Materials Literature
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Galena (PbS) is a major ingredient in ancient Egyptian eye makeup. The microstructure of PbS in Egyptian cosmetic powders is used as a fingerprint and is matched with the microstructures produced artificially in geological galena minerals. The microstructure of PbS is determined by x-ray diffraction peak profile analy…
The results of studies of the preparation, structure, and optical properties of undoped and Gd-doped CeO2 thin films are presented. Dense films with 4–150 nm grain size have been obtained on monocrystalline sapphire substrates using a polymeric precursor spin coating method. The results of the optical measurements are…
The critical behavior of the double perovskite ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ (SFMO) is investigated by measurements of the magnetization $(M),$ susceptibility $(\ensuremath{\chi}),$ and temperature derivative of the resistivity $(d\ensuremath{\rho}/dT),$ the last of which has the same critical exponent as th…
2,9,16,23-Tetrakis(2-pyrrol-1-ylalkoxy)phthalocyanines, in which the phthalocyanine is connected via an alkylene spacer to a pyrrole substituent, are prepared via three steps in good yields. For the first time monomers with groups for electropolymerisation electronically isolated from the phthalocyanine are described.…
Graphitization of {100} and {111} faces of diamond crystals at pressures of 0.1 and 2 GPa and various temperatures was studied by Raman spectroscopy, x-ray single crystal diffractometry, and scanning electron microscopy. Different primary mechanisms of graphitization are discussed: (a) normal growth of graphite layer…
A short-circuited solid-state battery: A novel silveroxonickelate with the apparently innocent composition Ag2NiO2 (see structure: silver: white, nickel: dark gray, fluorine: black) shows a surprising charge distribution: subvalent silver atoms exist adjacent to rather highly oxidized nickel(III) centers. The compound…
Attempts to prepare heterobimetallic complexes in which 3d and uranium magnetic ions are associated by means of the Schiff bases H(2)L(i) derived from 2-hydroxybenzaldehyde or 2-hydroxy-3-methoxybenzaldehyde were unsuccessful because of ligand transfer reactions between [ML(i)] (M=Co, Ni, Cu) and UCl(4) that led to th…
Thermoelectric oxides with comparatively high figures of merit possess layered structures. Because they exhibit thermoelectric anisotropy, textured crystal-axis-oriented ceramics should be produced in order to realize the best performance. We have succeeded in fabricating textured ceramics of yttrium-substituted (ZnO)…
A Raman scattering study of the phase transitions in SrTiO3 and in the mixed system (Sr1-xCax)TiO3 at ambient pressure from T = 300 K down to 8 K, R Ouillon, J-P Pinan-Lucarre, P Ranson, Ph Pruzan, Sanjay Kumar Mishra, Rajeev Ranjan, Dhananjai Pandey
Thermal conductivities of hydrogen-silsesquioxane thin films---Dow Corning ``flowable oxide'' and nanoporous ``extra-low-$k''$ spin-on dielectrics---are measured in the temperature range 80--400 K using the $3\ensuremath{\omega}$ method. Film thickness and atomic densities are characterized by the combination of Ruthe…
BaTiO 3 (BTO)/SrTiO3 (STO), and BaTiO3/BaZrO3 (BZO) artificial superlattices were fabricated by the molecular beam epitaxy process and their dielectric properties and refractive indices were measured. Superlattices formed on Nb-doped STO substrates showed large leakage currents in comparison with those on pure STO sub…
The electrical conductivity of molten salt has been theoretically investigated starting from the linear response theory in view of a microscopic point. The velocity correlation functions in molten salt are expressed in terms of pair potentials and pair distribution functions in detail. Using these functions and genera…
Abstract A two‐part study utilizing isotactic poly(4‐methyl‐1‐pentene) (PMP) was undertaken to investigate a three‐stage process (melt‐extrusion/annealing/uniaxial stretching) (MEAUS) utilized to produce microporous films. In this report, the thermal‐annealing (second stage) and subsequent uniaxial‐stretching (third s…
The theory presented in this article successfully reproduces and explains the experimental magnetostriction and magnetization hysteresis behavior of Tb0.3Dy0.7Fe1.9. It is well known that a very large number of individual domain wall translation events combine to produce each measurable domain transformation in a macr…
A governing parameter, called AFDgen*, which reflects electromigration damage in a polycrystalline line covered with a passivation layer is proposed. The formulation is based on the parameter AFDgen previously introduced in our studies. With the help of AFDgen we can calculate the atomic flux divergence due to electro…
Computer simulations of bubble oscillations in aqueous methanol solution are performed under conditions of sonoluminescence (SL) in order to study the mechanism of SL quenching by methanol reported by Ashokkumar et al. [J. Phys. Chem. B 101, 10849 (1997); J. Phys. Chem. A 104, 8462 (2000)]. It is shown that methanol m…
Two novel Mn(II) coordination polymers [Mn(N3)2(bbp)2]n1 and {[Mn(NCS)2(bbp)2]·0.25H2O}n2 (bbp = 4,4′-trimethylenedipyridine) with 2D double-sheet layered structures were obtained by a normal synthesis method at room temperature. Interestingly, each layer contains two sheets; the double-sheet layer is formed around an…
Copper ferrite (CuFe2O4) thin films have been prepared by rf sputtering on fused quartz and silicon (111) substrates at ambient temperature. The as-deposited film is found to be in cubic phase, which is stable only at higher temperatures in bulk. The films were annealed at temperatures ranging from 100 °C to 800 °C an…
Using the density-functional electronic-structure calculations, we study so-called zig-zag carbon nanotubes. From the complete geometry optimization, it is found that two kinds of bond lengths are considerably different from each other. They possess strong tube-diameter dependence. We determine the bond lengths up to…
Dielectric and Piezoelectric Properties of High Curie Temperature Single Crystals in the Pb(Yb1/2Nb1/2)O3–xPbTiO3 Solid Solution Series, Zhang, Shujun, Rhee, Sorah, Randall, Clive A., Shrout, Thomas R.