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Materials Physics and Mechanics
Institute of Problems of Mechanical Engineering RAS
Materials Physics and Mechanics

Institute of Problems of Mechanical Engineering RAS

1605-2730

Materials Physics and Mechanics/Journal Materials Physics and MechanicsEIESCI
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    Field dependences of the magnetization of the hybrid SiC/Si structure grown by the vacancy method of coordinated substitution of atoms

    N.I. RulV.V. RomanovA.V. KorolevS.A. Kukushkin...
    1-7页
    查看更多>>摘要：The measurement data and a general approach to the analysis of the field dependencies of magnetization of the hybrid SiC/Si structure grown by the vacancy method of coordinated substitution of atoms (VMCSA) are presented. The experimental results can be interpreted as a set of additive contributions to the magnetization of the sample. The analysis of the field dependences of magnetization allowed us to identify a presence of paramagnetic impurities in the sample under study and an inclusion that demonstrates characteristic features of ferromagnetic ordering. It is shown than the value of the specific diamagnetic mass susceptibility of the main SiC/Si substance determined from experimental data cannot be described by the simple additive contribution of silicon and silicon carbide.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences

    Field dependences of the magnetization of the hybrid SiC/Si structure grown by the vacancy method of coordinated substitution of atoms

    N.I. RulV.V. RomanovA.V. KorolevS.A. Kukushkin...
    1-7页
    查看更多>>摘要：The measurement data and a general approach to the analysis of the field dependencies of magnetization of the hybrid SiC/Si structure grown by the vacancy method of coordinated substitution of atoms (VMCSA) are presented. The experimental results can be interpreted as a set of additive contributions to the magnetization of the sample. The analysis of the field dependences of magnetization allowed us to identify a presence of paramagnetic impurities in the sample under study and an inclusion that demonstrates characteristic features of ferromagnetic ordering. It is shown than the value of the specific diamagnetic mass susceptibility of the main SiC/Si substance determined from experimental data cannot be described by the simple additive contribution of silicon and silicon carbide.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences

    Formation of liquid-like inclusions near pores in amorphous intercrystalline layers in high-temperature ceramics

    M.Yu. GutkinS.A. KrasnitckiiN.V. Skiba
    8-16页
    查看更多>>摘要：A theoretical model is suggested that describes a mechanism of plastic deformation in high-temperature ceramic materials containing amorphous intercrystalline layers (AlLs) and pores in triple junctions of AlLs. Within the model, the plastic deformation is realized through the generation of liquid-like inclusions on pore surfaces and their subsequent propagation along the AILs. In the exemplary case of high-temperature CX-Al_2O_3 ceramics with AlLs, the dependences of the critical values of the external shear stress for the formation of a liquid-like inclusion on deformation temperature in a wide range of the deformation temperatures from 300 to 1500 K are calculated. It is shown that the critical stress for the nucleation of a liquid-like inclusion strongly depends on the deformation temperature and weakly depends on the pore size.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences

    Formation of liquid-like inclusions near pores in amorphous intercrystalline layers in high-temperature ceramics

    M.Yu. GutkinS.A. KrasnitckiiN.V. Skiba
    8-16页
    查看更多>>摘要：A theoretical model is suggested that describes a mechanism of plastic deformation in high-temperature ceramic materials containing amorphous intercrystalline layers (AlLs) and pores in triple junctions of AlLs. Within the model, the plastic deformation is realized through the generation of liquid-like inclusions on pore surfaces and their subsequent propagation along the AILs. In the exemplary case of high-temperature CX-Al_2O_3 ceramics with AlLs, the dependences of the critical values of the external shear stress for the formation of a liquid-like inclusion on deformation temperature in a wide range of the deformation temperatures from 300 to 1500 K are calculated. It is shown that the critical stress for the nucleation of a liquid-like inclusion strongly depends on the deformation temperature and weakly depends on the pore size.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences

    An influence of mechanical stresses on the phase state of spherulitic thin films of Lead zirconate titanate

    V.P. ProninI.V. RyzhovM.V. StaritsynS.V. Senkevich...
    17-26页
    查看更多>>摘要：The influence of lateral mechanical stresses on the crystal structure, microstructure and dielectric properties of spherulitic thin films of lead zirconate titanate is studied. The composition of lead zirconate titanate corresponded to the region of the morphotropic phase boundary. In thin films, the perovskite phase was formed during high-temperature annealing of amorphous films deposited by RF magnetron sputtering of a ceramic target on a cold silicon substrate. The deformation of the crystal lattice caused by the change in density during crystallization of the perovskite phase in the films changed with an increase in the area of spherulitic blocks with a variation in the target-substrate distance during their deposition. An increase in mechanical stress led to a linear rotation of the crystal lattice and a change in its parameters, as well as to a change in the microstructure of thin films. Based on the temperature dependences of the reverse dielectric permittivity, changes in the temperature of structural phase transitions in the films were revealed.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences

    An influence of mechanical stresses on the phase state of spherulitic thin films of Lead zirconate titanate

