Materials Literature
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The effects of adding 1 wt.% Al element on the oxidation behavior of CM-247LC Ni-based superalloy are studied under high temperature conditions, namely, 1000°C and 1150°C dry air isothermal oxidation test. The microstructure of oxides, γ matrix and γ′ precipitate are observed and analyzed by using X-ray diffraction (X…
Hypotheses on how first-order phase transitions develop which deny a fundamental element of the classical thermal fluctuation theory, namely, that the nucleation of a new phase must take place when the crystal lattice changes, are considered. It is shown that the thermal fluctuation theory does not work for polymorphi…
In the present research, zinc oxide (ZnO) films have been prepared by simple solution method and spray pyrolysis on different substrates (glass and sapphire) for different molar concentrations (0.2M & 0.25M). The films were subjected to different substrate temperatures (400 °C and 450 °C respectively. These were chara…
Limestone soil in karst areas is the product of weathering and carbonate rock dissolution in tropical and subtropical regions. Limestone soil in karst regions has a Ca-rich alkaline geochemical environment, but the characteristics of calcium speciation in limestone soil remain unclear. Here, to study changes in calciu…
In this study we used simultaneous grazing-incidence small- and wide-angle X-ray scattering (GISAXS and GIWAXS, respectively) to probe the multilength-scale structures of thin active layers comprising the linear A–D–A-type π-conjugated donor molecule TBDTCNR and the fullerene acceptor molecule PC 61 BM for use in solu…
The target model of the NRNU MEPhI provides, in particular, the transition to the use of distance learning platforms, integrated with the international educational environment and social learning networking. A special place in education network is allocated to computer tools to support the learning process. These tool…
Semiconductor field emitters are suitable candidates for applications, which require a very stable field emission (FE) current and a high emission uniformity over the entire emission area. By using different materials and geometries, we are able to vary the FE characteristics within a wide range. Each specific applica…
The frequency (ν = 10−1–107 Hz) dependences σ(ν) of the conductivity of single crystals of the Pb0.67Cd0.33F2 superionic conductor with the fluorite-type structure (CaF2) in the temperature range of 132–395 K have been studied. The dependences σ(ν) have been discussed in the framework of the hopping relaxation of ioni…
A sulfate bath was used to investigate the influence of current density on the electrodeposition behavior of Zn-Ni-Mn on steel. The presence of Zn2+ in the plating bath during Zn–Ni–Mn alloys codeposition is the cause of significant inhibition of Ni and Mn deposition. A transition current density was noticed above whe…
Abstract In calcite and aragonite, γ-irradiated at 77 K, several paramagnetic centers were generated and detected by EPR spectroscopy; in calcite, CO3 − (orthorhombic symmetry, bulk and bonded to surface), CO3 3−, NO3 2−, O3 −, and in aragonite CO2 − (isotropic and orthorhombic symmetry) depending on the type of calci…
This article focuses on the development of phenolic resin moulding materials for the production of new carbon fibre-reinforced ceramic composite materials based on C/C-SiC by utilising the LSI (liquid silicon infiltration) production method. The production of these moulding materials is being accomplished by combining…
In order to improve the cost efficiency of deficit expensive metals, as well as for the import substitution of items, various methods of improving the physicomechanical properties of materials are applied. The subject matter of the article is improvement of wear resistance of hard alloys by impact of high-energy singl…
Abstract A reliable simple approach is introduced to predict the heats of decomposition of nitroaromatics through their molecular structures. It is based on the number on nitro groups attached to aromatic ring and some structural moieties that depend on intra‐ and intermolecular interactions. In contrast to other avai…
We have studied exchange processes in contact complexes of triplet eosin molecules with oxygen molecules in the triplet (3Σ − ) and singlet (1Δ g ) states in thin polyvinylbutyral films in the presence of gold nanoparticles. Upon resonant excitation of surface plasmons in gold nanoparticles into the absorption band of…
The energy diagram of RuO2/Al‐doped TiO2/RuO2 structures was estimated from the capacitance–voltage and leakage current density–voltage curves. The Al‐doping profile in TiO2 film was varied by changing position of the atomic layer deposition cycle of Al2O3 during the atomic layer deposition of 9 nm‐thick TiO2 film. Th…
We have studied the fluorescent properties of vinylogous series of merocyanine dyes based on 1,3-indandione and heterocycles of different electron-donating powers. Using a set of solvents with polarities lying in a wide range, we have analyzed the dependence of their solvatofluorochromism on the key structural paramet…
Aluminum alloys are used in automobile and aerospace industries because of their low density and good mechanical properties, better wear resistance as compared to conventional metals and their alloys. In these industries there is continues demand to develop light weight, inexpensive and strong material which has led t…
A new technique to determine the true projected contact area by nanoindentation is presented. It requires combining two models used normally to determine the representative stress and strain from nanoindentation parameters. Consequently, it does not require any model classically used to calculate the projected contact…
Abstract The difficulty in determining the electron paramagnetic resonance (EPR) line parameters of ferromagnetic semiconductors has been addressed. For these materials, the resonance line is very broad and lies at low resonance field, so that only a part of the line can be detected experimentally. Moreover, the line…
A hydrolysis process was applied to prepare the compact TiO 2 layer using the fresh metastable TiCl 4 isopropanol/water solution as the precursor solution for the preparation of the inorganic–organic hybrid heterojunction perovskite solar cells. The optimal compact TiO 2 layer prepared from the aqueous solution of 2 m…