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Effect of substitution on magnetic properties of CuB2O4 / Sablina K.A., Udod L.V., Pankrats A.I., Velikanov D.A., Vasilev A.D., A.F. Bovina, Bondarenko G.V. // Moscow International Symposium on Magnetism, Moscow, 2008, p.687

Доп.точки доступа:
Sablina, K. A.; Саблина, Клара Александровна; Udod, L. V.; Удод, Любовь Викторовна; Pankrats, A. I.; Панкрац, Анатолий Иванович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Bovina, A. F.; Бовина, Ася Федоровна; Bondarenko, G. V.; Бондаренко, Геннадий Васильевич
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Effect of central cation substitution on the properties and phase transitions in (NH4)3Me(O2)2F4 oxyfluorides [Text] / V. D. Fokina, I. N. Flerov [et al.] // The 6th International Seminar on Ferroelastics Physics (ISFP-6) : Voronezh, September 22–25, 2009. - P43

Доп.точки доступа:
Fokina, V.D.; Flerov, I.N.; Molokeev, M.S.; Pogoreltsev, E.I.; Bogdanov, E.V.; Laptash, N.M.; International Seminar on Ferroelastic Physics(6 ; 2009 ; Sept. ; 22-25 ; Voronezh)
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Invar effect and solid-state synthesis in Ni/Fe(001)/MgO(001) thin films: structural and magnetic studies / V. G. Myagkov, V. C. Zhigalov, L. E. Bykova, G. N. Bondarenko // Байкальская международная конференция”Магнитные материалы: Новые технологии”, Россия, Иркутск, 2008, С.56

Доп.точки доступа:
Myagkov, V. G.; Мягков, Виктор Григорьевич; Zhigalov, V. S.; Жигалов, Виктор Степанович; Bykova, L. E.; Быкова, Людмила Евгеньевна; Bondarenko, G. N.; Бондаренко, Галина Николаевна
}
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Phase transitions in (NH4)2MoO2F4: effect of hydrostatic and chemical pressure [Text] / Bogdanov E., Fokina V., Flerov I., Gorev M., Vasiliev A., Pogoreltsev E., Laptash N. // 9th Russai/CIS/Baltic/Japan symposium on ferroelectricity : abstracts book : June 15-19, 2008, Vilnius, Lithuania. - p. 139

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Laptash, N. M.; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(9 ; 2008 ; May ; Vilnus, Lithuania)
}
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Kondo effects in variable-valence manganese-substituted thulium selenide / O. B. Romanova, S. S. Aplesnin, M. N. Sitnikov [et al.] // Ceram. Int. - 2024. - Vol. 50, Is. 18, Pt. B. - P. 33555-33561, DOI 10.1016/j.ceramint.2024.06.171. - Cited References: 31. - The authors would like to express their deepest gratitude to the researcher A.I. Galyas from Scientific-Practical Materials Research Center NAS, Minsk for the synthesis of samples MnXTm1-XSe . - ISSN 0272-8842. - ISSN 1873-3956
Кл.слова (ненормированные):
Impedance -- Magnetic properties -- Thermopower -- Kondo effect
Аннотация: The MnXTm1‒XSe (0 ≤ Х ≤ 0.2) solid solutions have been first synthesized and their structural, magnetic, and transport properties have been studied in the temperature range of 80–1000 K and magnetic fields of up to 12 kOe. The surface morphology of the samples has been examined and the chemical analysis has been carried out. It is shown that the valence change with the increasing substitution concentration is accompanied by a change in the lattice parameter and a decrease in the magnetic moment of the samples. The Kondo temperatures caused by the manganese and thulium subsystem have been found in the low- and room-temperature regions. The temperature of localization of small-radius polarons has been determined. A drastic decrease in the relaxation time in the range of the manganese ion percolation through the lattice in the MnXTm1‒XSe system has been established. The change of the current carrier type upon variation in the temperature and substitution concentration was determined from the Seebeck coefficient. A high-temperature extremum of thermopower was revealed, which is explained within the framework of the Anderson model.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russia
Scientific-Practical Materials Research Center NAS, Minsk, Belarus

