Materials Literature
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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…
A nonlithographic technique that utilizes highly ordered anodized aluminum oxide porous membrane as template is presented as a general fabrication means for the formation of an array of vastly different two-dimensional lateral superlattices structures. Hexagonal close-packed nanopore arrays were fabricated on Si, GaAs…
The fundamental optical absorption of Cs 4 PbBr 6 crystals, which are built up of nearly regular Pb 2+ (Br - ) 6 octahedra mutually bound by Cs + ions, exhibits novel features: despite the crystalline entity of Cs 4 PbBr 6 , it shows oscillator-like absorption peaks and a wide window just above the first peak. The Cs…
Magnetische Lawinen: Ein chiraler, polymerer Mangan(II)-Komplex mit einem enantiomerenreinen Nitronylnitroxid-Liganden (siehe Struktur der Wiederholungseinheit; O rot, N grün, Mn blau) zeigt ungewöhnliches magnetisches Verhalten. Bei 3 K liegt im Festkörper magnetische Ordnung vor, unterhalb von 0.3 K jedoch wurden dy…
Magnetic avalanches: A chiral polymeric manganese(II) complex with an enantiopure nitronyl nitroxide ligand (see structure of repeating unit; red: oxygen, green: nitrogen, blue: manganese) shows unusual magnetic behavior. The polymer orders magnetically in the bulk at 3 K, and reveals unusual dynamic and hysteretic ma…
We present a new method, in the following called MMM2D, to accurately calculate the electrostatic energy and forces on charges being distributed in a two dimensional periodic array of finite thickness. It is not based on an Ewald summation method and as such does not require any fine-tuning of an Ewald parameter for c…
The mean-field Landau-type theory is used to analyze the polarization properties of epitaxial ferroelectric thin films grown on dissimilar cubic substrates, which induce biaxial compressive stress in the film plane. The intrinsic effect of the film surfaces on the spontaneous polarization is taken into account via the…