strict and expensive processes, which were commonly required for the removal of free CO2 present in the atmosphere. The prepared powders were found to be crystalline, pure, and contained no BaCO3 as an impurity phase. Pure and Dy-doped BaTiO3 powders synthesized at 90 8C had the pseudocubic (space group: Pm-3m) crystal structure. Grain growth characteristics of pure and Dy-doped BaTiO3 pellets ...

Influence of a dc electric field, microwave and terahertz (up to 1.63 THz) excitation on the carrier transport in moderately compensated n-InSb containing graded n/n+ junction is investigated. Hot electron thermo-electromotive force and field dependences of the dc-conductivity were measured within 10-110 K. Peculiarities of electron gas heating and lowtemperature electron transport can be a...

How impurity atoms move through a crystal is a fundamental and recurrent question in materials. The previous models of oxygen diffusion in titanium relied on interstitial lattice sites that were recently found to be unstable--leaving no consistent picture of the diffusion pathways. Using first-principles quantum-mechanical methods, we find three oxygen interstitial sites in titanium, and quanti...

We study 2D-polaritons in an atomically thin dipole-active layer (2D-crystal) placed inside a parallel-plate wavegude, and investigate the possibility to obtain the localized wavegude modes associated with atomic defects. Considering the wavegude width, l, as an adjustable parameter, we show that in the waveguide with l ∼ 10 a, where a is the lattice parameter, the localized mode can be provide...

The first-order phase transition of an MBBA nematic liquid crystal with benzene impurity has been studied by the critical opalescence method at a large cell thickness. Opalescence observed two points. spatial transverse parameters domains are determined from Fraunhofer diffraction. hypothesis about longitudinal correlation parameter is equal to length proposed.

We report photoluminescence (PL) studies of high-quality Zn 1~x Be x Se "lms grown by molecular beam epitaxy (MBE) on GaAs substrates by use of a novel growth method of Be}Zn co-irradiation before the growth of a thin ZnSe bu!er layer. Samples show double-crystal X-ray linewidth as narrow as 23 arcsec. Low-temperature (13K) PL of undoped samples showed free exciton emission, which de"ned the ba...

The local electronic structure due to the adsorption of Co on Cu111 is studied using an embedded cluster model, in which the crystal background is taken into account via an effective density functional theory (DFT)-based potential. This approach goes beyond the usual single-impurity Anderson model, where the ground state consists of a singly occupied impurity whose moment is compensated by the ...

Separation of glycols with close boiling points and relatively high viscosity at their melting point is a challenge in the production purity products downstream biorefinery processes. In this work, efficiency layer melt crystallization process acetone as assisting solvent was evaluated for mixture monoethylene glycol 1,2-pentanediol. Solid-liquid equilibrium measured modelled NRTL modified UNIF...

The influence of impurity element Sb on the oxidation resistance and creep strength single crystal superalloy TMS-238 was studied in this work. It found that 1.1 ppm clearly degrades resistance, but not for strength. As we increased amount up to 3.8 ppm, weight loss sample increased, as expected effect resistance. To understand mechanism, oxide structure characterized by scanning electron micro...

In this paper, the effect of pressure, temperature and impurity on the energylevels, binding energy, linear and nonlinear optical properties of a modified Gaussianquantum dot are studied. In this regard, the finite element method is employed to solvethe single electron Schrodinger equation in the effective mass approximation with andwithout impurity at the center of the dot. In addition, the en...