Доп.точки доступа:
Romanova, O. B.; Романова, Оксана Борисовна; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Sitnikov, M.N.; Udod, L. V.; Удод, Любовь Викторовна; Shabanov, A. V.; Шабанов, Александр Васильевич; Goncharov, V.S.; Zhivulko, A.M.; Yanushkevich, K.I.
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    Bobrov, P. P.
    The effect of dielectric relaxation processes on the complex dielectric permittivity of soils at frequencies from 10 kHz to 8 GHz—Part II: Broadband analysis / P. P. Bobrov, E. S. Kroshka, K. V. Muzalevskiy // IEEE Trans. Geosci. Remote Sens. - 2024. - Vol. 62. - Ст. 2000411, DOI 10.1109/TGRS.2023.3340693. - Cited References: 51 . - ISSN 0196-2892. - ISSN 1558-0644
   Перевод заглавия: Эффект процессов диэлектрической релаксации на комплексную диэлектрическую проницаемость почв на частотах от 10 кГц до 8 ГГц
Кл.слова (ненормированные):
dielectric measurement -- Dobson dielectric model -- Maxwell–Wagner effect -- refraction-relaxation model -- soil moisture
Аннотация: This article is the second in a series evaluating the effect of dielectric relaxation processes on the relatively effective complex dielectric permittivity (RCP) of soils. Part II is based on the results of experimental measurements in the frequency range 10 kHz to 8–20 GHz. The broadband dielectric spectrum model includes the high-frequency part as a model of the dielectric mixture and the relaxation part as the sum of three relaxation processes modeled by the Debye and Cole–Cole formulas. For modeling the high-frequency part of the spectrum, the Dobson and Mironov models were considered as possible options. As stated in Part I, the influence of relaxation processes on the imaginary part of the RCP extends up to frequencies of units of gigahertz. The increase in the imaginary part in these models was compensated by unrealistically high values of the specific electrical conductivity of free and bound water. We examined the correspondence of these models to experimental data at frequencies above 2–5 GHz, assuming that the conductivity of bound and free water is zero. The parameters of relaxation processes were found while solving the least-square optimization problem using the technique for determining the continuous distribution of relaxation times (DRTs). Found process parameters depend on the content of clay, organic carbon, and moisture of the samples. The more clay is in the soil, the greater the strength of these processes is. The influence of organic carbon with the conditions being equal consists in the reduction of the real and imaginary parts of RCP.

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Держатели документа:
Faculty of Physics, Omsk State Pedagogical University, 644043 Omsk, Russia
Omsk Scientific Center SB RAS (Institute of Radiophysics and Physical Electronics), 644099 Omsk, Russia
Kirensky Institute of Physics Federal Research Center KSC Siberian Branch Russian Academy of Sciences, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Kroshka, E. S.; Muzalevskiy, K. V.; Музалевский, Константин Викторович
}
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The effect of heat treatment on microstructure and martensitic transformation temperatures in Ni44Fe19Ga27Co10 single crystals / E. E. Timofeeva, E. Yu. Panchenko, A. B. Tokhmetova [et al.] // Phys. Scr. - 2024. - Vol. 99, Is. 1. - Ст. 015958, DOI 10.1088/1402-4896/ad16b2. - Cited References: 34. - This work was supported by the Russian Science Foundation (grant No. 21-19-00287) . - ISSN 0031-8949. - ISSN 1402-4896
Кл.слова (ненормированные):
martensitic transformations -- single crystals -- aging -- second phase particles -- microstructure
Аннотация: The microstructure and temperature of martensitic transformation of Ni44Fe19Ga27Co10 single crystals after aging at temperatures from 623 K to 1173 K were studied by electron microscopy and differential scanning calorimetry. The temperature ranges of the second phase precipitation, their lattice structure and volume fraction, and also the modification of the nanodomain structure of the L21+B2 high-temperature phase were determined in dependence on aging temperature. The influence of microstructure parameters on the martensitic transformation temperatures, transformation intervals and thermal hysteresis has been discussed.

