Materials Literature
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We calculate magnetization in magnetically doped semiconductors assuming a local exchange model of carrier-mediated ferromagnetic mechanism and using a number of complementary theoretical approaches. In general, we find that the results of our mean-field calculations, particularly the dynamical mean-field theory resul…
It has been shown that a water drop can bounce persistently, when thrown on a super-hydrophobic substrate. We present here scaling arguments which allow us to predict the maximal deformation and the contact time of the drop. This approach is completed by a model describing the flow inside the drop, and by original exp…
High molecular mass poly(lactide), (PLA), is an attractive polymer family because in addition to being thermoplastic, biodegradable, compostable, and produced from annually renewable resources, it shows mechanical and barrier behavior comparable to synthetic polymers like polystyrene (PS) and polyethylene terephthalat…
Short circuit currents or forces during transport can cause mechanical displacements of transformer windings. The transfer function method is presented as a tool to detect these displacements. In order to be able to evaluate the measurements, the correlation between the characteristics of transfer functions and possib…
Abstract Bulk gold is chemically inert and is generally regarded as a poor catalyst. However, when gold is in very small particles with diameters below 10 nm and is deposited on metal oxides or activated carbon, it becomes surprisingly active, especially at low temperatures, for many reactions such as CO oxidation and…
The structure of Ba2CoSi2O7 consists of layers made from corner-sharing of [SiO4] and [CoO4] polyhedra. These layers, lying parallel to (001), are linked by Ba⋯O interactions. Co2+ forms flattened CoO4 tetrahedra (point symmetry \overline 4), which are isolated in the structure. The blue color of the solid might be ex…
The viscous drag of dislocations is known to increase when a phase transition of the host material is approached. Previous discussions of this effect, however, have overlooked that, above the bulk transition point, the ordered phase can already nucleate along the dislocations. The viscous-drag component due to energy…
The optical absorption spectra of BaF 2− x Cl x :Eu in different states of optical storage were measured to clarify the electron trapping mechanism for its optical storage and photo-stimulated luminescence (PSL). Based on the absorption spectra and difference absorption spectra, the electron transfer processes after u…
The crystal structures of the two polytypes of the compound CaMgB 2 O 5 , kurchatovite and clinokurchatovite, were determined in the space groups Pc2 1 b and P2 1 /c respectively by Yakubovich et al. (1976) and Simonov et al. (1980). The crystal structures of both minerals have been re-examined and refined until R obs…
Density functional theory (DFT) methods, as implemented in the Amsterdam Density Functional program, are used to calculate the electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR) parameters of ${\mathrm{S}}_{2}^{\ensuremath{-}},$ ${\mathrm{SSe}}^{\ensuremath{-}},$ and ${\mathrm{Se}}_{2}…
Abstract Three model 2,4,6‐tris(amino)‐1,3,5‐triazines, structurally related to a dyestuff molecule previously studied by NMR, were synthesized in order to enable the effects of rotamer exchange on the NMR spectra to be investigated in more detail. Two of the compounds are novel. Internal rotation of the triazine ring…
$X$-band ESR of lithium doped ${\mathrm{MoS}}_{2}$ nanotubes is reported for temperatures between room temperature and 4 K. Two distinct ESR components were observed: a narrow component with a linewidth of about 4 G and a broad component with a linewidth of more than 800 G. The broad ESR component is attributed to Mo…
We have undertaken a systematic study of thermal conductivity as a function of temperature and magnetic field of single crystals of the compound $({\mathrm{La}}_{1\ensuremath{-}z}{\mathrm{Pr}}_{z}{)}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ for $z(\mathrm{Pr})=0.2,0.4,$ and 0.6. The lattice distortio…
Data on the kinetics and mechanism of the three-dimensional radical polymerisation of multifunctional vinyl monomers (oligomers) containing two (or more) double bonds are generalised and analysed. The history of this field of research is briefly outlined. The characteristic feature of the mechanism of three-dimensiona…
Chemical analyses and crystal structure refinements were performed on lithian siderophyllite-3 T crystals from granitic pegmatites of the anorogenic Pikes Peak batholith (Colorado) to characterize the crystal chemistry and relations with trioctahedral lithium-bearing micas showing different stacking sequences. Chemica…
The nonlinear dielectric response of ${\mathrm{SrTi}}^{18}{\mathrm{O}}_{3}$ is measured as a function of temperature and dc bias field strength. In the low-field region the nonlinearity coefficient ${\ensuremath{\chi}}_{3}/{\ensuremath{\chi}}_{1}^{4}$ is found to strongly decrease when approaching ${T}_{c}\ensuremath{…
The crystal structure of octaguanidinium alpha-silicodiplatinodecatungstate hexahydrate, (CH(6)N(3))(8)[alpha-SiPt(2)W(10)O(40)].6H(2)O, has been analyzed via a high-energy X-ray diffraction experiment at the SPring-8 BL04B2 beamline. The title compound contains a novel alpha-Keggin heteropolyanion in which two of the…
Heat capacities of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3\ensuremath{-}\ensuremath{\delta}}$ $(0<~x<~0.5)$ were measured in a temperature range of 1.8--300 K and in magnetic fields of 0 and 9 T. In $x>~0.3,$ a clear heat capacity anomaly was observed due to a paramagnetic-to-ferro…
Abstract An in situ bubble‐stretching (ISBS) model has been proposed on the basis of an analysis of the dispersion process of inorganic additives in polymers. The ISBS model is applicable to a dispersion of solid granular aggregates in polymer melts because the dispersed phase itself serves as a nucleation agent, givi…
A new occurrence of katoite (Ca2.95Fe0.03A12.03(SiO4)1.12(OH)7.51; a = 12.286) found near Dunabogdany (Hungary), along with its structural refinement is reported here. The crystal-chemical data, the physical properties, and the structure refinement of this new member of the Ca3Al2(SiO4)3-Ca3Al2(O4H4)3 series indicate…