Materials Literature
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We have investigated electronic and magnetic properties of the pyrite-type ${\mathrm{CoS}}_{2}$ using the linearized muffin-tin orbital band method. We have obtained the ferromagnetic ground state with nearly half-metallic nature. The half-metallic stability is studied by using the fixed spin moment method. The non-ne…
Epitaxial cobalt ferrite thin films provide a model system for understanding the magnetic properties of spinel structure ferrite thin films. We demonstrate that the anomalous magnetic behavior, observed in our antiphase-boundary-free films, can be explained in terms of cation distribution and lattice distortions. The…
Abstract One of the most important phenomenon in material science is the reinforcement of rubber by rigid entities, such as dispersed particulate filler or phase-separated organic domains. In order to impart significant reinforcement, the size of the hard phase must be small, much less than a micron. The basis of this…
The search for inorganic ion exchangers that would be stable to ionizing radiation and elevated temperatures began with the advent of nuclear technology in the 1940's. Research has continued unabated since then producing many dozens of such compounds both synthetic and natural. Several of the important groups of these…
Carbon nanotubes, a kind of high order fullerenes, offers remarkable electronic as well as mechanical properties, e.g., an extremely high Young’s modulus of TPa order has been reported. This suggests the suitability of carbon nanotubes as novel fiber materials for metal matrix composites. The authors demonstrate that…
On the basis of theoretical calculations, Andersson & Hovmöller have recently suggested that the long-established value of 1.35 g cm(-3) for the mean density of proteins should be revised to 1.22 g cm(-3) [Andersson & Hovmöller (2000), Acta Cryst. D56, 789-790]. To substantiate their assertion, these authors used the…
Two cyclometallated Ru(bpy)2(pp) units (bpy = 2,2′-bipyridine; pp = 2-phenylpyridine) were grafted via ethynyl spacers onto the photochromic cores of the norbornadiene or dithienylethene families, to give the bimetallic ruthenium(II) complexes 1 and 2a, respectively. Two aspects of these compounds were studied: (i) ph…
A new X-ray crystallographic beamline is operational at the MAX II synchrotron in Lund. The beamline has been in regular use since August 1998 and is used both for macro- and small molecule diffraction as well as powder diffraction experiments. The radiation source is a 1.8 T multipole wiggler. The beam is focused ver…
We present a detailed characterization of energy transfer processes in ${\mathrm{Er}}^{3+}$-doped and ${\mathrm{Er}}^{3+}{,\mathrm{P}\mathrm{r}}^{3+}$-codoped ZBLAN bulk glasses. For several ${\mathrm{Er}}^{3+}$ (0.25--8.75 mol%) and ${\mathrm{Pr}}^{3+}$ (0.25--1.55 mol%) concentrations, we investigate energy transfer…
This paper explores equivalent formulations of the polarization ordering first proposed by Foster and Wolfson. Motivated by the class of polarization indices proposed by Foster and Wolfson, we have developed a class of generalized Foster‐Wolfson indices. In addition, a new class of polarization indices satisfying a se…
We made direct force measurements by atomic force microscopy (AFM) at surfaces of polymer brushes comprised of low-polydispersity poly(methyl methacrylate) (PMMA) chains densely end-grafted on a silicon substrate by living radical polymerization. These brushes are characterized by an exceptionally high, nearly constan…
New materials for nonlinear optical (NLO) applications are still of great interest. The monoclinic BiB3O6 (BIBO) shows exceptionally large NLO coefficients. In this article we will present the linear optical properties in the wavelength range between 350 and 2400 nm, the phase matching conditions calculated for second…
Abstract The shape of a crystalline organic solid has a major impact on its downstream processing and on its end‐product quality, issues that are becoming increasingly important in the specialty and fine chemical, as well as the pharmaceutical and life science, industries. Though it is widely known that improved cryst…
In this article, we report the successful growth of Ba(Ti1−xZrx)O3 (x=0.05–0.2) single-crystal fibers by the laser-heated pedestal growth technique. A single-phase perovskite structure of the materials has been identified by the x-ray diffraction technique. The phase diagram for Ba(Ti1−xZrx)O3 single crystals is estab…
Poly(methyl methacrylate) (PMMA) brushes with the same chain length but different graft densities were prepared on a silicon substrate by the surface-initiated atom transfer radical polymerization technique. The graft density σ was changed in a wide range extending to an exceptionally high value (0.07 < σ (chains/nm 2…
The electromagnetic interference (EMI) shielding efficiency (SE) is measured for conductive polyaniline and its mixtures containing conducting powders. The frequency ranges of the EMI SE is 10 MHz–1 GHz by using the ASTM D4935-89 technique. The EMI SE of hydrochloric acid doped polyaniline containing silver (Ag) powde…
The presence of space charge in the polymeric insulation of high-voltage cables is correlated with electric breakdown. There is a vast literature concerned with the experimental characterization of space charge and with phenomenological models of space charge formation and discharge. However, a direct link between mol…
This paper examines the prospects for quantifying disorder in simple molecular or colloidal systems. As a central element in this task, scalar measures for describing both translational and bond-orientational order are introduced. These measures are subsequently used to characterize the structures that result from a s…
The crystal and magnetic structures of ${\mathrm{CaFeO}}_{3}$ have been determined at 300 and 15 K using synchrotron x-ray and neutron powder-diffraction techniques. At 300 K, ${\mathrm{CaFeO}}_{3}$ adopts the ${\mathrm{GdFeO}}_{3}$ struture, space group Pbnm with unit-cell dimensions $a=5.32630(4),$ $b=5.35270(4),$ a…
Three series of polycrystalline spinel ferrite, Ni–Zn ferrite, Mg–Zn ferrite and Ni–Zn–Cu ferrite, were prepared by the usual ceramic sintering method. The complex permeability spectra of each were measured. The low-frequency permeability increases with zinc content. However, the natural resonance frequency shifted do…