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ПЕРСПЕКТИВНЫЕ МАТЕРИАЛЫ

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Tilda Publishing

ПЕРСПЕКТИВНЫЕ МАТЕРИАЛЫ

ПЕРСПЕКТИВНЫЕ МАТЕРИАЛЫ

The influence of the gate material of MIS structures on the processes of high-field charge degradation
of the gate dielectric

D. V. Andreev, S. A. Kornev, G. G. Bondarenko, V.V. Andreev

A comparative study of high-field charge degradation effects in the gate dielectric of metal–insulator–semiconductor (MIS) structures with aluminum and polysilicon gates was carried out. Charging phenomena in MIS structures were investigated using high-field electron injection into the dielectric under conditions of gradually increasing stress current density, with periodic short-term switching to a measurement mode at a constant low injection current density. This experimental approach made it possible to obtain new insights into the charge degradation effects occurring in the gate dielectric of MIS structures with different gate materials under high-field injection conditions. The results demonstrate that, in MIS structures with a phosphorus-doped polysilicon gate, the formation of a thin phosphorus–silicate glass layer significantly suppresses the rate of charge degradation processes. As a consequence, the average charge injected into the gate dielectric prior to breakdown during high-field stress testing increases by more than an order of magnitude.

Keywords: MIS structure, gate dielectric, charge degradation, high-field electron injection, gate material, charge-to-breakdown.

DOI: 10.30791/1028-978X-2026-6-5-11

Reference citing:
Andreev D.V., Kornev S.A., Bondarenko G.G., Andreev V.V. Vliyanie materiala zatvora MDP-struktur na processy sil'nopolevoj zaryadovoj degradacii podzatvornogo dielektrika [The influence of the gate material of MIS structures on the processes of high-field charge degradation of the gate dielectric]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2026, no. 6, pp. 5 – 11. DOI: 10.30791/1028-978X-2026-6-5-11

ПЕРСПЕКТИВНЫЕ МАТЕРИАЛЫ

Investigation of the effect of calcium phosphates on the structure and properties of poly(-3-hydroxybutyrate-4-hydroxybutyrate)

A. Yu. Fedotov, P. M. Tyubaeva, O. V. Baranov, P. V. Lobzhanidze, I. A. Mihailov, I. A. Varyan, V. A. Merzlikin, R. R. Romanov, S. G. Karpova, A. A. Egorov, E. M. Generalov, V. S. Komlev

Samples based on poly(-3-hydroxybutyrate-4-hydroxybutyrate) polyester (P3GB4GB), filled with two types of calcium phosphates (CP): octacalcium phosphate (OCP) and tricalcium phosphate (TCP), were produced by irrigation. The influence of calcium phosphates on the microstructure, organization of the supramolecular structure of the polymer and the mechanical characteristics of film materials based on P3HB4HB was studied. It was established that the CP in the polymer matrix influence the crystalline/amorphous phase ratio of the polymer, presumably due to the interaction of the hydroxyl and phosphate groups of the CP with the carboxyl and hydroxyl groups of P3HB4HB. Composites with a content of 1% OCP and 5% TCP can demonstrate the formation of more advanced crystal structures, since they play the role of nucleating particles in the process of polymer crystallization. With an increase in the concentration of calcium phosphates, the strength characteristics of the composites are significantly reduced, although the packing density of the amorphous phase decreases due to the introduction of CP.

Keywords: calcium phosphates, polyhydroxyalkanoates, tricalcium phosphate, octacalcium phosphate,
poly(-3-hydroxybutyrate-4-hydroxybutyrate).

