Materials Literature
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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.
We investigate the residual stress in diamond films grown on (001) silicon substrates as a function of film thickness. The diamond films were deposited at 1070 K by the conventional hot filament technique using a gas mixture of methane (1.0% vol) and hydrogen (99.0% vol). The film thickness, obtained from cross sectio…
We report about the band-gap tuning of PbS nanoparticles by in-flight sintering of size-classified aerosols. Band gaps in the range of 0.5–2.0 eV were obtained. The band gap first decreases and then increases upon increasing the sintering temperature. The decrease in the band gap is associated with the sintering of pr…
Spectral properties of blue upconversion luminescences in Tm3+ doped tellurite (PWT, PbF2-WO3-TeO2) glasses and germanate (PWG, PbF2-WO3-GeO2) glasses pumped by a tunable dye laser were studied at room temperature. Two emission bands centered at 453 and 477 nm, corresponding to the D21→H43 and G41→H63 transitions of T…
Antiferroelectric behavior is observed in artificially layered KTaO (3)/KNbO (3) perovskite superlattices. While KTaO (3) and KNbO (3) are ferroelectric and paraelectric, respectively, the superlattice appears antiferroelectric based on an increase in the dielectric constant with applied dc bias. This dielectric behav…
Electronic structures of the hexagonal ${\mathrm{Ti}}_{2}\mathrm{AlC}$ and ${\mathrm{Ti}}_{2}\mathrm{AlN}$ compounds with ${\mathrm{Cr}}_{2}\mathrm{AlC}$-type structure calculated within the full-potential linearized augmented plane-waves formalism are presented. Geometrical optimization of the unit cell are in good a…
The development of a sensitive porous silicon (PS) gas sensor which utilizes photoluminescence induced electroless metallization as a means of obtaining a highly efficient electrical contact has been demonstrated for the detection of HCl, NH3, and NO at the 10 ppm level. The problem of spreading resistance (kΩ–MΩ) is…
The phase distribution of high aspect ratio, Fe-filled carbon nanotubes prepared by pyrolyzing a mixture of powered ferrocene and ${\mathrm{C}}_{60}$ has been determined by means of M\"ossbauer spectroscopy. Our results for that characterization are closely related to the observation, after field cooling processes, of…