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Держатели документа:
Tomsk State University, Novosobornaya square 1, Tomsk, 634050, Russia
Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Timofeeva, E. E.; Panchenko, E. Yu.; Tokhmetova, A. B.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zherdeva, M. V.; Tagiltsev, A. I.; Surikov, N. Yu.; Chumlyakov, Yu. I.
}
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Gavrichkov, V. A.
Lattice source for charge and spin inhomogeneity in 2D perovskite cuprates / V. A. Gavrichkov, S. I. Polukeev // Phys. B: Condens. Matter. - 2024. - Vol. 673. - Ст. 415457, DOI 10.1016/j.physb.2023.415457. - Cited References: 31. - We acknowledge the support of the Russian Science Foundation through grant RSF No. 22-22-00298 . - ISSN 0921-4526. - ISSN 1873-2135
Кл.слова (ненормированные):
Charge inhomogeneity -- Jahn–Teller (pseudo-) effect -- Doped 2D perovskite cuprates -- Phonon chirality
Аннотация: In the work we highlight the structural features of 2D perovskite cuprates (tilted CuO6 octahedra with different orientation with respect to spacer rocksalt layers), where sources of charge and spin inhomogeneity can be hidden. We used the impurity Anderson model with the Jahn–Teller(JT) local cells to show the charge inhomogeneity arises at any low doping concentration x, but disappears when the doping level exceeds threshold concentration xc, and the smaller the magnitudes xc, the larger the area of regions with JT pseudo effect. It is expected that spontaneous chiral symmetry breaking in the dynamic JT state of the stripe CuO2 layer as a whole can lead to the appearance of the goldstone phonon mode. As consequence, the giant thermal Hall effect could be observed in the 2D perovskite cuprates with CuO6 octahedra, rather than with CuO4 squares, e.g. in the Tl-based n layer cuprates or cuprates based on infinite-layer CaCuO2 structure.

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Держатели документа:
L. V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Гавричков, Владимир Александрович
}
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    Влияние замещения в ортоферрите HoFe1-xMnxO3 на особенности фазовой диаграммы при малых концентрациях марганца (х0.1) / К. А. Шайхутдинов, С. В. Семенов, С. А. Скоробогатов, А. Л. Фрейдман // Новое в магнетизме и магнитных материалах : сборник трудов XXV международной конференции / прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2024. - Секция 7 [Сборник 7] : Магнитные фазовые переходы и критические явления. - С. 66-68. - Библиогр.: 4. - РНФ, Красноярский краевой фонд науки, грант № 23-22-10026 . - ISBN 978-5-4465-1869-2
   Перевод заглавия: Effect of substitution in orthoferrite HoFe1-xMnxO3 on the features of the phase diagram at low manganese concentrations (x0.1)
Аннотация: Ортоферриты редкоземельных элементов широко исследованы и проявляют спонтанные магнитные переходы. В то же время, соединения с замещением 3d-элементов исследованы достаточно слабо. В данной работе проведено исследование магнитных свойств монокристаллов ортоферрита гольмия с замещением ионов Fe3+ ионами Mn3+. Из магнитных измерений установлено, что при замещении железа на марганец изменяется тип магнитного ориентационного перехода от перехода II рода (AxFyGz ‒ CxGyFz) к переходу первого рода (AxFyGz ‒ GxCyAz) с наличием слабого ферромагнитного момента только в направлении b (для установки Рnma). Последнее позволяет использовать степень замещения, как инструмент создания материала с заданными магнитными свойствами. Кроме этого, установлено, что при малых концентрациях марганца (x0.1) на фазовой диаграмме HoFe1-xMnxO3 наблюдается более сложный переход AxFyGz ‒ GxCyAz‒ CxGyFz.

