Materials Literature
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The authors report the changes that are included in the revised Standard IEEE-519. In order to better understand what the standard means in practical terms, two applications of the standard are discussed in detail: a large industrial plant furnished at transmission voltage and several users on a single distribution fe…
Sb4: The building block of a new solid-state modification of antimony. This is a somewhat provocative description of the fact that nanocrystalline structures of Sb4 tetrahedrons exist on the substrates AuSb2(100) and MoS2(0001). Scanning tunneling microscopy images (see picture, (a) and (b), respectively, each 39×39 Å…
We studied the charge ordering transition of LiMn 2 O 4 by means of anelastic spectroscopy, measuring the Young’s modulus, E ′ , and the elastic energy loss function, Q −1 . Our measurements confirm the occurrence of a phase transition at 296 K on cooling, showing a large hysteresis on heating. The anelastic spectrosc…
It was observed that a ferroelectric domain boundary (DB) is always accompanied by an antiferromagnetic DB in hexagonal YMnO 3 , by means of interference effects of the second-harmonic signal. The clamping of these two order parameters at the ferroelectric DB is shown theoretically to originate from Dzyaloshinski–Mori…
The discovery of ordered but aperiodic quasicrystal structures has required the development of new diffraction methods to determine their structures. The purpose of this review is to highlight the challenges posed by the aperiodicity of quasicrystals to the study of their surface structures by low-energy electron diff…
Biomolecules have been attached to porous silicon by a new linking method that forms a direct Si-C bond on the surface and retains the photoluminescence of the porous silicon.
A lyotropic AgNO3, HAuCl4 and H2PtCl6–silica liquid crystalline (LC) phase is used as a supramolecular template for a one-pot synthesis of novel noble metal or complex ion containing nanocomposite materials in the form of a film and monolith. In these structures, Ag+, AuCl4− and PtCl62− ions interact with the head gro…
In the framework of the perturbation theory for fluids we study the model with the isotropic repulsive step potential which in addition to the hard core has a repulsive soft core of a larger radius. It is shown that this purely repulsive potential is sufficient to explain a liquid-liquid phase transition and liquid an…
Y 2 O 3 :Eu 3+ and Li-doped Y 2 O 3 :Eu 3+ luminescent thin films have been grown on sapphire substrates using a pulsed laser deposition technique. The thin-film phosphors were deposited at a substrate temperature of 600 ° C under the oxygen pressures of 100, 200, and 300 mTorr. The films grown under different deposit…
It is well known that water molecules surrounding a protein play important roles in maintaining its structural stability. Water molecules are known to participate in several physiological processes through the formation of hydrogen bonds. However, the hydration structures of most proteins are not known well at an atom…
In situ neutron diffraction experiments have been carried out to study the kinetics of the transformation of high-density amorphous (HDA) water into its low-density amorphous state at temperatures 87 K ≤ T ≤ 110 K. It is found that three different stages are comprised in this transformation, namely an annealing proces…
In order to develop an optical absorber for use in the measurement of optical power, the authors investigated and evaluated ultra-black films of nickel-phosphorus alloy, which were plated and etched on substrates using an electroless plating process. The plating and etching bath components and conditions were examined…
A series of novel fullerene–ferrocene derivatives has been synthesized and their NLO properties investigated. Ferrocene acts as a donor and fullerene as a good acceptor, leading to large hyperpolarizabilities, especially in the case of the compound with the longest π-conjugation system, which exhibits the highest β va…
Highly ordered mesoporous inorganic-organic hybrid thin films with covalently bonded carboxylic acid (-COOH) terminal groups on the pore surfaces were synthesized by evaporation induced self-assembly of tetraethoxysilane, organosilanes, and a nonionic surfactant followed by acid hydrolysis and characterized using tran…
Poly(styrene sulfonate)–Zn2Al(OH)6·nH2O (PSS–LDH) layered double hydroxide nanocomposites have been prepared by the polymer templating method or by an exchange reaction followed by in situ polymerization of the monomers. The two well-defined samples were characterized by a combination of techniques and the polymerizat…
The properties of Ce 3+ in CaBPO 5 , LiCaPO 4 and Li 2 CaSiO 4 have been studied in the 100–400 nm wavelength region with time resolved spectroscopy at temperatures between 10 and 300 K. Emphasis is on the relationship between the energies of the five 5d levels of Ce 3+ and the crystalline environment. Good agreement…
Wheels with high spins: The reaction of a tridentate Schiff base ligand with iron(II) chloride, and subsequent oxidation with [(tBu4N)MnO4] yielded a heptanuclear mixed-valent iron wheel (see picture) with a spin ground state of S=29/2.
${\mathrm{Ba}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnReO}}_{6}$ $(x=0,$ 0.5, 1, 2) phases with a double-perovskite structure were prepared by solid-state techniques in evacuated sealed silica tubes. ${\mathrm{Mn}}^{2+}$ and ${\mathrm{Re}}^{6+}$ are virtually completely ordered on the B sites. The compounds are…
Using a first-principles approach, we calculate Raman spectra for a model structure of vitreous silica. We develop a perturbational method for calculating the dielectric tensor in an ultrasoft pseudopotential scheme and obtain Raman coupling tensors by finite differences with respect to atomic displacements. For frequ…
A ferroelectric crystal $[4\ensuremath{-}{\mathrm{NH}}_{2}{\mathrm{C}}_{5}{\mathrm{H}}_{4}\mathrm{NH}][{\mathrm{SbCl}}_{4}]$ has been synthesized. The x-ray diffraction studies indicate that it is made of polyanionic chains of $({\mathrm{SbCl}}_{4}^{\ensuremath{-}}{)}_{n}$ forming a tunnel-like structure and the 4-ami…