ACM SIGDOC Asterisk Journal of Computer Documentation

Association for Computing Machinery (ACM)

Association for Computing Machinery (ACM)

ISSN: 07311001

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ACM SIGDOC Asterisk Journal of Computer Documentation

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Publications found: 3884

The Russian Academy of Sciences

Surface segregation in binary metallic nanoparticles: atomistic and thermodynamic simulations

Samsonov V.M., Romanov A.A., Talyzin I.V., Zhigunov D.V., Puitov V.V.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

The results of molecular dynamics and atomistic simulations demonstrate segregation of Pd atoms to the surface of binary Pt-Pd nanoparticles and the surface segregation of Cr in Ni-Cr nanoparticles. At the same time, molecular dynamics results predict a transition from the surface segregation of Cr to the surface segregation of Ni at low Cr contents in Ni-Cr nanoparticles.

The Russian Academy of Sciences

Influence of magnetic field on the surface structure and properties of germanium single crystals

Marinicheva K.A., Ivanova A.I., Kaplunov I.A., Egorova K.A., Tretiakov S.A., Barabanova E.V., Rakunov P.A.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

The results of experimental studies using optical profilometry and scanning probe microscopy of the structure and surface parameters of germanium single crystals exposed to an alternating magnetic field are presented. The change in parameters of surface roughness and relief of single crystals after treatment by magnetic field was found. Using optical spectroscopy, a decrease in transmittance in the range of 1.8—23 μm was established, due to the influence of an alternating magnetic field, leading to a change in the surface topography.

The Russian Academy of Sciences

Effect of deformation on magnetic properties of Heusler alloys

Ivanova A.I., Karpenkov A.Y., Semenova E.M., Musabirov I.I., Vasiliev A.D.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

Magnetic properties of Heusler alloys with the Ni54.4Mn17.6Ga26.2Si1.8 composition subjected to comprehensive isothermal forging have been investigated. It was found that comprehensive isothermal forging leads to a shift in the temperatures of structural and magnetic phase transitions toward low temperatures, a slight decrease in magnetization and magnetocaloric effect, as well as a qualitative change in the magnetic domain structure.

The Russian Academy of Sciences

On the features of the first order phase transition in nanosized ferroelectrics

Nechaev V.N., Shuba A.V.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

An estimate of the nucleus critical size and the phase transition temperature in nanosized ferroelectrics with a first order phase transition is given. The influence of the external electric field strength on the nucleus critical size and the phase transition temperature and the temperature

The Russian Academy of Sciences

Influence of the molar ratio Sr:Bi:Ta in bismuth-strontium tantalum films Sr_yBi_2+xTa₂O₉ on structure and electrophysical properties

Kiselev D.A., Kurteva E.A., Semchenko A.V., Boiko A.A., Sudnik L.V., Chucheva G.V.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

Polycrystalline thin films of bismuth-strontium tantalum SryBi2+xTa2O9 with different molar ratio Sr:Bi:Ta were obtained by sol-gel method. The formation of a phase with a perovskite structure has been established. Phase transitions have been confirmed by dielectric spectroscopy. In the mode of polarization switching spectroscopy, remnant piezoelectric hysteresis loops were obtained, which confirms the ferroelectric nature of the synthesized SryBi2+xTa2O9 films.

The Russian Academy of Sciences

Magnetic properties of the Y₂ (Fe_xCo_1-x)₁₇ compounds

Sinkevich A.I., Lyakhova M.B., Karpenkov A.Y., Semenova E.M., Karpenkov D.Y., Pastushenkov Y.G.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

The results of magnetization curves analysis of Y2(FexCo1−x)17 compounds, measured in 300—923 K temperature interval along easy and hard magnetization direction, were represented. Magnetocrystalline anisotropy constants K1,2 of the samples were calculated. Temperature and compositional dependence of anisotropy constants K1,2 and saturation magnetization Ms were discussed. There is an increase of first anisotropy constant K1 value with the increase of relative samples iron concentration with maximum value of 5.1∙105 J·m-3 in x = 0.29 point, correspond to the middle of the easy-axis interval.

The Russian Academy of Sciences

Symmetry analysis of Raman spectra of crystals based on angular dependencies

Golovkina E.V., Krylova S.N., Vtyurin A.N., Krylov A.S.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

Suggested a method to reconstruct the Raman scattering tensor by studying the angular dependences of Raman line intensities in tiny unoriented microcrystals. The method was verified on well-known calomel Hg2Cl2 model crystals. The spectral line phase-indicators in the Raman spectra reveal different symmetry types of DUT-8 (Ni) metal-organic framework crystals in the open pores and closed pores phases. A technique can be used to reconstruct the Raman scattering tensor of any unoriented crystalline samples.