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Держатели документа:
Институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук - обособленное подразделение ФИЦ КНЦ СО РАН

Доп.точки доступа:
Исхаков, Рауф Садыкович \прогр. ком.\; Iskhakov, R. S.; Овчинников, Сергей Геннадьевич \прогр. ком.\; Ovchinnikov, S. G.; Шайхутдинов, Кирилл Александрович; Shaikhutdinov, K. A.; Семенов, Сергей Васильевич; Semenov, S. V.; Скоробогатов, Станислав Алексеевич; Skorobogatov, S. A.; Фрейдман, Александр Леонидович; Freydman, A. L.; "Новое в магнетизме и магнитных материалах", международная конференция(25 ; 2024 ; 1-6 июля ; Москва); Научный совет по физике конденсированных сред РАН; МИРЭА - Российский технологический университет; Московский государственный университет им. М.В. Ломоносова; Магнитное общество России
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10.

    Усиление магнитоэлектрического эффекта в композите Bi2Fe4O9/BiFeO3 / Л. В. Удод, С. С. Аплеснин, М. Н. Ситников [и др.] // Новое в магнетизме и магнитных материалах : сборник трудов XXV международной конференции / прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2024. - Секция 7 [Сборник 7] : Магнитные фазовые переходы и критические явления. - С. 82-85. - Библиогр.: 7. - Выполнено в рамках научной тематики госзадания ИФ СО РАН . - ISBN 978-5-4465-1869-2
   Перевод заглавия: Enhancement of the magnetoelectric effect in the Bi2Fe4O9/BiFeO3 composite
Аннотация: The work is dedicated study of effect of the size of Bi2Fe4O9 and BiFeO3 nanoparticles on the magnetoelectric interaction in the Bi2Fe4O9/BiFeO3 composite with a percentage ratio of 67/33 has been studied. Linear and quadratic contributions to the magnetoelectric effect have been established. Model have been proposed to explain the enhancement of the magnetoelectric effect via the migration polarization in mullite and linear magnetoelectric effect in bismuth ferrite.

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Держатели документа:
Институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук - обособленное подразделение ФИЦ КНЦ СО РАН
Сибирский государственный университет науки и технологий имени академика М. Ф. Решетнева

Доп.точки доступа:
Исхаков, Рауф Садыкович \прогр. ком.\; Iskhakov, R. S.; Овчинников, Сергей Геннадьевич \прогр. ком.\; Ovchinnikov, S. G.; Удод, Любовь Викторовна; Udod, L. V.; Аплеснин, Сергей Степанович; Aplesnin, S. S.; Ситников, Максим Николаевич; Sitnikov, M. N.; Романова, Оксана Борисовна; Romanova, O. B.; Зеленов, Ф. В.; "Новое в магнетизме и магнитных материалах", международная конференция(25 ; 2024 ; 1-6 июля ; Москва); Научный совет по физике конденсированных сред РАН; МИРЭА - Российский технологический университет; Московский государственный университет им. М.В. Ломоносова; Магнитное общество России
}
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11.

Enhancement of the magnetoelectric effect in the Bi2Fe4O9/BiFeO3 composite as a result of dipole and migration polarization in mullite / L. V. Udod, S. S. Aplesnin, F. V. Zelenov [et al.] // J. Mater. Sci. - 2024. - Vol. 59, Is. 24. - P. 10763-10775, DOI 10.1007/s10853-024-09885-x. - Cited References: 55 . - ISSN 0022-2461. - ISSN 1573-4803
Аннотация: The effect of the size of Bi2Fe4O9 and BiFeO3 nanoparticles on the magnetoelectric interaction in the Bi2Fe4O9/BiFeO3 composite with a percentage ratio of 67/33 has been studied. The electrostriction and electric polarization on electric and magnetic field in wide temperature range has been measured. The hysteresis of the polarization and I?V characteristics has been found. Temperature ranges with activation and hopping types of conductivity have been found. The mechanism of electric polarization and the crossover temperature from dipole polarization to migration polarization at 260 K have been established. Linear and quadratic contributions to the magnetoelectric effect have been found. Below 120 K the linear contribution is an order of magnitude greater than the quadratic contribution and above 240 K the quadratic contribution to the ME effect prevails. Models have been proposed to explain the enhancement of the magnetoelectric effect as a result of the migration polarization in mullite and linear magnetoelectric effect in bismuth ferrite. The correlation of temperatures of the extremum of the temperature coefficient of the electrical resistance and the magnetic phase transition in mullite at 260 K indicates a polaron-type conductivity and a strong electron?phonon interaction. A change in the sign of the electrostriction coefficient upon heating and the compression temperature of the composite in an electric field was found.