    V.P. ProninI.V. RyzhovM.V. StaritsynS.V. Senkevich...
    17-26页
    查看更多>>摘要：The influence of lateral mechanical stresses on the crystal structure, microstructure and dielectric properties of spherulitic thin films of lead zirconate titanate is studied. The composition of lead zirconate titanate corresponded to the region of the morphotropic phase boundary. In thin films, the perovskite phase was formed during high-temperature annealing of amorphous films deposited by RF magnetron sputtering of a ceramic target on a cold silicon substrate. The deformation of the crystal lattice caused by the change in density during crystallization of the perovskite phase in the films changed with an increase in the area of spherulitic blocks with a variation in the target-substrate distance during their deposition. An increase in mechanical stress led to a linear rotation of the crystal lattice and a change in its parameters, as well as to a change in the microstructure of thin films. Based on the temperature dependences of the reverse dielectric permittivity, changes in the temperature of structural phase transitions in the films were revealed.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences

    Photoluminescent characteristics of solution-processed nanoscale copper oxide

    S. SachdevaI. Choudhary
    27-37页
    查看更多>>摘要：In the present work, pure CuO nanoparticles were synthesized using the co-precipitation method, and their properties such as structural, morphological, and optical were elucidated. The obtained X-ray diffraction (XRD) patterns confirm that the synthesized CuO powders crystalize to a monoclinic phase. In addition to that, the appearance of the broad XRD peaks reflects the confinement of the particle size to nonorange. The average particle size of the synthesized CuO nanoparticles measured using field emission scanning electron microscopy (FESEM) image is 36.8 nm. Due to the size confinement to the nanoscale, the synthesized CuO nanoparticles showed a high optical band gap of 2.84 eV. Further, the emission properties of CuO measured using photoluminescence (PL) spectroscopy at an excitation wavelength of 300 nm reflects that most of the emission lies in the ultraviolet (UV) range. However, upon close investigation of the emission spectra, the peak corresponding to the blue emission was also observed. The appearance of this blue emission was the consequence of the various defects present in CuO such as oxygen vacancies and copper interstitials. The Commission Internationale de I'Eclairage (CIE) color coordinates for the blue color emitted by CuO nanoparticles is (0.15, 0.13), which lies close to the ideal blue color. Further, the synthesized CuO nanoparticles showed a high color purity of 84.71 % for blue color.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences

    Photoluminescent characteristics of solution-processed nanoscale copper oxide

    S. SachdevaI. Choudhary
    27-37页
    查看更多>>摘要：In the present work, pure CuO nanoparticles were synthesized using the co-precipitation method, and their properties such as structural, morphological, and optical were elucidated. The obtained X-ray diffraction (XRD) patterns confirm that the synthesized CuO powders crystalize to a monoclinic phase. In addition to that, the appearance of the broad XRD peaks reflects the confinement of the particle size to nonorange. The average particle size of the synthesized CuO nanoparticles measured using field emission scanning electron microscopy (FESEM) image is 36.8 nm. Due to the size confinement to the nanoscale, the synthesized CuO nanoparticles showed a high optical band gap of 2.84 eV. Further, the emission properties of CuO measured using photoluminescence (PL) spectroscopy at an excitation wavelength of 300 nm reflects that most of the emission lies in the ultraviolet (UV) range. However, upon close investigation of the emission spectra, the peak corresponding to the blue emission was also observed. The appearance of this blue emission was the consequence of the various defects present in CuO such as oxygen vacancies and copper interstitials. The Commission Internationale de I'Eclairage (CIE) color coordinates for the blue color emitted by CuO nanoparticles is (0.15, 0.13), which lies close to the ideal blue color. Further, the synthesized CuO nanoparticles showed a high color purity of 84.71 % for blue color.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences

    Finite element analysis for prediction of femoral component strength in hip joint endoprosthesis made from meta-biomaterial

    A.I. BorovkovL.B. MaslovM.A. ZhmayloF.D. Tarasenko...
    38-60页
    查看更多>>摘要：A theoretical study on the structural strength of an endoprosthesis stem made from meta-biomaterial is presented. We considered six types of metamaterials based on a biocompatible titanium alloy comprised by unit cells of lattice and surface structures. The standard for testing femoral components of endoprostheses was used to develop virtual test benches for simulation of the loading process, followed by stress-strain analysis of meta-biomaterial implants. Our general findings confirm the load-bearing capacity of the structures, additionally pointing to potential issues that may arise if the manufacturing technology of metamaterial endoprostheses is insufficiently rigorous.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences

    Finite element analysis for prediction of femoral component strength in hip joint endoprosthesis made from meta-biomaterial

    A.I. BorovkovL.B. MaslovM.A. ZhmayloF.D. Tarasenko...
    38-60页
    查看更多>>摘要：A theoretical study on the structural strength of an endoprosthesis stem made from meta-biomaterial is presented. We considered six types of metamaterials based on a biocompatible titanium alloy comprised by unit cells of lattice and surface structures. The standard for testing femoral components of endoprostheses was used to develop virtual test benches for simulation of the loading process, followed by stress-strain analysis of meta-biomaterial implants. Our general findings confirm the load-bearing capacity of the structures, additionally pointing to potential issues that may arise if the manufacturing technology of metamaterial endoprostheses is insufficiently rigorous.
      原文链接:
    • NETL
    • NSTL
    • Inst Problems Mechanical Engineering-Russian Acad Sciences