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Yu. G. Denisenko,A. S. Aleksandrovsky,V.V.Atuchin,A. S. Krylovg,M. S. Molokeev,A. S. Oreshonkov,N. P. Shestakov,O. V. Andreev 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Eu2(SO4)3 was synthesized by chemical precipitation method and the crystal structure was determined by Rietveld analysis. The compound crystallizes in monoclinic space group С2/с. In the air environment, Eu2(SO4)3 is stable up to 670 °C. The sample of Eu2(SO4)3 was examined by Raman, Fourier-transform infrared absorption and luminescence spectroscopy methods. The low site symmetry of SO4 tetrahedra results in the appearance of the IR inactive ν1 mode around 1000 cm−1 and ν2 modes below 500 cm−1. The band intensities redistribution in the luminescent spectra of Eu3+ ions is analyzed in terms of the peculiarities of its local environment.
Pressure change dynamics of plasma focus chambers as a part of the pulse neutron generators
Mikhailov Yu.V.,Prokuratov I.A.,Lemeshko B.D.,Morozov V.M.,Dulatov A.K.,Charaev O.A.,Rukoliansky A.O.,Andreev V.G.,Litvinov I.N. 한국물리학회 2022 Current Applied Physics Vol.39 No.-
The dynamics of working gas pressure changes in the plasma focus (PF) chambers were studied by using the chamber with a built-in manometer as part of the ING-102 neutron generator (2.5 MeV neutron yield 106÷107 neutrons/pulse). Investigations were carried out during high-voltage training and neutron emission operation mode. The studies were executed while filling the chamber with various gas mixtures. For operation with a deuterium-tritium mixture, a sealed-off chamber with a built-in gas generator was used. After the primary filling of the PF chambers with a gas mixture, there is a systematic decrease in pressure by Δp = (5 ÷ 50)⋅10-3 Torr (~0,7 ÷ 7 Pa) after each shot of the chamber. The change in the shape of breakdown curves Ubr(p) in the interelectrode gap of the chamber after each series of shots was studied. That made it possible to assess the optimal number of shots during high-voltage training of the PF chamber.
Magnetism of ordered and disordered alloys of R<sub>2</sub>Fe<sub>14</sub>B (R=Nd, Er) type
Teplykh, A.E.,Chukalkin, Yu.G.,Lee, S.,Bogdanov, S.G.,Kudrevatykh, N.V.,Rosenfeld, E.V.,Skryabin, Yu.N.,Choi, Y.,Andreev, A.V.,Pirogov, A.N. Elsevier Sequoia 2013 Journal of alloys and compounds Vol.581 No.-
Magnetic susceptibility, magnetization and neutron diffraction measurements have been performed to study structure and magnetic states of crystalline and amorphous Nd<SUB>2</SUB>Fe<SUB>14</SUB>B and Er<SUB>2</SUB>Fe<SUB>14</SUB>B alloys. In the crystalline state there exists a large (about 20%) anisotropy of Er-sublattice magnetization. Values of the magnetic anisotropy constant of Er ions and the Er-Fe exchange-coupling parameter were estimated using temperature dependence of the Er- and Fe-sublattice magnetizations. Amorphous state of the samples was obtained by irradiation of fast (E<SUB>eff</SUB>≥1@?eV) neutrons with a fluence up to the 1.2x10<SUP>20</SUP>n/@?m<SUP>-2</SUP> at 340K. It is shown that antiferromagnetic coupling between the rare-earth and iron spins is kept in the amorphous state. Amorphization of the samples is found to result in reduction of the Curie temperature (T<SUB>C</SUB>) by about 200K and almost total absence of coercivity. We suggest that the strong decrease of T<SUB>C</SUB> is a consequence of enhancement of negative Fe-Fe interactions as a result of dispersion of interatomic distances, which is a characteristic feature of the amorphous state.
