Materials Literature
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The dielectric properties of MnxNi0.5−xZn0.5Fe2O4 ferrites with x varying from 0.05 to 0.4 synthesized by the citrate precursor method have been investigated as a function of frequency, temperature, composition, and sintering temperature. An increase in the dielectric constant is observed with the increase in Mn conce…
Abstract This paper provides a review of a systematic micro‐Raman scattering study on various lead‐ and barium‐based ABO 3 perovskites (A = Pb, La, Ba, Sr, Ce, Gd, Nd and B = Ti, Zr), Aurivillius‐type Bi‐layered compounds (SrBi 2 Ta 2 O 9 , Bi 4 Ti 3 O 12 ) and their solid solutions useful in a broad range of device a…
A range of Ni–Mn–Ga alloy compositions close to the stoichiometric Heusler composition, Ni2MnGa, has been reported to show field-induced strains of several percent. Such observations, and the magnitude of the strain observed, depend on the values of several critical material parameters, most importantly the martensiti…
The intercalation of large organic ammonium ions (tetramethylammonium ions (TMA + ), tetraethylammonium ions (TEA + ), tetrapropylammonium ions (TPA + ), and tetrabutylammonium ions (TBA + )) into layered graphite oxide (GO) was systematically investigated. The intercalation reactions were completed at 25 °C after 3 d…
A cobalt molecule that functions as a single-molecule magnet, [Co4(hmp)4(MeOH)4Cl4], where hmp− is the anion of hydroxymethylpyridine, is reported. The core of the molecule consists of four Co(II) cations and four hmp− oxygen atom ions at the corners of a cube. Variable-field and variable-temperature magnetization dat…
The increasing awareness of the need to create green and sustainable production processes in all fields of chemistry has stimulated materials scientists to search for innovative catalysts supports. These new catalytic supports should allow the heterogenization of most catalytic processes, increasing the efficiency and…
A broad classification scheme is proposed for half-metallic ferromagnets which embraces the possibilities of itinerant and localized electrons, as well as semimetallic and semiconducting electronic structure. Examples of each type are given. The problems of defining and measuring spin polarization are discussed and so…
A topological anomaly present at zero energy is shown to give rise to a peculiar and singular behavior of the dynamic and static conductivity in two-dimensional honeycomb lattices. A calculation in a self-consistent Born approximation reveals that this singular dependence prevails although being somewhat smoothed out…
Nanoparticles of LaF 3 doped with Ln 3+ (Ln = Eu, Er, Nd, and Ho) have been prepared that are dispersible in organic solvents. From the spectrum of Eu 3+ it has been concluded that the dopant ion occupies a La 3+ site. The luminescence decays are fitted biexponentially. A given possible explanation for this is a diffe…
LCSL
Transmission electron microscopy analysis of self-ordered porous alumina obtained by electrochemical anodization shows that self-ordering requires a porosity of 10%, independent of the specific anodization conditions. This corresponds to a volume expansion of alumina to aluminum of about 1.2. We propose that self-orde…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Neodymium doped phosphate glasses have been prepared by the semi-continuous melting technique. Their absorption and emission spectra have been recorded at room temperature. The Judd-Ofelt theory has been applied to evaluate the stimulated emission cross sections of 4 F 3/2 → 4 I 11/2 transition for Nd 3+ . The higher…
Abstract The melting behavior and crystallization kinetics of poly(2‐hydroxyethoxybenzoate) (PHEBA) were investigated with differential scanning calorimetry and hot‐stage optical microscopy. The observed multiple endotherms, commonly displayed by polyesters, were influenced by the crystallization temperature. By the a…
The temperature dependence of lattice constants a and c of intermetallic compounds R Mn 2 Ge 2 ( R = Sm, Gd) is measured in the temperature range 10-800K by using the x-ray diffraction method. The magnetoelastic anomalies of lattice constants are found at the different kinds of spontaneous magnetic transitions. The tr…
Extended X-ray absorption fine structure (EXAFS) spectroscopy and transmission electron microscopy (TEM) have been used to investigate Ni/Co bimetallic nanoparticles (bi-MNPs) in carbon species such as single-walled carbon nanotubes (SWNTs) produced via laser vaporization of a carbon−metal mixture. Results from select…
In this study, we systematically investigated 39 secondary amines as additives in concentrated EB/NMP solutions for gelation and degradation. We discovered that when both the width (defined as the longest distance between two hydrogens in the plane perpendicular to the NH bond of the amine) and depth (defined as the l…
A carboxylic acid-substituted picolinic hydrazone ligand (pcoap) forms a homoleptic [2 × 2] tetranuclear Cu(II)4 complex with four six-coordinate Cu(II) centers bridged by μ-O alkoxide groups in a square grid structure. The terminal carboxylic groups complete the six-coordinate structures at each copper centre, cappin…
We study transient drop deformation in dilute emulsions for large values of the capillary number Ca . We consider steady planar linear flows characterized by the dimensionless vorticity β. For drop-to-matrix viscosity ratios λ < 1, we find that the drops are strongly elongated by the extensional component of the flow…
Novel poly(ester−urethane) block copolymer has been synthesized by use of telechelic hydroxylated poly-[( R )-3-hydroxyoctanoate] (PHO-diol) with number-average molecular weight ( M n ) of 2400 as the amorphous soft segment, telechelic hydroxylated poly-[( R )-3-hydroxybutyrate] (PHB-diol) with M n of 2600 as the crys…