Персона:
Менушенков, Алексей Павлович

Организационные подразделения

Организационная единица

Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

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Менушенков

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Алексей Павлович

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Теперь показываю 1 - 10 из 43

Только метаданные
Influence of the Ln type and temperature on the crystal, local, and electronic structures of Ln chromates/chromites
(2025) Popov, V. V.; Menushenkov, A. P.; Zubavichus, Y. V.; Yastrebtsev, A. A.; Gaynanov, B. R.; Dubyago, F. E.; Ivanov, A. A.; Rudakov, S. G.; Berdnikova, M. M.; Pisarev, A. A.; Попов, Виктор Владимирович; Менушенков, Алексей Павлович; Ястребцев, Алексей Алексеевич; Гайнанов, Булат Радикович; Иванов, Андрей Анатольевич; Рудаков, Сергей Геннадьевич; Бердникова, Мария Михайловна; Писарев, Александр Александрович
Только метаданные
A XAFS investigation of amorphous-to-crystalline and fluorite-to-pyrochlore phase transitions in Ln2M2O7 (Ln = Gd, Tb, Dy; M = Ti, Zr)
(2020) d'Acapito, F.; Puri, A.; Popov, V. V.; Menushenkov, A. P.; Ivanov, A. A.; Yastrebtsev, A. A.; Gaynanov, B. R.; Попов, Виктор Владимирович; Менушенков, Алексей Павлович; Иванов, Андрей Анатольевич; Ястребцев, Алексей Алексеевич; Гайнанов, Булат Радикович
© 2019 Elsevier LtdAmorphous-to-crystalline and fluorite-to-pyrochlore phase transitions in complex oxides Ln2M2O7 (Ln = Gd, Tb, Dy; M = Ti, Zr) prepared by sol-gel and coprecipitation methods were studied using x-ray absorption spectroscopy in combination with x-ray diffraction and Raman spectroscopy. The Ln titanates crystallize directly from the amorphous state to the pyrochlore structure, while the Ln zirconates form the intermediate fluorite phase first. We have found that both XANES and EXAFS data reflect the considerable difference between the crystallization processes of Ln titanates and zirconates. In particular the evolution of the K–Ti pre-edge features is a good indicator of the phase transition from amorphous to crystalline state. The splitting of the first Ln-O shell in the FT modulus of L3-Ln edge EXAFS spectra in Ln titanates can be regarded as a fingerprint of the ordered pyrochlore structure formation which is accompanied also by specific changes in the main features of the XANES spectra. For the Ln zirconates these features are less pronounced.
Только метаданные
Control over crystal, local atomic and electronic structures of cerium chromates/chromites via the synthesis conditions
(2023) Popov, V. V.; Menushenkov, A. P.; Dubyago, F. E.; Yastrebtsev, A. A.; Ivanov, A. A.; Rudakov, S. G.; Попов, Виктор Владимирович; Менушенков, Алексей Павлович; Ястребцев, Алексей Алексеевич; Иванов, Андрей Анатольевич; Рудаков, Сергей Геннадьевич
Только метаданные
Effect of the Chemical and Phase Composition of Nanocrystalline Gadolinium Complex Oxides on the Propane Cracking Process
(2020) Markova, E. B.; Kovtun, S. O.; Tereshina, T. A.; Shchetinin, I. V.; Popov, V. V.; Menushenkov, A. P.; Yastrebtsev, A. A.; Molokova, A. Y.; Попов, Виктор Владимирович; Менушенков, Алексей Павлович; Ястребцев, Алексей Алексеевич
© 2020, Pleiades Publishing, Ltd.Abstract: Effect of the chemical composition and crystal structure type of gadolinium complex oxides on their catalytic activity is studied. It is shown that nanocrystalline powders Gd2Ti2O7, Gd2Zr2O7, and Gd2Hf2O7 form highly symmetrical face-centered сubic crystal structures having localized (in Gd2Ti2O7) and delocalized (in Gd2Zr2O7 and Gd2Hf2O7) oxygen vacancies. At the same time, low-symmetrical crystal structures are formed in Gd2(WO4)3 (the monoclinic structure) and Gd2(МоO4)3 (a mixture of monoclinic and rhombic structures). Catalytic runs show that formation of the cubic structure contributes to an increase in the degree of conversion of propane and causes a shift in cracking temperatures to lower values. Formation of this type of nanocrystalline oxides facilitates the dehydrogenation reaction with propylene selectivity up to 80% at temperatures up to 700 К. Formation of the mixture of monoclinic and rhombic structures in Gd2(МоO4)3 leads to a shift in the degree of conversion to the catalytic temperature range of 700–900 К, in which the dehydrogenation reaction predominates (80%). In the case of the monoclinic structure of Gd2(WO4)3 in the same cracking temperature ranges the process of degradation occurs in parallel; this decreases propylene selectivity to 50% and promotes an increase in the yield of ethylene to 30%.
Только метаданные
High spatial coherence and short pulse duration revealed by the Hanbury Brown and Twiss interferometry at the European XFEL
(2021) Gerasimova, N.; Mercurio, G.; Assalauova, D.; Carnis, J.; Khubbutdinov, R.; Menushenkov, A. P.; Vartanyants, I. A.; Менушенков, Алексей Павлович
© 2021 Author(s).Second-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft x-ray Self-Amplified Spontaneous Emission (SASE3) undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode. Two high-power regimes of the SASE3 undulator settings, i.e., linear and quadratic undulator tapering at saturation, were studied in detail and compared with the linear gain regime. The statistical analysis showed an exceptionally high degree of spatial coherence up to 90% for the linear undulator tapering. Analysis of the measured data in spectral and spatial domains provided an average pulse duration of about 10 fs in our measurements. The obtained results will be valuable for the experiments requiring and exploiting short pulse duration and utilizing high coherence properties of the EuXFEL.
