期刊,Inorganic materials: applied research 2025年16卷2期_国家学术搜索

Fire Protection of Steel Structures

Yu. M. EvtushenkoS. H. ToirovN. N. Shevchenko

241-250页

查看更多>>摘要：The review provides data on the current state of fire protection of steel structures, including the development of fire-resistant coatings, their composition, mechanism of action, and test methods. The most important directions of further research have been identified: the search for the most effective components of fire protection with a symbiotic effect, increasing resistance to atmospheric influences, and development and improvement of existing methods of testing fire-resistant coatings.

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Springer Nature

Fire Protection of Steel Structures

Yu. M. EvtushenkoS. H. ToirovN. N. Shevchenko

241-250页

查看更多>>摘要：The review provides data on the current state of fire protection of steel structures, including the development of fire-resistant coatings, their composition, mechanism of action, and test methods. The most important directions of further research have been identified: the search for the most effective components of fire protection with a symbiotic effect, increasing resistance to atmospheric influences, and development and improvement of existing methods of testing fire-resistant coatings.

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NETL
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Springer Nature

Surface-Enhanced Raman Scattering of the Double Transition Metal Mo_2TiC_2-O_x MXene-Based Structures

I. A. ZavidovskiyN. M. BelozerovaA. V. SyuyD. I. Yakubovsky...

251-259页

查看更多>>摘要：Surface-enhanced Raman scattering (SERS) sensors based on a commercial three-component double transition metal Mo_2TiC_2-O_x MXene are presented. It is shown that the threshold of detection of rhodamine 6G with the SERS sensors is 10~(-8) M, which by an order of magnitude exceeds the results obtained previously on the Mo_2TiC_2-O_x-based SERS sensors. The Mo_2TiC_2-O_x structure has been analyzed by scanning and transmission electron microscopy, energy-dispersive spectroscopy, and Raman spectroscopy. The dynamics of the rhodamine 6G detection threshold change has been studied using the Mo_2TiC_2-O_x-based SERS sensors. The data obtained have allowed the estimation of the contribution of metal components of the residual precursor to the Mo_2TiC_2-O_x SERS activity and the identification of mechanisms of degradation of the SERS properties of the investigated compound. The reported results are of great importance for understanding the relationship between the SERS activity and structural properties of MXenes and for evaluating their application potential in the field of SERS sensing.

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Springer Nature

Surface-Enhanced Raman Scattering of the Double Transition Metal Mo_2TiC_2-O_x MXene-Based Structures

I. A. ZavidovskiyN. M. BelozerovaA. V. SyuyD. I. Yakubovsky...

251-259页

查看更多>>摘要：Surface-enhanced Raman scattering (SERS) sensors based on a commercial three-component double transition metal Mo_2TiC_2-O_x MXene are presented. It is shown that the threshold of detection of rhodamine 6G with the SERS sensors is 10~(-8) M, which by an order of magnitude exceeds the results obtained previously on the Mo_2TiC_2-O_x-based SERS sensors. The Mo_2TiC_2-O_x structure has been analyzed by scanning and transmission electron microscopy, energy-dispersive spectroscopy, and Raman spectroscopy. The dynamics of the rhodamine 6G detection threshold change has been studied using the Mo_2TiC_2-O_x-based SERS sensors. The data obtained have allowed the estimation of the contribution of metal components of the residual precursor to the Mo_2TiC_2-O_x SERS activity and the identification of mechanisms of degradation of the SERS properties of the investigated compound. The reported results are of great importance for understanding the relationship between the SERS activity and structural properties of MXenes and for evaluating their application potential in the field of SERS sensing.

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Springer Nature

Doping of Thermoelectric Nanostructured Solid Solution Si_(1-x)Ge_x (x ～ 0.3) with Donor and Acceptor Impurities during the Synthesis Process by Spark Plasma Sintering

Yu. M. KuznetsovI. V. ErofeevaM. V. DorokhinM. S. Boldin...