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Держатели документа:
Federal Research Center KSC SB RAS, Kirensky Institute of Physics, Akademgorodok 50, bld. 38, Krasnoyarsk, Russia, 660036
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russia, 660037

Доп.точки доступа:
Udod, L. V.; Удод, Любовь Викторовна; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Zelenov, F. V.; Sitnikov, M. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Romanova, O. B.; Романова, Оксана Борисовна
}
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12.

Investigation of surface magnetism in systems based on MnBi2Te4 using the magneto-optical Kerr effect / D. A. Glazkova, D. A. Estyunin, A. S. Tarasov [et al.] // Crystallogr. Rep. - 2024. - Vol. 69, Is. 1. - P. 79-84, DOI 10.1134/S1063774523601296. - Cited References: 39. - This study was supported by the St. Petersburg State University (project no. 94031444) and the Russian Science Foundation (grant no. 23-12-00016). The samples were synthesized within the project "State Assignment for the Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences and the Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences" . - ISSN 1063-7745. - ISSN 1562-689X
Аннотация: MnBi2Te4, Mn(Bi,Sb)2Te4, and MnBi2Te4(Bi2Te3)m (m ≥ 1) are assigned to magnetic topological insulators. Successful application of these materials in nanoelectronic devices calls for comprehensive investigation of their electronic structure and magnetic properties in dependence of the Bi/Sb atomic ratio and the number m of Bi2Te3 blocks. The magnetic properties of the surface of MnBi2Te4, MnBi4Te7, and Mn(Bi1-xSbx)2Te4 compounds (x = 0.43 and 0.32) have been studied using the magneto-optical Kerr effect. It is shown that the temperatures of magnetic transitions on the surface and in the bulk of MnBi4Te7 and Mn(Bi, Sb)2Te4 differ significantly.

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Публикация на русском языке Исследование поверхностного магнетизма в системах на основе MnBi2Te4 с использованием магнитооптического эффекта Керра [Текст] / Д. А. Глазкова, Д. А. Естюнин, А. С. Тарасов [и др.]. - 6 с. // Кристаллография. - 2024. - Т. 69 № 1. - С. 105-110

Держатели документа:
St. Petersburg State University, 198504, St. Petersburg, Russia
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, 660036, Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660041, Krasnoyarsk, Russia
Krasnoyarsk State Agrarian University, Achinsk Branch, 662155, Achinsk, Russia
Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

Доп.точки доступа:
Glazkova, D. A.; Estyunin, D. A.; Tarasov, A. S.; Тарасов, Антон Сергеевич; Kosyrev, N. N.; Косырев, Николай Николаевич; Komarov, V. A.; Комаров, Василий Андреевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Golyashov, V. A.; Tereshchenko, O. E.; Kokh, K. A.; Koroleva, A. V.; Shikin, A. M.
}
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13.