DOI: 10.30791/1028-978X-2026-6-15-25

Reference citing:
Fedotov A.Yu., Tyubaeva P.M., Baranov O.V., Lobzhanidze P.V., Mihailov I.A., Varyan I.A., Merzlikin V.A., Romanov R.R., Karpova S.G., Egorov A.A., Generalov E.M., Komlev V.S. Issledovanie vliyaniya fosfatov kal'ciya na strukturu i svojstva poli(-3-gidroksibutirata-4-gidroksibutirata) [Investigation of the effect of calcium phosphates on the structure and properties of poly(-3-hydroxybutyrate-4-hydroxybutyrate) ]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2026, no. 6, pp. 12 – 25. DOI: 10.30791/1028-978X-2026-6-15-25

ПЕРСПЕКТИВНЫЕ МАТЕРИАЛЫ

Features of thermal behavior of nanocrystalline ceria
in the presence of oxygen-free graphene

I. V. Ponomarev, E. A. Trusova, A. S. Lysenkov, B. A. Rumyantsev

A comparative study of the morphology, phase composition, and thermal behavior of nanocrystalline ceria powder and graphene-containing composites based on it, which were synthesized using two methods combining sol-gel and sonochemical techniques, has been conducted. In one case, ceria crystallization occurred on the oxygen-free graphene sheets as a result of the interaction of Ce-containing sol and few-layer graphene suspension in an N,N-dimethyloctylamine-aqua emulsion. In another case, the graphene sheets were deposited on ceria nanocrystallites by combining the suspensions of ceria and graphene in an isopropanol-aqua mixture. It was found that the introduction of less than 1 wt. % graphene leads to a decrease in the sintering temperature of nanocrystalline ceria by 175 °C if the composite was obtained from a Ce-containing sol, and by 212 °C if a nanocrystallite ceria was used for this purpose. The shapes of the shrinkage curves and shrinkage rates of composites also differ, and in both cases there are significant differences from the data for pure nanocrystallite ceria obtained under the same conditions.

Keywords: nano-ceria, nanostructured composites graphene-ceria, oxygen-free graphene, dilatometry.

DOI: 10.30791/1028-978X-2026-6-26-38

Reference citing:
Ponomarev I.V., Trusova E.A., Lysenkov A.S., Rumyantsev B.A. Osobennosti termicheskogo povedeniya nanokristallicheskogo SeO2 v prisutstvii beskislorodnogo grafena [Features of thermal behavior of nanocrystalline ceria in the presence of oxygen-free graphene]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2026, no. 6, pp. 26 – 38. DOI: 10.30791/1028-978X-2026-6-26-38

ПЕРСПЕКТИВНЫЕ МАТЕРИАЛЫ

Study of the process of structuring styrene-butadiene rubber with the participation
of ethylphenylsilylcarbamide and 2-amino-4,6-bis(trichlormethyl)silyl triazine

A. F. Mamedova, B. A. Mamedov, O. V. Askerov, S. S. Mashaeva,
Sh. M. Mamedov, D. Sh. Mamedov

The role of a new class of active low-molecular compounds, ethylphenylsilylcarbamide and 2-amino-4,5-bis-trichloromethylsilyl triazine, as an accelerator of crosslinking and vulcanization of styrene-butadiene rubber has been studied. In the systems styrene-butadiene rubber-30 + ethylphenylsilylcarbamide + ZnO, styrene-butadiene rubber-30 + 2-amino-4,5-bis-trichloromethylsilyl triazine+ZnO, it has been found that the introduction of ethylphenylsilylcarbamide significantly improves the rheological and structural parameters of these systems. First of all, ethylphenylsilylcarbamide was synthesized. The yield of the final product was 86 %. The process of crosslinking styrene-butadiene rubber was carried out in the presence of ethylphenylsilylcarbamide. To protect the mixtures from oxidation and destruction of polymer chains during mechanical plasticization, the antioxidant 2-amino-4.6-bis(trichloromethyl)-sulfonyl triazine was used, and to accelerate the process of crosslinking of styrene-butadiene rubber – ZnO. A polymer plasticizer (a mixture of polyvinyl chloride and petroleum oil) was used as a plasticizer. Using physicochemical and spectral methods, changes in the molecular structure and spatial networks of styrene-butadiene rubber in the presence of ethylphenylsilylcarbamide and 2-amino-4,5-bis-trichloromethylsilyl triazine and zinc oxide were determined. The yield of crosslinking and the occurrence of the number of active chains of the network in the elastomer were found for each studied system depending on the crosslinking time. By determining the transformation of butadiene-styrene rubber, the radical mechanism of the crosslinking reaction was confirmed by FTIR and EPR spectroscopy. It was found that the introduction of low-molecular additives of polymer plasticizer and technical carbon provides physical and mechanical properties, as well as effective protection of elastomer materials from temperature aging. According to the results of the studies, it was evident that the plasticization of the elastomer increases with an increase in the number of polar groups (N, NH, Cl, Si) in the composition.

