Materials Literature
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The lattice dynamics and spontaneous polarization in thin ferroelectric films of disordered solid solutions PbB′1/2 B″1/2 O3 (B′ = Sc, Ga, In, Lu; B″ = Nb, Ta) are calculated in terms of the generalized Gordon-Kim model. It is found that all the compounds under investigation contain an unstable polar mode, the frequen…
The catalytic properties of metal disilicides TiSi 2 , VSi 2 , MoSi 2 , HfSi 2 , TaSi 2 , and WSi 2 in the reaction of liquid-phase oxidation of octene-1 with molecular oxygen and the kinetic features of this process in the presence of the most active disilicide VSi 2 were studied. It was shown that the disilicides ha…
The ethylenediaminetetraacetate complex Li(H2O)3[Ga(Edta)] was synthesized and its crystal structure composed of octahedral (Ga(Edta)− anions connected to the Li(H2O) 3 + ion through the oxygen atom was studied. Five of the six hydrogen atoms of water molecules are involved in weak hydrogen bonds with the oxygen atoms…
The title complex [Ni(Im)6](DBSH)2 · 2DMF(H2DBSH = 3,5-dibromosalicylaldehyde, Im = imidazole, DMF = N,N-dimethylformamide) has been prepared and characterized by X-ray diffraction analysis. It crystallizes in the monoclinic system, space group P21/c with a = 14.7271(13), b = 9.0221(8), c = 18.1143(16) Å, β = 100.408(…
Abstract Applied surface and interface analysis methods such as Auger electron spectroscopy and X-ray photoelectron spectroscopy are particularly well suited to studying intergranular segregation. In the case of internal interfaces such as grain boundaries, they must be transformed into two open surfaces by intergranu…
The structural and photoluminescence properties of ytterbium-erbium silicate thin films have been investigated. The films were fabricated by RF-magnetron co-sputtering of Er2O3, Yb2O3and SiO2on c-Si and subsequent annealing in N2or O2atmosphere.
Methods of formation of thin film structures and sensor elements based on carbon nanotubes have been developed. Methods of integration using deposition from solutions, probe micromechanics and the electrokinetic positioning of nanotubes providing compatibility with traditional microelectronic technology, are suggested…
Poor mechanical properties of manufactured parts is one of the main problems in most of the RP and RM processes. This work deals with a study on formulation of new polymerization mixtures with the aim of being used in jetting process. Two different catalyst components were compared in order to shorten the solidificati…
Ti-Substituted MnZn ferrites were prepared by the conventional ceramic process. The effects of Ti-Substitution on temperature dependence and magnetic disaccommodation of MnZn ferrites were investigated. The experimental results show that the valley between peak I and Peak II of the mui-T curve initially becomes flatte…
ZnO nanorods were prepared by different methods of MOCVD, CVD and ZnO: Al nanomaterials were synthesized by the hydrothermal method. Their structure was investigated using X-ray diffraction XRD and field emission scanning electron microscopy FESEM. The diameter of the nanorods is from 40 to 90 nm and the length is fro…
Alumina was joining to the nickel alloy HAYNES ®214™ using a solid-state bonding technique with an intermediate nickel metallic foil. Experimentally, damages and cracks are often observed close to the metal/ceramics interface. Finite element analysis (FEA) using an elastic-plastic-creep model has been extensively deve…
The design of improved asphalt mix is achieved by the use of three majorvariables , weight of scrap tires replaced by coarse base aggregate , particles size of scrap tires finally the weight of binder used (bitumen). The improved asphalt mix (IAM) requires a balance between rutresistance and durability to resist crack…
Lead-based piezoelectric materials such as lead zirconate titanate (Pb(Zrx,Ti1-x)O3or PZT) and lead meta-niobate (PbNb2O6) are the most widely used materials nowadays in the market for piezoelectric application, including recently developed thick films based devices, because of their excellent piezoelectric properties…
Raman spectroscopy is shown to be a useful tool for the study of phase transitions, oxygen disorder and local vibrational modes in lanthanum manganese compounds of the perovskite type. In this work, we present results of the Raman scattering and x-ray diffraction studies of La0.7Sr0.3Mn1-xMxO3 manganites (M=Fe, Co, Ni…
The problem of diffraction of a cylindrical wave by a modified ideal Veselago lens is solved numerically. The effect of the dimensions and location of various insertions and the effect of the position of a cylindrical-wave source on the structure of the near field of the lens are investigated. It is shown that the fie…
The present paper is concerned with the oscillatory stability and selection condition of dendritic growth from a system of binary mixture with enforced flow. We consider the case of large Schmidt number (Sc⪢1) and obtain the uniformly valid asymptotic solution by following the approach of the interfacial wave (IFW) th…
Novel piezoelectric ceramic-polymer aligned (2-2) composites were prepared via the freeze casting method. The dielectric constant of the composites versus temperature was determined. The polarization versus field plots for the PZT-5A and the PMN-10PT aligned composite samples show an good ferroelectric behavior for bo…
We report on the synthesis of Ba1–x Sr x TiO3 (0≤x≤1) ceramics by solid state reaction using high energy ball milling from mixtures of carbonates of barium and strontium with titanium oxide in stoichiometric ratios and pressureless reactive sintering. Ba1–x Sr x TiO3 ceramics were obtained by milling at room temperatu…
The method of shear deformation of adhesive compounds based on high-molecular-mass glassy polymers is used for the pioneering analysis of changes in the elastic modulus as a function of contact time and temperature at the symmetric and asymmetric polymer-polymer interfaces. The kinetics of changes in the elastic modul…
Nickel oxide films were coated onto FTO substrate at optimum conditions. The coated NiO films exhibited nanopore structure. The cyclic stability of the NiO films was studied using cyclic voltammetry. An electrochromic device has been built with the structure G/FTO/NiO/PMMA–PC–H + /WO 3 /FTO/G . The device exhibits a c…