Materials Literature
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Abstract The spinodal decomposition in (Zn, Cr)Te is simulated by using first principles calculations and Monte Carlo simulation. It is found that the chemical pair interaction between Cr atoms in (Zn, Cr)Te is attractive interaction and leads to spinodal decomposition. Curie temperatures in decomposed situation are e…
Abstract The band structure of ternary chain TlInTe 2 was calculated with allowance for non‐locality of ionic pseudo‐potentials. The dielectric function, as well as the effective masses of holes and electrons, the effective number of valence electrons, and the function of characteristic losses were determined. The res…
Silicone based materials have attracted considerable attention from light emitting diode (LED) manufacturers for use as encapsulants and lenses for many high brightness LED (HB LED) devices. Currently silicones function in two key roles in HB LED devices, (1) as protective lenses and (2) stress relieving encapsulants…
Rare-earth oxyapatites MLn4Si3O13 (M = Ca, Sr, Ba Ln = La, Gd) have been proposed as a new plasma display panel (PDP) host material to overcome the problems of Zn2SiO4:Mn commercial green phosphor, such as luminance degradation and poor surface charge. Tb-doped MLn4Si3O13 phosphor powders show a green luminescence wit…
The published data on supramolecular complexes of porphyrins with optically active organic molecules are systematised. The key principles, mechanisms and driving forces of complexation and factors responsible for effective control over formation of supramolecular systems are considered.
The stable solid form of carbon is graphite; diamond is thermodynamically unstable at atmospheric pressure. High pressure and high temperature must be applied to enable diamond crystal growth. Cubic diamond grows when hydrostatic pressure is applied, whereas hexagonal diamond (which is another form of ${\mathrm{sp}}^{…
The nanocrystalline SrY2O4:Eu3+ was prepared by a poly(vinyl alcohol) (PVA)+glycine-assist combustion method. The results of x-ray diffraction indicate that the resulting SrY2O4:Eu3+ nanocrystals have much broader and less intense peaks compared with those in bulk material. The charge-transfer bands in SrY2O4:Eu3+ nan…
CuCrS2 has a nearly two-dimensional crystal structure, and is an insulator with antiferromagnetic ordering at T N = 40 K. We have prepared the substituted system described as CuCr1-x Vx S2. Powder x-ray diffraction patterns reveal that this system has a large solubility range of 0 ≤ x ≤ 0.9, within which single-phased…
The dispersion characteristics of asymmetric double-negative material slab waveguides have been investigated by using normalized parameters. The results show that the dispersion characteristics of these material waveguides differ dramatically from conventional guided waves, and they possess a number of unusual propert…
Abstract The surfaces of various mechanical pulp fibres, including thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), and alkaline peroxide mechanical pulp (APMP) fibres, were characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), and X‐ray photoelectron spectroscopy (XPS).…
Abstract This issue's Editor's Choice [1] reviews electronic and optical properties of various widegap oxychalcogenides which are connected to their crystal structures. Two examples are shown in the cover picture: Ln CuO Ch ( Ln = lanthanide, Ch = chalcogen, left) and La 2 CdO 2 Se 2 (right). These oxychalcogenides ha…
Electronic properties of single-walled carbon nanotubes intercalated with lithium are investigated by NMR. $^{13}\mathrm{C}$ NMR experiments reveal a metallic ground state for all of the following stoichiometries ${\mathrm{LiC}}_{x}$ with $x=10$, 7, and 6. A continuous increase of the density of states at the Fermi le…
The interaction forces between nanoscale colloidal particles coated with end-grafted Lennard-Jones homopolymers are calculated using off-lattice Monte Carlo simulations in the NVT ensemble. The focus of this work is on grafted polymers that are of approximately the same size as the nanoparticle, a regime intermediate…
Abstract This article describes progress towards producing prototype magnetoelectronic structures based on III–N semiconductor materials. We focus on the materials properties connected with the key physical phenomena underlying potential spintronic devices: producing, injecting, transporting, manipulating and detectin…
Abstract The electronic structures of the ternary thallium chalcogenide compounds, TlGaSe 2 and TlGaS 2 are studied, using the linear muffin‐tin orbital (LMTO) method. The calculated band dispersion shows that both compounds are indirect gap semiconductors. For both compounds, the top of the valence bands is located a…
We study the motion of two colloidal (‘probe’) particles translating along their line of centres with fixed, equal velocities in an otherwise quiescent colloidal dispersion. The moving probes drive the microstructure of the dispersion out of equilibrium; resisting this is the Brownian diffusion of the dispersion ‘bath…
We have investigated nanoscale compositional and structural variations in Ce(0.5)Zr(0.5)O(2) samples with different redox properties. Different samples were prepared using a spray freezing technique, and the synthesis conditions were varied to yield materials with reduction temperatures in the range of 400-750 degrees…
Using quantitative fluorescence microscopy in conjunction with a method of gradient substrate assembly established in their group, the authors were able to introduce and measure reproducible changes in cellular morphology and cell density by manipulating polymer grafting density. The mechanism behind this change in ce…
Abstract Electronic and optical properties of widegap oxychalcogenides, LaCuO Ch ( Ch = chalcogen) and La 2 CdO 2 Se 2 , are reviewed with a focus on those relevant to their layered crystal structures, including high hole mobility, degenerate p‐type conduction, room temperature exciton, and large third order optical n…
The dynamics of water (${\mathrm{H}}_{2}\mathrm{O}$ and ${\mathrm{D}}_{2}\mathrm{O}$) molecules adsorbed inside single-wall carbon nanotubes (SWCNTs) of average diameter $13.5\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ were investigated by means of $^{2}\mathrm{H}$- and $^{1}\mathrm{H}$-NMR between 100 and $300\phantom…