Keywords: rubber, sol-gel, crosslinking, vulcanization, aging, viscosity, rheology, viscometer, Mooney, solvent, extraction.

DOI: 10.30791/1028-978X-2026-6-39-48

Reference citing:
Mamedova A.F., Mamedov B.A., Askerov O.V., Mashaeva S.S., Mamedov Sh.M., Mamedov D.Sh. Issledovanie processa strukturirovaniya butadien-stirol'nogo kauchuka s uchastiem etilfenilsililkarbamida i 2-amino-4,6-bis(trihlormetil)silil triazina [Study of the process of structuring styrene-butadiene rubber with the participation of ethylphenylsilylcarbamide and 2-amino-4,6-bis(trichlormethyl)silyl triazine]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2026, no. 6, pp. 39 – 48. DOI: 10.30791/1028-978X-2026-6-39-48

ПЕРСПЕКТИВНЫЕ МАТЕРИАЛЫ

Phase composition, structure, and properties of titanium aluminide-based materials produced by free SHS-compression

A. D. Bazhina, A. S. Ivanov, M. S. Antipov, A. P. Chizhikov, P. M. Bazhin

This study focuses on the production of intermetallic materials based on titanium aluminides (TiAl and Ti3Al) from initial titanium and aluminum powder blends using the free SHS-compression method. This approach combines self-propagating high-temperature synthesis (SHS) with high-temperature shear deformation of combustion products. To elucidate the phase formation mechanism, combustion temperatures and propagation rates were measured for the studied compositions. It was found that under free SHS-compression conditions, these parameters decrease with an increasing proportion of free titanium and a decreasing aluminum content in the initial mixture. The study demonstrates that early contact between the synthesized material and the press plunger during free SHS-compression facilitates the completion of phase formation processes. The influence of the titanium-to-aluminum powder ratio in the initial mixture on the phase composition, microstructure, and mechanical properties (microhardness, elastic modulus, elastic recovery) was systematically investigated. It was established that the composition consisting of 74 wt.% Ti3Al and 26 wt.% TiAl exhibits the highest microhardness and elastic recovery, while the composition consisting of 86 wt.% TiAl and 14 wt.% Ti3Al exhibits the maximum elastic modulus.

Keywords: intermetallic compound, free SHS compression, combustion, mechanical properties.

DOI: 10.30791/1028-978X-2026-6-49-57

Reference citing:
Bazhina A.D., Ivanov A.S., Antipov M.S., Chizhikov A.P., Bazhin P.M. Fazovyj sostav, stroenie i svojstva materialov na osnove alyuminidov titana, poluchennyh v usloviyah svobodnogo SVS-szhatiya [Phase composition, structure, and properties of titanium aluminide-based materials produced by free SHS-compression]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2026, no. 6, pp. 49 – 57. DOI: 10.30791/1028-978X-2026-6-49-57

ПЕРСПЕКТИВНЫЕ МАТЕРИАЛЫ

Preparation and extrusion processing of modified polyetherimides with enhanced heat resistance

D. P. Bulkatov, A. G. Khina, I. P. Storozhuk, V. S. Buryakov, A. S. Kuleznev,
I. V. Tretyakov, A. V. Kireynov, Z. A. Lokyaeva, D. G. Melikyants, S. V. Grishin