260-271页

查看更多>>摘要：The work examines the doping of a Si_(1-x)Ge_x solid solution with donor (Sb, P) and acceptor (B) impurities during the synthesis process using electric pulse plasma sintering from powders with submicron particle sizes. The impurity content varied from 0.5 to 2.0 at %. Using the methods of X-ray diffraction, scanning electron microscopy, and X-ray microanalysis, it has been shown that the introduction of an impurity into a solid solution obeys the laws of equilibrium solubility; in particular, when the solubility limit is exceeded, precipitates of the impurity material are formed in the matrix of the material. This fact seems interesting, since electric pulse plasma sintering as a synthesis method is considered nonequilibrium. Studies of thermoelectric properties show that the selection of doping conditions makes it possible to form materials for which, despite the presence of impurity phase inclusions, high values of the thermoelectric figure of merit comparable to the world level of results can be obtained.

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Springer Nature

Doping of Thermoelectric Nanostructured Solid Solution Si_(1-x)Ge_x (x ～ 0.3) with Donor and Acceptor Impurities during the Synthesis Process by Spark Plasma Sintering

Yu. M. KuznetsovI. V. ErofeevaM. V. DorokhinM. S. Boldin...

260-271页

查看更多>>摘要：The work examines the doping of a Si_(1-x)Ge_x solid solution with donor (Sb, P) and acceptor (B) impurities during the synthesis process using electric pulse plasma sintering from powders with submicron particle sizes. The impurity content varied from 0.5 to 2.0 at %. Using the methods of X-ray diffraction, scanning electron microscopy, and X-ray microanalysis, it has been shown that the introduction of an impurity into a solid solution obeys the laws of equilibrium solubility; in particular, when the solubility limit is exceeded, precipitates of the impurity material are formed in the matrix of the material. This fact seems interesting, since electric pulse plasma sintering as a synthesis method is considered nonequilibrium. Studies of thermoelectric properties show that the selection of doping conditions makes it possible to form materials for which, despite the presence of impurity phase inclusions, high values of the thermoelectric figure of merit comparable to the world level of results can be obtained.

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Springer Nature

Microwave Absorbers Based on Nickel-Containing Powdered Activated Charcoal

O. V. BoipravV. A. BogushV. S. MokerovE. S. Belousova...

272-277页

查看更多>>摘要：The patterns of changes in the electromagnetic radiation absorption characteristics in the frequency range of 2.0-17.0 GHz of materials based on nickel-containing powdered activated charcoal are presented and substantiated depending on the duration of the process of deposition of nickel nanoparticles from aqueous solutions implemented during its production. These materials are made by filling containers formed from a self-adhesive polymer film with particles of such charcoal. A foil-coated polymer film is attached to one of the outer surfaces of the walls of these containers. The thickness of these materials was 0.3 cm. It was established that their values of the electromagnetic radiation absorption coefficient in the frequency range 2.0-17.0 GHz reach of 0.9. The width of the electromagnetic radiation effective absorption band of materials based on nickel-containing powdered activated charcoal during the production of which the duration of the process of nickel nanoparticles deposition was 5.0 min is equal to 10.0 GHz, and for materials based on nickel-containing powdered activated charcoal during the production in which the duration of the process of nickel nanoparticles deposition was 10.0 and 15.0 min, it is 10.6 and 10.8 GHz, respectively. The average value of electromagnetic radiation absorption coefficient in the effective absorption band of the listed materials is 0.75, 0.77, and 0.82 rel. units respectively. It should be noted that the width of the electromagnetic radiation effective absorption band of materials manufactured in the above manner based on powdered activated charcoal is 6.7 GHz, and their average value of the electromagnetic radiation absorption coefficient in the specified band is 0.74 rel. units. The studied materials are among the basic materials of electronic technology and can be used to ensure electromagnetic compatibility of electronic devices, as well as microwave devices.