High-temperature oxidation of europium (II) sulfide
Yuriy G. Denisenko,Maxim S. Molokeev,Alexander S. Krylov,Aleksandr S. Aleksandrovsky,Aleksandr S. Oreshonkov,Victor V. Atuchin,Nikita O. Azarapin,Pavel E. Plyusnin,Elena I. Sal’nikova,Oleg V. Andreev 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
The process of high-temperature oxidation of EuS in the air was explored in the temperature range of500–1000 C. The oxidation reaction enthalpy was determined (DH0exp =1718.5 kJ/mol). The study ofoxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500–600 C, EuSis oxidized to a mixture of Eu3+-containing compounds (Eu3S4, Eu2O2S). In the range of 700–1000 C, onlyeuropium oxysulfate Eu2O2SO4 is formed. The structure refinement for Eu2O2SO4 was performed by theRietveld method. The luminescence intensity of europium oxysulfate Eu2O2SO4 with characteristic 4f-4ftransitions from the 5D0 state was investigated as a function of oxidation temperature.
Cosmic ray oriented performance studies for the JEM-EUSO first level trigger
Abdellaoui, G.,Abe, S.,Acheli, A.,Adams Jr., J.H.,Ahmad Jr., S.,Ahriche Jr., A.,Albert Jr., J.-N.,Allard Jr., D.,Alonso Jr., G.,Anchordoqui Jr., L.,Andreev Jr., V.,Anzalone Jr., A.,Aouimeur Jr., W.,Ar Elsevier BV * North-Holland 2017 Nuclear Instruments & Methods in Physics Research. Vol. No.
<P><B>Abstract</B></P> <P>JEM-EUSO is a space mission designed to investigate Ultra-High Energy Cosmic Rays and Neutrinos ( E > 5 ⋅ 1 <SUP> 0 19 </SUP> eV ) from the International Space Station (ISS). Looking down from above its wide angle telescope is able to observe their air showers and collect such data from a very wide area. Highly specific trigger algorithms are needed to drastically reduce the data load in the presence of both atmospheric and human activity related background light, yet retain the rare cosmic ray events recorded in the telescope. We report the performance in offline testing of the first level trigger algorithm on data from JEM-EUSO prototypes and laboratory measurements observing different light sources: data taken during a high altitude balloon flight over Canada, laser pulses observed from the ground traversing the real atmosphere, and model landscapes reproducing realistic aspect ratios and light conditions as would be seen from the ISS itself. The first level trigger logic successfully kept the trigger rate within the permissible bounds when challenged with artificially produced as well as naturally encountered night sky background fluctuations and while retaining events with general air-shower characteristics.</P>
Chukalkin, Yu.G.,Teplykh, A.E.,Kudrevatykh, N.V.,Choo, K.N.,Lee, S.,Andreev, A.V.,Pirogov, A.N. Elsevier 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.615 No.-
<P><B>Abstract</B></P> <P>Magnetization and neutron diffraction measurements have been carried out to study evolution of structure and magnetic states of amorphous Nd<SUB>2</SUB>Fe<SUB>14</SUB>B and Er<SUB>2</SUB>Fe<SUB>14</SUB>B alloys under isothermal annealing at 295–1025K. The amorphization have been performed by neutron irradiation which provides a homogeneous state in different with other methods of amorphization. The annealing induces a rise of α-Fe phase content in alloys and a recrystallization into Nd<SUB>2</SUB>Fe<SUB>14</SUB>B-type phase. Neutron diffraction data show that the recrystallization occurs over narrow temperature interval (590–638) K in Er<SUB>2</SUB>Fe<SUB>14</SUB>B and at around 800K in Nd<SUB>2</SUB>Fe<SUB>14</SUB>B. Magnetic measurements testify that in both samples the magnetization and coercive field increase with annealing temperature above 800K.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Annealing of R<SUB>2</SUB>Fe<SUB>14</SUB>B amorphized by fast neutrons. </LI> <LI> Annealing leads to crystallization above 600 K (R = Er) and 800 K (R = Nd). </LI> <LI> Crystallization is accompanied by increase of magnetization and coertivity. </LI> </UL> </P>
Infrared spectroscopy and nano-imaging of the insulator-to-metal transition in vanadium dioxide
Qazilbash, M. M.,Brehm, M.,Andreev, G. O.,Frenzel, A.,Ho, P.-C.,Chae, Byung-Gyu,Kim, Bong-Jun,Yun, Sun Jin,Kim, Hyun-Tak,Balatsky, A. V.,Shpyrko, O. G.,Maple, M. B.,Keilmann, F.,Basov, D. N. American Physical Society 2009 Physical review. B, Condensed matter and materials Vol.79 No.7