    Каравайский, Андрей Юрьевич.
    Влияние органического вещества и влажности на пересечение спектров диэлектрической проницаемости почв / А. Ю. Каравайский, Ю. И. Лукин // Журн. радиоэлектрон. - 2024. - № 4. - Ст. 4 ; J. Radio Electron., DOI 10.30898/1684-1719.2024.4.11. - Библиогр.: 31. - Работа выполнена при финансовой поддержке Российского научного фонда и Красноярского краевого фонда поддержки научной и научно-технической деятельности в рамках научного проекта № 22-27-20112 . - ISSN 1684-1719
   Перевод заглавия: The influence of organic matter and volumetric moisture on the crossover of soil dielectric permittivity spectra
Кл.слова (ненормированные):
диэлектрическая проницаемость -- органическая почва -- влажность почв -- пересечение частот -- эффект Максвелла-Вагнера -- dielectric constant -- organic soil -- soil moisture -- crossover point -- Maxwell-Wagner effect
Аннотация: Проведено исследование пересечений спектров вещественной части комплексной диэлектрической проницаемости влажных органических почв с различным содержанием органического вещества от 11 до 54 % в диапазоне частот от 15 МГц до 15 ГГц и в диапазоне температур от 0 до 25 °С. На основании полученных экспериментальных зависимостей предложена эмпирическая модель для оценки среднего значения частот, на которых наблюдается пересечения спектров диэлектрической проницаемости почв, в диапазоне изменений значений этих частот при изменении температуры. Предложенная модель также включает формулу расчета значения объемной влажности, при которой появляется пересечение спектров диэлектрической проницаемости почв.
The present study considers the crossover of the real part spectra of the complex dielectric constant obtained in the frequency range from 15 MHz to 15 GHz and temperature range from 0 to 25 °C for moist organic soils with the content of organic matter varying from 11 to 54 %. Based on the obtained experimental dependences, the empirical model is proposed to estimate the average value of the frequencies at which the crossover point of the soil dielectric constant spectra are observed with temperature changes. The proposed model also includes a formula for calculating the value of volumetric moisture at which the crossover point of the soil dielectric constant spectra appears.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН, 660036, Красноярск, ул. Академгородок 50, стр. 38

Доп.точки доступа:
Лукин, Юрий Иванович; Lukin, Y. I.; Karavaisky, A. Yu.

}
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14.

Unraveling dynamic Jahn-Teller effect and magnetism in FeTiF6×6H2O single crystal / M. S. Platunov, N. A. Fedorova, Yu. V. Pyastolova [et al.] // J. Alloys Compd. - 2024. - Vol. 999. - Ст. 175104, DOI 10.1016/j.jallcom.2024.175104. - Cited References: 51. - The authors thank the Joint Supercomputer Center (JSCC) of the Russian Academy of Sciences. The authors would like to express their sincere gratitude to the ID12 beamline staff their exceptional dedication and professionalism in performing the synchrotron experiment during the challenging circumstances of the COVID-pandemic. We are particularly grateful to the postdocs, scientists, and technicians who took part in the experiment, ensuring its successful completion. We also gratefully acknowledge the provision of beamtime (Proposal HC-4375) by the European Synchrotron Radiation Facility (ESRF). The access to this world-class facility was instrumental in obtaining the high-quality data that formed the basis of our research. We are deeply appreciative of the contributions of all involved, and we extend our heartfelt thanks to each and every one of them . - ISSN 0925-8388. - ISSN 1873-4669
Кл.слова (ненормированные):
Dynamic Jahn-Teller effect -- Density functional theory -- B3LYP -- Magnetic and electronic properties -- Mossbauer spectroscopy -- XMCD -- XANES
Аннотация: Hydrated iron fluoridotitanate (FeTiF6 × 6 H2O) single crystals are fascinating magnetic materials with unique properties. To understand the underlying mechanisms, this study combines X-ray absorption near-edge structure (XANES) and X-ray magnetic circular dichroism (XMCD) techniques, complemented by density functional theory (DFT) calculations. Polarization-dependent X-ray absorption spectroscopy, encompassing XANES and XMCD, is a powerful technique for probing the local structures and magnetic properties of materials. It is element-selective, bulk-sensitive, and compatible with a wide range of experimental conditions. In this study, we used XANES and XMCD spectroscopies to investigate the local structures and magnetic properties of Fe and Ti in FeTiF6 × 6 H2O single crystals. XANES analysis revealed distinct local environments around Fe and Ti, providing insights into their coordination environments. Element-selective magnetization measurement at the Fe K-edge demonstrated that iron sites in the oxidation state Fe2+ have an unambiguous paramagnetic contribution to the magnetization along the b-axis. Notably, the absence of an XMCD signal at the Ti K-edge confirmed the absence of a magnetic moment in Ti atoms within the crystal. DFT calculations corroborate the experimental findings and provide insights into the electronic structure and magnetic interactions. The combined results provide a comprehensive understanding of the dynamic Jahn-Teller effect in FeTiF6 × 6 H2O single crystals, highlighting the significance of polarization-dependent X-ray absorption spectroscopy in unraveling the intricate magnetic behavior of such materials. This study contributes to the fundamental understanding of magnetism in these materials and paves the way for the development of novel magnetic materials with tailored properties.

