Hydrothermal microwave-assisted synthesis of LaFeO3 catalyst for N2O decomposition

Lanthanum orthoferrite powders were synthesized via one-step hydrothermal reactions under mild conditions using microwave and conventional heating. The use of microwave irradiation during the synthesis allows one to obtain nanocrystalline LaFeO₃ with a higher yield and reduced crystallite and particle size within a 16 times shorter duration (3 hours) at a lower temperature of 220°C as compared to the conventional heating. The catalytic decomposition of nitrous oxide was performed over both samples, it was shown that the sample obtained under microwave conditions demonstrates enhanced activity as a catalyst: N₂O decomposes completely at 700°C over the catalyst formed at microwave conditions, while the comparative catalyst prepared by conventional heating reaches a lower conversion of only 60% at the same temperature and catalytic reaction conditions.     

A Beta Spectrometer Based on Silicon Detectors

The characteristics of a beta spectrometer that consists of a total-absorption Si(Li) detector and a drift Si detector are presented. Using this spectrometer, it is possible to efficiently separate β radiation of nuclei from concomitant X and γ rays. The method is based on coincidences between signals from the thick and thin detectors. The spectrometer can be used to precisely measure the shape of the β spectra of various radioactive nuclei, in particular, of the ¹⁴⁴Pr nucleus, which is the most promising antineutrino source for searching for neutrino oscillations into a sterile state.     

Aluminum Alloy Matrix Composite Reinforced with Metallic Glasses Particles Using Hot-Roll Bonding

Russian Journal of Non-Ferrous Metals - Composite materials (CMs) exhibit high hardness, mechanical strength, and wear resistance, but their processing properties are limited. The most popular...     

Erratum to: Study of the Change in the Structure and Properties of High-Entropic Alloys during Thermal and Thermomechanical Processing

Russian Journal of Non-Ferrous Metals - An Erratum to this paper has been published: https://doi.org/10.3103/S1067821221040155     

Study of the Change in the Structure and Properties of High-Entropic Alloys during Thermal and Thermomechanical Processing

Russian Journal of Non-Ferrous Metals - Multicomponent alloys without a base element, also known as highly entropic alloys (HEAs), are of great interest for research. The microstructure of the...     

DNA immobilization on n-type silicon surface and electrophysical properties of Au-DNA-(n-Si) structures

DNA molecules immobilization on n-type single silicon was investigated. Electronic states were studied by measuring voltage-ampere characteristics (VAC) of Au-(n-Si) contacts with DNA molecules on the interface. It is showed that strong DNA fixation is observed in the presence of magnesium ions in solution. Molecules conformation on the surface is determined by the degree of the substrate hydrophobicity. Developed method of DNA immobilization allows to create model systems with the molecules in the form of molecular mesh or ropes depending on irradiation intensity. Formed on the silicon surface molecular structures have different effect on the electrical properties of Au-DNA-(n-Si) contacts. Presence of molecular mesh on the Schottky diode interface makes its VAC similar to ideal diode. The ropes lead to electronic state density increasing.