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Efimov, Alexey,Lizunova, Anna,Sukharev, Valentin,Ivanov, Victor Materials Research Society of Korea 2016 한국재료학회지 Vol.26 No.3
The morphology, crystal structure and size of aerosol nanoparticles generated by erosion of electrodes made of different materials (titanium, copper and aluminum) in a multi-spark discharge generator were investigated. The aerosol nanoparticle synthesis was carried out in air atmosphere at a capacitor stored energy of 6 J, a repetition rate of discharge of 0.5 Hz and a gas flow velocity of 5.4 m/s. The aerosol nanoparticles were generated in the form of oxides and had various morphologies: agglomerates of primary particles of $TiO_2$ and $Al_2O_3$ or aggregates of primary particles of $Cu_2O$. The average size of the primary nanoparticles ranged between 6.3 and 7.4 nm for the three substances studied. The average size of the agglomerates and aggregates varied in a wide interval from 24.6 nm for $Cu_2O$ to 46.1 nm for $Al_2O_3$.
First-principles Studies of AlSb, GaSb, and InSb on Si(111) and Si(100)
Oleg Efimov,이근정,윤영귀 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.1
We study the energetics and the atomic structures of MSb, where M is Al, Ga, or In, monolayers or thicker layers on Si(111)1×1 substrates and Si(100)2×1 substrates from first-principles. The calculated surface energies of MSb on Si(111) differ less than those of MAs on Si(111), for each M. Si(100)2×1:Sb is the most stable for each M among Si(100)2×1, Si(100)2×1:Sb, Si(100)2×1:(MSb), and Si(100)2×1:M. The relative surface energies of thicker epitaxial overlayer films on Si(100) are larger.
윤영귀,Oleg Efimov 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.1
Tight-binding electronic band structure calculations on perturbed (n,n) carbon nanotubes have been performed. Our study shows that periodic local perturbations influence the electronic band structures of (n,n) carbon nanotubes in different ways depending on the symmetry of the perturbation. We focus on reflection-symmetry-breaking local perturbations and analyze possible band crossings at the Fermi level at the Γ point in small-radius (n,n) carbon nanotubes with selected spatial periods. We find perturbations on the order of 1 eV are required to cause the nanotube to be metallic in the presence of the perturbations. This finding provides valuable information regarding sensor and electronic-device applications of perturbed (n,n) carbon nanotubes.
Enhancement of pinning and the peak effect in Y1–Fe Ba2Cu3O high-temperature superconductors
Pigalskiy K.S.,Vishnev A.A.,Efimov N.N.,Shabatin A.V.,Trakhtenberg L.I. 한국물리학회 2022 Current Applied Physics Vol.41 No.-
Complex structural and magnetic studies of polycrystalline samples of the Y1-xFexBa2Cu3Oy high-Tc superconductor (x = 0, 0.02, 0.05) have been carried out in order to determine the effect of weak doping with a magnetic 3d ion on structural changes and the critical current density Jc. An increase in the Fe content results in a significant change in Jc and its field dependence. The dependences Jc(H) become nonmonotonic and demonstrate a pronounced peak (peak effect); as a result, the Jc increases strongly in wide temperature and magnetic field regions. The analysis of the field dependences of the pinning force reveals a scaling behavior. The parameters of the scaling function correspond to the point magnetic defects under strong effects of a thermally activated flux flow. Thus, the weak Fe doping (several molar percent) is a promising way to significant improvement of transport properties of high-Tc superconducting materials based on 123-type compounds.