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Springer Nature

Microwave Absorbers Based on Nickel-Containing Powdered Activated Charcoal

O. V. BoipravV. A. BogushV. S. MokerovE. S. Belousova...

272-277页

查看更多>>摘要：The patterns of changes in the electromagnetic radiation absorption characteristics in the frequency range of 2.0-17.0 GHz of materials based on nickel-containing powdered activated charcoal are presented and substantiated depending on the duration of the process of deposition of nickel nanoparticles from aqueous solutions implemented during its production. These materials are made by filling containers formed from a self-adhesive polymer film with particles of such charcoal. A foil-coated polymer film is attached to one of the outer surfaces of the walls of these containers. The thickness of these materials was 0.3 cm. It was established that their values of the electromagnetic radiation absorption coefficient in the frequency range 2.0-17.0 GHz reach of 0.9. The width of the electromagnetic radiation effective absorption band of materials based on nickel-containing powdered activated charcoal during the production of which the duration of the process of nickel nanoparticles deposition was 5.0 min is equal to 10.0 GHz, and for materials based on nickel-containing powdered activated charcoal during the production in which the duration of the process of nickel nanoparticles deposition was 10.0 and 15.0 min, it is 10.6 and 10.8 GHz, respectively. The average value of electromagnetic radiation absorption coefficient in the effective absorption band of the listed materials is 0.75, 0.77, and 0.82 rel. units respectively. It should be noted that the width of the electromagnetic radiation effective absorption band of materials manufactured in the above manner based on powdered activated charcoal is 6.7 GHz, and their average value of the electromagnetic radiation absorption coefficient in the specified band is 0.74 rel. units. The studied materials are among the basic materials of electronic technology and can be used to ensure electromagnetic compatibility of electronic devices, as well as microwave devices.

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NETL
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Springer Nature

Optical Properties, Structural Homogeneity, and Defect Centers of Double-Doped LiNbO_3:Zn:Mg Single Crystals Obtained Using Different Technologies

R. A. TitovM. V. SmirnovL. A. BobrevaN. A. Teplyakova...

278-290页

查看更多>>摘要：Features of the defect structure of a nominally pure LiNbO_(3stoich) crystal and double-doped LiNbO_3:Zn:Mg (3.45:1.41 mol %) and LiNbO_3:Zn:Mg (3.45:1.22 mol %) single crystals have been studied using Raman spectroscopy, infrared absorption spectroscopy, photoluminescence, laser conoscopy, and photoinduced light scattering. The material for the study has been obtained using homogeneous and direct doping technology. It has been shown that double-doped LiNbO_3:Zn:Mg crystals obtained using different technologies have high resistance to damage by laser radiation. However, the LiNbO_3:Zn:Mg (3.45:1.22 mol %) crystal obtained by direct doping technology is characterized by lower compositional uniformity compared to the LiNbO_3:Zn:Mg (3.45:1.41 mol %) crystal obtained by homogeneous doping technology. Raman spectra have showed that the features of the defect structure of double-doped LiNbO_3:Zn:Mg crystals are largely determined by the magnesium impurity. This may be the reason that the influence of the ordering mechanism of magnesium cations (～1.22-1.44 mol %) prevails over the influence of the disordering mechanism of zinc cations (～3.45 mol %) on the features of the structural units of the cation sublattice. It has been found that the lowest concentration of OH groups and photoluminescence intensity in the near-IR region is characteristic of the LiNbO_3:Zn:Mg (3.45:1.41 mol %) crystal obtained by homogeneous doping technology.

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Springer Nature

Optical Properties, Structural Homogeneity, and Defect Centers of Double-Doped LiNbO_3:Zn:Mg Single Crystals Obtained Using Different Technologies

R. A. TitovM. V. SmirnovL. A. BobrevaN. A. Teplyakova...

278-290页

查看更多>>摘要：Features of the defect structure of a nominally pure LiNbO_(3stoich) crystal and double-doped LiNbO_3:Zn:Mg (3.45:1.41 mol %) and LiNbO_3:Zn:Mg (3.45:1.22 mol %) single crystals have been studied using Raman spectroscopy, infrared absorption spectroscopy, photoluminescence, laser conoscopy, and photoinduced light scattering. The material for the study has been obtained using homogeneous and direct doping technology. It has been shown that double-doped LiNbO_3:Zn:Mg crystals obtained using different technologies have high resistance to damage by laser radiation. However, the LiNbO_3:Zn:Mg (3.45:1.22 mol %) crystal obtained by direct doping technology is characterized by lower compositional uniformity compared to the LiNbO_3:Zn:Mg (3.45:1.41 mol %) crystal obtained by homogeneous doping technology. Raman spectra have showed that the features of the defect structure of double-doped LiNbO_3:Zn:Mg crystals are largely determined by the magnesium impurity. This may be the reason that the influence of the ordering mechanism of magnesium cations (～1.22-1.44 mol %) prevails over the influence of the disordering mechanism of zinc cations (～3.45 mol %) on the features of the structural units of the cation sublattice. It has been found that the lowest concentration of OH groups and photoluminescence intensity in the near-IR region is characteristic of the LiNbO_3:Zn:Mg (3.45:1.41 mol %) crystal obtained by homogeneous doping technology.

原文链接:

NETL
NSTL
Springer Nature