Quick ellipsometric technique for determining the thicknesses and optical constant profiles of Fe/SiO2/Si(100) nanostructures during growth

An algorithm is developed to perform rapid control of the thickness and optical constants of a film structure during growth. This algorithm is tested on Fe/SiO₂/Si(100) structures grown in an Angara molecular-beam epitaxy setup. The film thicknesses determined during their growth are compared with X-ray spectral fluorescence analysis and transmission electron microscopy data.     

Ellipsometric technique for determining in situ the absorption coefficient of semiconducting nanolayers

An algorithm that makes it possible to solve the inverse problem of ellipsometry aimed at determining the absorption coefficient on the basis of a single-zone ellipsometric experiment during the growth of thin semiconducting films is developed and implemented. The technique is based on analysis of the variation of ellipsometric parameters Ψ and Δ directly during the growth. The algorithm is tested in synthesis of Si/SiO₂/Si(100) and Hg_{1 ? x} Cd _x Te structures.     

Structural characterization of iron silicide nanoclusters in Si/FeSi heterosystems using magneto-optic ellipsometry

The initial stages of iron film growth on monocrystalline silicon were studied using a combined method of magneto-optic ellipsometry. The growth of iron silicide nanoclusters on the silicon surface was shown to occur at thickness d < 1.2 nm in non-magnetic phase.     

Synthesis of 5,5-bis(difluoroamino)-2-hexanone

Conclusions A method was developed for the preparation of 5,5-bis(difluoroamino)-2-hexanone by the acid hydrolysis of the sodium salt of 2-nitro-5,5-bis(difluoroamino)hexane.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2145–2146, September, 1973.     

Synthesis of boron nitride multi-walled nanotubes by laser ablation technique

Carbon nanotubes are known as prospective material for the optoelectronics, vacuum electronics, non-linear optics and for the composite material synthesis. Boron nitride nanotubes (BNNTs) were obtained only recently. It is expected that these nanotubes possess the unique properties. BN is much more chemically inert than carbon. Its oxidation temperature is above 1000°C as the graphite is totally oxidized already at 650°C. BNNTs are wide-gap semiconductors with the 6 eV gap. In case of the introducing of the carbon atoms into the BN nanotube wall its bandgap may be varied in wide range. This property is important for the UV optics.     

Synthesis ofα-difluoroaminoalkyl alkyl ethers

Conclusions The reaction of difluoroaminomethanol and-difluoroaminoethanol with aliphatic alcohols gives mixed-difluoroaminoalkyl alkyl ethers.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2394–2396, October, 1973.     

In situ investigation of ferromagnetism in magnetic nanolayers at room temperature

Ultrathin iron layers on different substrates and a Dy_{1 ? x} Ni _x /Nibilayer have been investigated in situ using the magneto-optical Kerr effect. Ferromagnetic ordering in the Dy_{1 ? x} Ni _x /Nistructure at room temperature has been established. A technique for estimating the thickness of the iron/silicon interface is proposed.     

Influence of low-intensive beta-irradiation on phase transformations in silicon at microindentation

Raman spectroscopy is used to investigate the morphology of silicon phase composition in the indenter imprint with spatial resolution of ~200 nm. Suppression of the efficiency of Si-XII, Si-III, and a-Si phase formation induced by beta-particle irradiation from a ⁹⁰Sr + ⁹⁰Y source (fluence F = 3.6⋅10¹⁰ cm^–2) is revealed.