Materials Literature
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A phosphor Sr 5 (PO 4 ) 3 Cl, doped with Eu 2+ is reported. This is shown to be at least twice as sensitive as the conventional CaSO 4 :Dy phosphor used in thermoluminescence dosimetry of ionizing radiations. It has a linear response, simple glow curve, emission peaking at 456 nm, negligible fading and excellent reusa…
The valence compensated solid solution Sr 0.65 La 0.35 Ti 0.65 Co 0.35 O 3 has been found to exhibit dielectric relaxor behaviour with a very high value of the dielectric constant. In the present investigation, this composition has been prepared using different processing parameters and routes, viz (a) solid-state sin…
This paper summarizes an effect of trans−cis photoisomerization of a chiral azobenzene compound on a phase structure of the compensated nematic liquid crystal (LC) consisting of the chiral azobenzene compound, nonphotochromic chiral compound with opposite twisting ability, and a host nematic LC. The trans−cis photoiso…
We develop a theory of nucleation on top of two-dimensional islands bordered by steps with an additional energy barrier $ΔE_S$ for descending atoms. The theory is based on the concept of the residence time of an adatom on the island,and yields an expression for the nucleation rate which becomes exact in the limit of s…
We present the results of a Monte Carlo simulation of the ground state and magnetic relaxation of a model of a thin film consisting on a two-dimensional square lattice of Heisenberg spins with perpendicular anisotropy K, exchange J and long-range dipolar interactions g. We have studied the ground state configurations…
Synchrotron-based high-resolution photoemission and X-ray absorption near-edge spectroscopy (XANES) have been used to study the interaction of NO 2 with polycrystalline surfaces of metallic zinc and zinc oxide. NO 2 exhibits a complex chemistry on metallic zinc. After adsorbing nitrogen dioxide, N, O, NO, NO 2, and NO…
The purpose of this work is the development of a method for the in-situ detection of chemicals in sea water. Raman scattering was chosen as it is a non-intrusive method yielding finger-printing spectra of the analytes. Surface-enhanced Raman scattering (SERS) is used to provide the sensitivity necessary for trace anal…
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…
A mechanism which may be responsible for the anomalies in the behaviour of type II ferroelectrics near the lock-in transition is considered. The state of the system is suggested to be quasistationary. The defects of the incommensurate modulation wave are found to play an important role and give additional contribution…
CLASSICAL DYNAMICS OF A CRYSTAL LATTICE. Vibrations of Monatomic Lattices. Models of Crystals of Various Dimensions. Vibrations of Polyatomic Lattices. Frequency Spectrum and Its Relation to the Green Function. Nonlinear Dynamics of One-Dimensional Crystals. QUANTUM MECHANICS OF CRYSTALS. Quantization of Crystal Vibra…
A continuous mesoporous silica film with uniaxially aligned hexagonal mesochannels was formed on a silica glass substrate using a rubbing-treated thin polyimide coating on the substrate. Polyimide which has a hexamethylene group per the repeating unit as a part of the main chain was used. The mesostructured silica fil…
For a deuterated solid solution of 15% antiferroelectric betaine phosphate (BP) and 85% ferroelectric betaine phosphite (BPI), measurements of the dielectric permittivity at frequencies 20 Hz< <1 MHz are reported. The freezing phenomena in DBP 0.15 DBPI 0.85 reveal the characteristics of a transition into a dipolar gl…
The dielectric dispersion of the transparent relaxor ferroelectric ceramics PLZT 8/65/35 and 9.5/65/35 was determined in a wide frequency range including the microwave and infrared range. The number of observed polar phonons in infrared spectra gives evidence about the locally broken cubic symmetry and the presence of…
A finite-difference time-domain method for light wave propagation through a liquid crystal cell containing a twisted/tilted deformation profile is presented. Our interest is focused on deformation profiles that correspond to the commonly encountered domain walls found in ferroelectric liquid crystal (FLC) devices. The…
We describe a Monte Carlo simulation study of the magnetic phase diagram of diluted magnetic semiconductors doped with shallow impurities in the low concentration regime. We show that because of a wide distribution of interaction strengths, the system exhibits strong quantum effects in the magnetically ordered phase.…
The character of the ferroelectric domains in lead zirconate titanate (PbZr 1- x Ti x O 3 - PZT) ceramics has been studied using transmission electron microscopy (TEM) for compositions right across the rhombohedral phase ( x = 0.06 to x = 0.45). The polarization hysteresis has also been determined for the same specime…
We present a semi-analytical model that quantitatively predicts the transmission, the absorption and the resonance locations of one-dimensional lamellar metallic gratings with subwavelength slit apertures. The model relies on the fact that subwavelength apertures perforated in metallic films behave like monomode waveg…
Drawing on the theory of quantum mechanical stress, we introduce the stress density in density functional theory. In analogy with the Chetty-Martin energy density, the stress density provides a spatial resolution of the contributions to the integrated macroscopic stress tensor. We give specific prescriptions for a pra…
Neutron powder diffraction has been used to examine the structural changes of the rare-earth aluminates LaAlO 3 , PrAlO 3 and NdAlO 3 over a wide range of temperatures. At room temperature, all three aluminates adopt the rhombohedral perovskite structure in space group R c ( a = 5.3647(1) Å, c = 13.1114(3) Å for LaAlO…
The earlier tremendous interest in molybdenum blue solutions-an enigma for generations of chemists-became even more pronounced when it turned out that the basic building units correspond to giant wheel-shaped clusters with nanostructured cavities, displaying exceptional aesthetic beauty. This discovery will stimulate…