The Russian Academy of Sciences

Influence of polarization of nanosized films of barium-strontium titanate on the characteristics of ferroelectric phase shifters of the microwave range

Mukhortov V.M., Biryukov S.V., Golovko Y.I., Masychev S.I.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

The features of the behavior of polarization and tunability of thin ferroelectric films of barium-strontium titanate in a wide temperature range for two groups differing in production conditions are considered. An indirect connection between the tunability coefficient of film capacitors and the polarization of films has been noted.

The Russian Academy of Sciences

Scanning processing of materials with high-frequency pulsed lasers using acousto-optic deflectors

Guk А.S., Rogalin V.Е., Filin S.А., Kaplunov I.А.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

A new scheme for controlling the position and intensity of unpolarized radiation, including at several wavelengths, has been developed. A feature of the optical scheme is the use of two–coordinate acousto-optic deflectors, each of which works with linearly polarized radiation — horizontal and vertical. A polarizing plate is used to separate the initial unpolarized laser radiation. Estimates of optical losses when using acousto-optic systems are given.

The Russian Academy of Sciences

Magnetic properties of multicomponent system alloys (Er_1-xY_x)_0.8Sm_0.2Fe₂

Umkhaeva Z.S., Karpenkov A.Y., Tereshina I.S., Pankratov N.Y., Aliev I.M.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

Synthesis and studies of atomic crystal structure and magnetic properties of a new multicomponent system alloys (Er1-xYx)0.8Sm0.2Fe2 in which the substitution parameter x = 0, 0.2, 0.4, 0.6, 0.8, 1.0 have been carried out. It is shown that in the region 0.2 xcomp 0.4 the phenomenon of full magnetic compensation can be expected. The Er0.8Sm0.2Fe2 alloy demonstrates the phenomenon of magnetization compensation as a function of temperature at Tcomp = 400 K.

The Russian Academy of Sciences

Complex electro-mechanical parameters and features of the microstructure of porous piezoceramics of the lead zirconate-titanate system

Shvetsova N.A., Shvetsov I.A., Petrova E.I., Makarev D.I., Marakhovsky M.A., Rybyanets A.N.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

The microstructure features and complex electromechanical parameters of porous piezoelectric ceramics based on the lead zirconate-titanate system with different relative porosities and pore sizes were studied. It was revealed that the microstructural features of porous piezoceramics define the character of the porosity dependences of electromechanical properties of porous piezoelectric ceramics.

The Russian Academy of Sciences

Abrupt processes of remagnetization reversal processes in single crystals of GdCo₄Cu alloy

Kuznetsova Y.V., Degteva O.B., Karpenkov A.Y., Semenova Е.М., Belyavsky M.A., Mitina E.B.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

The results of the study of the features of the magnetization and remagnetization processes in single-crystal samples of the GdCo4Cu alloy are presented. Depending on the magnetic background, the coexistence of two hysteresis mechanisms is observed. Along with a significant magnetic viscosity, abrupt remagnetization is observed. The relationship of hysteresis processes with the structural state of samples is discussed.

The Russian Academy of Sciences

Ferroelectric composites BaTiO₃ and SrTiO₃ with a fusible additive B₂O₃

Tumarkin A.V., Sinelshchikova O.Y., Zigankova D.I., Tyurnina N.G., Tyurnina Z.G., Gagarin A.G., Karamov A.R.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

We presented the results of a study of the structural and electrical properties of ferroelectric composites based on barium and strontium titanates with the addition of boric anhydride synthesized by low-temperature sintering. The obtained materials are promising as a basis for the implementation of electrically controlled metamaterials with volumetric ferroelectric inhomogeneities.

The Russian Academy of Sciences

Piezoelectric hysteresis and relaxation processes in ferroelectric ceramics in weak electric fields

Shvetsov I.A., Shvetsova N.A., Petrova E.I., Reznichenko A.N., Makarev D.I., Rybyanets A.N.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

The processes of piezoelectric relaxation and hysteresis in ferroelectric piezoelectric ceramics based on the lead zirconate-titanate system are studied in the region of weak electric fields. An analysis of the field and time dependences of the complex piezoelectric modulus |d31| obtained by processing sequentially measured piezoresonance spectra of the radial vibration mode of thin piezoceramic disks using the piezoresonance spectrum analysis method and program (PRAP) was carried out. A physical interpretation of the results obtained is proposed.

The Russian Academy of Sciences

Activation analysis of the temperature dependence of the dielectric constant of ferroelectrics

Kuzenko D.V.

The Russian Academy of Sciences

Известия Российской академии наук Серия физическая , 2024 , citations by CoLab: 0 | Abstract

For ferroelectrics lead zirconate titanate and barium titanate, an exponential dependence of the dielectric constant on temperature is shown, provided that the Curie–Weiss law is satisfied. The temperature of equality of ferroelectric dielectric constants for activation processes caused by the interaction of domain walls with point defects, as well as the corresponding activation energies, have been determined.

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