Только метаданные
Features of the Electronic and Local Atomic Structures of Erbium Complexes of Tetraphenylporphyrin: Analysis of the Data of Photoelectron Spectroscopy and X-Ray Absorption Spectroscopy
(2023) Mozhchil, R. N.; Ionov, A. M.; Bozhko, S. I.; Rumyantseva, V. D.; Menushenkov, A. P.; Менушенков, Алексей Павлович
Только метаданные
The synthesis and studies of crystal/local structures and morphology of hydrated molybdenum oxides
(2021) Khramov, E. V.; Zubavichus, Y. V.; Shchetinin, I. V.; Ponkratov, K. V.; Popov, V. V.; Menushenkov, A. P.; Yastrebtsev, A. A.; Molokova, A. Y.; Pisarev, A. A.; Попов, Виктор Владимирович; Менушенков, Алексей Павлович; Ястребцев, Алексей Алексеевич; Писарев, Александр Александрович
© 2021 Elsevier Inc.The crystal/local structure and morphology of hydrated molybdenum oxides particles obtained by acidic precipitation of molybdates solutions were studied using X-ray diffraction, X-ray absorption spectroscopy, scanning electron microscopy, Raman and IR spectroscopy. The precipitation of ammonium heptamolybdate solutions (pH = 1.00) at room temperature result in the formation of poorly crystallized hydrated molybdenum oxides. At the same time, acidification of the sodium molybdate solutions does not lead to the appearance of precipitates for several days. Heating to 90 °C and aging the reaction suspension prepared from both ammonium heptamolybdate and sodium molybdate results in the formation of prismatic h-MoO3 particles with the hexagonal crystal structure. It was shown that distorted octahedra MoO6 are the basic structural units in the formed hydrated molybdenum oxides. Along with the presence of Mo[dbnd]O and Mo–O bonds, the presence of water molecules, hydroxyl ions, and NH4+ (or Na+) ions was detected in the structure of hydrated MoO3. The type of Mo salt and acid significantly affects the morphology of h-MoO3 particles. Large h-MoO3 particles are formed by aggregation of small ones and Ostwald ripening due to the “dissolution - precipitation” process.
Только метаданные
The effect of the synthesis conditions on the structure and phase transitions in Ln2(MoO4)3
(2021) Svetogorov, R. D.; Tsarenko, N. A.; Ponkratov, K. V.; Ognevskaya, N. V.; Popov, V. V.; Menushenkov, A. P.; Yastrebtsev, A. A.; Molokova, A. Y.; Rudakov, S. G.; Попов, Виктор Владимирович; Менушенков, Алексей Павлович; Ястребцев, Алексей Алексеевич; Рудаков, Сергей Геннадьевич
© 2020 Elsevier Masson SASThe effect of the lanthanide cation type and calcination temperature on the structure and phase transitions in Ln2(MoO4)3 molybdates was studied using synchrotron X-ray diffraction, infrared and Raman spectroscopy, photoluminescence, simultaneous thermal analysis and inductively coupled plasma atomic emission spectroscopy. It was found that the crystallization of the precursors at 500∘ C/3 h results in the formation of nanocrystalline powders with the monoclinic structure (sp. gr. I112/b (15)) for Ln2(MoO4)3 (Ln = La–Ho), and a mixture of orthorhombic (sp. gr. Pnca(60)) and tetragonal (sp. gr. I41/a(88)) phases for Yb2(MoO4)3. A further increase in temperature to 1000∘ C leads to a significant rearrangement of the crystal structure, which is largely determined by the lanthanide type. The diagram of phase relations in the Ln2(MoO4)3 molybdates as a function of the Ln3+ cation radius and the calcination temperature has been refined. According to the results of Raman and IR spectroscopy, MoO4 tetrahedra are the main structural units in Ln molybdates. The increased hygroscopicity of heavy lanthanide molybdates (Ln = Ho, Yb) is associated with the presence of empty cavities in the orthorhombic structure. The photoluminescence spectra have shown that EuOn polyhedra in Eu2(MoO4)3 are distorted, and Eu3+ ions occupy several nonequivalent crystallographically different sites with a low symmetry point group.
Только метаданные
Direct evidence of real-space pairing in BaBiO3
(2024) Menushenkov, A. P.; Ivanov, A.; Neverov, V.; Lukyanov, A.; Krasavin, A.; Yastrebtsev, A. A.; Kovalev, I. A.; Kuznetsov, A. V.; Popov, V.; Krymskaya, O.; Менушенков, Алексей Павлович; Иванов, Андрей Анатольевич; Неверов, Вячеслав Дмитриевич; Лукьянов, Александр Евгеньевич; Красавин, Андрей Валерьевич; Ястребцев, Алексей Алексеевич; Кузнецов, Алексей Владимирович; Попов, Виктор Владимирович; Крымская, Ольга Александровна
Только метаданные
Influence of synthesis conditions on the crystal, local, and electronic structures of high-entropy lanthanide hafnates Ln2Hf2O7
(2026) Yastrebtsev, A. A.; Popov, V. V.; Menushenkov, A. P.; Ivanov, A .A.; Gaynanov, B. R.; Rudakov, S. G.; Berdnikova, M. M.; Pisarev, A. A.; Ястребцев, Алексей Алексеевич; Попов, Виктор Владимирович; Менушенков, Алексей Павлович; Иванов, Андрей Анатольевич; Гайнанов, Булат Радикович; Рудаков, Сергей Геннадьевич; Бердникова, Мария Михайловна; Писарев, Александр Александрович