Materials Literature
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The electrical transport properties of SiO2 films (⩾3 μm in thickness) containing Ge nanocrystals have been studied. We found that the films exhibit T−1/2 dependence of ln(σ) under relatively low electric fields independent of the volume fraction of Ge in the films, where T and σ are the temperature and the conductivi…
Technologically important lead‐based ferroelectric niobates of the type A(B′B″)O 3 (where A is Pb, B′ is Fe, Ni, Mg, or Zn, and B″ is Nb), and their solid solutions with barium titanate and lead titanate, have been prepared via a solution combustion process that involves metal nitrates/oxalate and tetraformal trisazin…
A new procedure to perform quantitative analysis without any internal standard has been developed within Rietveld analysis. This new approach permits solution of the problem due to the presence of an amorphous phase when its chemical composition or the global sample composition is known. The equations developed, based…
The concept of the reference lattice has been thoroughly discussed in physical and in higher-dimensional spaces. Such an approach has been applied to diffraction pattern analysis of different periodic, modulated and other aperiodic structures. It has been shown that two periodicities can be found in diffraction patter…
We measured the third-order susceptibilities χijkl〈3〉 of new bisdithiafulvenyl-substituted tetrathiafulvalene, using the degenerate four-wave mixing method. From these measurements we deduced the values of the second-order hyperpolarizabilities γ and their molecular and electronic contributions. We compared the third-…
This article is devoted to the conduction mechanisms involved in some highly electrically anisotropic resin–graphite particle composites. These materials are known to show a percolation phenomenon as the filler content is varied; they are epoxy or polyurethane based, the conducting particles are oriented single-crysta…
This volume describes the state-of-the-art research topics in theoretical materials science. It encompasses the computational methods and techniques which can advance more realistic calculations for understanding the physical principles in new growth methods of optoelectronic materials and related surface problems. Th…
Abstract Natural‐fibre‐mat‐reinforced thermoplastic (NMT) composites based on flax fibre mats and a Polypropylene (PP) matrix were manufactured using (i) a film‐stacking method and (ii) a paper making process. The influence of fibre length and fibre content on stiffness and strength is reported and compared with data…
We have investigated the effect of the increase of the one-electron ${e}_{g}$ bandwidth $(W)$ on the ferromagnetic and antiferromagnetic transitions in charge ordered ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ by substituting bigger ${\mathrm{Sr}}^{2+}$ ions for ${\mathrm{Ca}}^{2+}$ ions through electr…
Other| February 01, 1998 Single-crystal Raman spectroscopy study of dickite Clifford T. Johnston; Clifford T. Johnston Purdue University, Crop, Soil and Environmental Sciences, West Lafayette, IN, United States Search for other works by this author on: GSW Google Scholar Jozef Helsen; Jozef Helsen Search for other wor…
Hydrogen atoms have been produced at 77 K in single crystals of potassium dihydrogen phosphate (${\mathrm{KH}}_{2}{\mathrm{PO}}_{4}$ or KDP) using either 60-kV x rays or the fourth harmonic (266 nm) of a pulsed Nd:YAG (yttrium aluminum garnet) laser. The electron-paramagnetic-resonance spectrum from these hydrogen ato…
In order to reveal the band structure of cubic boron phosphide a photo- and electroreflectance study has been undertaken. Towards this end, epitaxial thin films of this III–V semiconductor are grown on silicon (100) by chemical vapor deposition. Both modulated reflectance techniques reveal a critical point at 4.25 eV.…
We report on specific-heat, magnetization, and ac-susceptibility measurements of ${\ensuremath{\beta}}^{\ensuremath{''}}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}{\mathrm{SF}}_{5}{\mathrm{CH}}_{2}{\mathrm{CF}}_{2}{\mathrm{SO}}_{3}$, an organic superconductor with ${T}_{c}=4.5$ K, where BEDT-TTF stan…
Here, we investigate various factors affecting the therapeutic efficacy of free doxorubicin (Free-Dox) and polyethylene glycol (PEG)-coated (PEGylated) liposomal doxorubicin (referred to as Doxil) in the ascitic J6456 lymphoma model of BALB/c mice. Free drug and liposomal drug were affected differently by the tumor bu…
The influence of alloy sulfur content and bulk solution composition on crevice corrosion initiation of type 304 (UNS S30400) stainless steel (SS) in neutral chloride solutions was determined experimentally, with particular emphasis on the solution chemistry that develops in the occluded region. Sulfide was the only di…
The corrosion behavior of copper, zinc, and their alloys in sulfuric acid (H2SO4) solutions with oxygen and ferric ions (Fe3+) was studied using a potentiostat. Oxygen and Fe3+ ions were shown to play an important role in corrosion of copper and copper-zinc alloys. Cathodic reduction of oxygen mainly was controlled by…
The formation of point defects in diamond induced by an energetic displacement of a carbon atom out of its lattice site and the relaxation of the thereby disrupted crystal are studied by molecular dynamics simulations with the Tersoff potential. The displacement energy for Frenkel pair creation is calculated to be 52…
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…