among ot…
Copper–alkali ion exchange was performed by immersing different silicate glasses (soda-lime and BK7) in different molten eutectic salt baths (CuSO4:Na2SO4 and CuSO4:K2SO4). The obtained optical waveguides were characterized by m-lines spectroscopy for the determination of refractive index profiles, and by secondary io…
A 28 kDa protein associated with the inner membrane was induced strongly in Escherichia coli K-12 cells grown in the presence of a hydrophobic organic solvent, n-hexane or cyclooctane. These organic solvents suppressed the growth (growth rate and yield) of E. coli. A partial amino acid sequence showed that this protei…
An experimental investigation was conducted to determine the pseudoelastic hysteresis damping characteristics of Ni-Ti Shape Memory Alloy (SMA) wires. The comprehensive study examines the effects of cycling, oscillation frequency, strain amplitude, temperature, and static strain offset on the pseudoelastic stress-stra…
Polycrystalline ceria doped with several rare‐earth oxides ( , and ) at various concentrations were fabricated. Conductivity was measured by ac admittance and dc four‐probe methods. The conductivity was separated into grain and grain boundary contributions using complex admittance technique as well as the grain size d…
Analytical expressions for the transmission factor and peak shift for absorbing cylindrical specimens or crystals are given. These expressions can be used over a range of μR useful in X-ray scattering experiments, typically μR < 10. Comparison with tabulated values of the transmission factor obtained by numerical calc…
The oxidation behavior of silver (Ag) nanometer particles (about 3 nm in diameter) within pores of a silica host in ambient air (298 K) was investigated from optical absorption measurements. Thermodynamic analysis indicates that Ag nanoparticles can be oxidized in air at room temperature. Exposure to air results in a…
Abstract The thicknesses of fundamental illite particles that compose mixed-layer illite-smectite (I-S) crystals can be measured by X-ray diffraction (XRD) peak broadening techniques (Bertaut-Warren-Averbach [BWA] method and integral peak-width method) if the effects of swelling and XRD background noise are eliminated…
A new recycling technique has been developed which uses a natural solvent, d limonene, to shrink expanded polystyrene (EPS). d-Limonene is a natural vegetable oil which is extracted from the rinds of citrus fruits and is a good solvent of EPS. Limonene has almost the same solubility as toluene at room temperature. Thi…
A mechanistic picture of the effects of rubbing on polyimide alignment layer (AL) surfaces and nematic liquid crystal (LC) pretilt angles (ΘP), leading to establishing a mechanism of determination of ΘP’s, was proposed on the basis of the study of the change in surface polarity of a polyimide AL with the rubbing force…
The phonon dispersion curves of cubic BaTiO3 have been computed within a first-principles approach and the results compared to the experimental data. The curves obtained are very similar to those reported for KNbO3 by Yu and Krakauer (Phys. Rev. Lett., 74, 4067 (1995)). They reveal that correlated atomic displacements…
Magnetostriction parallel and perpendicular to the applied magnetic field has been measured for ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3}$ $(x=0.3, 0.5)$ over a wide temperature range $(4.2<~T<~300$ K) and up to a maximum field of 14.2 T. We find a huge anisotropic magnetostriction $({…
The kinetic mechanism of the thermal cure of a phenylethynyl-terminated imide model compound, 3,4′-bis[(4-phenylethynyl)phthalimido]diphenyl ether (PEPA-3,4′-ODA) and a phenylethynyl-terminated imide oligomer PETI-5 (MW 5000 g/mol) was studied. FTIR was used to follow the cure of the model compound, while thermal anal…
Hard, refractory particles long have been added to ceramic materials to impart creep resistance. The nature of such particles and the volume fraction added may vary widely between different systems. As a result, a rich variety of creep behavior and of attendant mechanisms is found. A critical survey is presented of th…
The power-dependent relaxation dynamics of photoexcited charge carriers in a number of II-VI semiconductor quantum dots have been studied using femtosecond laser spectroscopy. The dynamics are obtained via excitation of the quantum dots with high power 390 nm pulses of 150 fs duration, and probing of the photoexcited…
B-doped ZnO films are prepared on Corning 7059 glass by atomic layer deposition (ALD) using diethylzinc (DEZn), H 2 O as reactant gases, and diborane (B 2 H 6 ) as a dopant gas. A two-step deposition process is introduced to grow textured and low-resistivity ZnO films by combining the ALD and conventional photo-induce…
The influence of alloying levels in the ranges from 0.01% to 0.5% N, 4.5% to 6% Mo, and 0.2% to 10% Mn on pitting corrosion resistance was investigated for austenitic stainless steels (SS) with a base composition of 20% Cr and 18% or 25% Ni. Results were analyzed in terms of the pitting resistance equivalent (PRE) con…