The work reports the synthesis and study of thermal, mechanical and processing properties of copolyetherimides that contain rigid-chain segments of commercially available dianhydrides. It is shown that incorporating rigid segments into the macromolecular chains increases the glass transition temperature and the thermo-oxidative stability of the polymers, but is accompanied by a decrease in melt flow and a partial deterioration of mechanical properties. As a result of analyzing the experimental data, a composition with an optimal overall balance of properties was identified; it exhibits heat resistance 15 – 20 °C higher than the original unmodified polyetherimide while retaining mechanical properties and a melt flow index at an acceptable level. A key outcome of this work is the successful extrusion processing of the developed copolyetherimide into pellets without significant thermo-oxidative degradation, thereby preserving its mechanical properties. The obtained data confirm the prospects of a method of copolymerization with rigid-chain dianhydrides for creating structural polyetherimides with an extended temperature range and indicate the broad application potential of the developed materials.

Keywords: thermoplastics, high-performance thermoplastics, polyetherimides, copolymers, thermal properties, mechanical properties, melt flow index, extrusion.

DOI: 10.30791/1028-978X-2026-6-58-68

Reference citing:
Bulkatov D.P., Khina A.G., Storozhuk I.P., Buryakov V.S., Kuleznev A.S., Tretyakov I.V., Kireynov A.V., Lokyaeva Z.A., Melikyants D.G., Grishin S.V. Poluchenie modificirovannyh poliefirimidov s povyshennoj teplostojkost'yu i ih pererabotka metodom ekstruzii [Preparation and extrusion processing of modified polyetherimides with enhanced heat resistance]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2026, no. 6, pp. 58 – 68. DOI: 10.30791/1028-978X-2026-6-58-68

ПЕРСПЕКТИВНЫЕ МАТЕРИАЛЫ

Study of regularities of obtaining carbon material during
high-temperature pyrolysis of methane in a corundum tube

M. S. Galtsov-Tsientsiala, A. O. Dudoladov, A. V. Grigorenko,
M. S. Vlaskin, G. I. Dzhardimalieva

Methane pyrolysis is one of the promising methods for producing hydrogen, and one of the main problems of methane pyrolysis technology is clogging of the reactor space with the resulting soot. Methane pyrolysis experiments were carried out at temperatures of 1000, 1050, 1100, 1200 and 1400 °C at methane flow rates of 1 and 5 l/min, for 1 hour. Gaseous products were analyzed by gas chromatography. The composition, morphology and textural characteristics of the soot were studied by SEM (scanning electron microscopy), BET (Brunauer-Emmett-Teller method) and ICP-MS (inductively coupled plasma mass spectrometry). With an increase in the pyrolysis process temperature from 1000 to 1200 °C, the hydrogen yield increased from 28.64 to 92.74 % and from 1.10 % to 72.09 % at a methane flow rate of 1 and 5 l/min, respectively. The soot yield increased from 1.28 g at 1000 °C to 43.9 g at 1400 °C (at a methane flow rate of 1 l/min). With an increase in the methane flow rate from 1 to 5 l/min, the soot yield at 1200 °C increased almost twofold and amounted to 75.65 g. It was found that in the reactor zone where maximum heating occurs, the accumulated soot sinters and forms dense growths. At 1050 °C, the size of the soot particles changes from 155 to 650 nm, at 1200 °C — from 157 to 896 nm, at 1400 °C — from 77 to 532 nm. The purity of the obtained carbon black was about 99.95 %. This study is useful in selecting materials and technical solutions for a pilot methane pyrolysis plant.

Keywords: hydrogen, carbon black, high-temperature methane pyrolysis, soot, soot deposits, corundum tube.

DOI: 10.30791/1028-978X-2026-6-69-82

Reference citing:
Galtsov-Tsientsiala M.S., Dudoladov A.O., Grigorenko A.V., Vlaskin M.S., Dzhardimalieva G.I. Issledovanie zakonomernostej polucheniya uglerodnogo materiala pri vysokotemperaturnom pirolize metana v korundovoj trube [Study of regularities of obtaining carbon material during high-temperature pyrolysis of methane in a corundum tube]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2026, no. 6, pp. 69 – 82. DOI: 10.30791/1028-978X-2026-6-69-82