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Держатели документа:
Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, Kol’tsovo 630559 , Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok 690022, Russia

Доп.точки доступа:
Platunov, M. S.; Платунов, Михаил Сергеевич; Fedorova, N. A.; Федорова, Наталья А.; Pyastolova, Yu. V.; Пястолова, Юлия Валентиновна; Laptash, N. M.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Tomilin, F. N.; Томилин, Феликс Николаевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович
}
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15.

Chemical pressure as an effective tool for tuning the structural disordering and barocaloric efficiency of complex fluorides (NH4)3MF7 (M: Sn, Ti, Ge, Si) / I. N. Flerov, M. V. Gorev, E. V. Bogdanov, N. M. Laptash // J. Phys. D: Appl. Phys. - 2024. - Vol. 57, Is. 17. - Ст. 175301, DOI 10.1088/1361-6463/ad211b. - Cited References: 39. - The study was supported by a Grant from the Russian Science Foundation No. 23-22-00115, https://rscf.ru/project/23-22-00115/ . - ISSN 0022-3727. - ISSN 1361-6463
Кл.слова (ненормированные):
fluorides -- phase transformation -- phase diagram -- entropy -- pressure -- barocaloric effect
Аннотация: Double fluoride salts (NH4)3M4+F7 (M4+: Sn, Ti, Ge, Si) demonstrate a high efficiency of using chemical pressure as a tool for control and tuning structural ordering/disordering, sensitivity to hydrostatic pressure, successions of the phase transitions, etc and, as a result, for purposeful variation within a wide range of parameters of barocaloric effect (BCE). The conventional and inverse BCEs near the triple points were found on the T − p phase diagrams, combination of which can be used to construct original cooling cycle in narrow temperature and pressure ranges. Reconstructive transformation between two cubic phases, Pm3-m ↔ Pa3-, realized in (NH4)3SnF7 at atmospheric pressure and in (NH4)3TiF7 at p ˃ 0.4 GPa are characterized by rather low thermal hysteresis, δT0 = 1 K, and a great entropy change, ΔSBCE = 110–152 J (kg · K)−1, depending on the size of the central atom. At above 300–350 K, a contribution to BCE associated with the regular thermal expansion of the crystal lattice becomes comparable to entropy and temperature changes under pressure in the region of the phase transitions. An analysis of the absolute, relative and integral barocaloric characteristics of (NH4)3M4+F7 compounds showed their high competitiveness with respect to other barocaloric materials considered as promising solid-state refrigerants.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660074 Krasnoyarsk, Russia
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, 660049 Krasnoyarsk, Russia
Institute of Chemistry, Far Eastern Department of RAS, 690022 Vladivostok, Russia

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Laptash, N. M.
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16.

Effect of cobalt concentration on the magnetic properties of the Co1–xMgxFe2O4 nanocrystals / O. S. Ivanova, I. S. Edelman, S. G. Ovchinnikov [et al.] // JETP Lett. - 2024. - Vol. 119, Is. 2. - P. 104-110, DOI 10.1134/S0021364023603457. - Cited References: 26. - The research was carried out at the expense of the Russian Science Foundation Grant # 23-22-10025, https://rscf.ru/project/23-22-10025/, Krasnoyarsk Regional Science Foundation . - ISSN 0021-3640. - ISSN 1090-6487
Аннотация: Nanoparticles of Co1–xMgxFe2O4 with x equal to 0, 0.2, 0.4, 0.6, 0.8 and 1.0 have been synthesized. For all values of x, they are nanocrystals with a cobalt ferrite structure and an average linear size (56 ± 3) nm. Based on the analysis of the Mossbauer effect spectra, the Co2+ ions were shown to occupy only octahedral positions at all values of x. The experimentally obtained dependence of the nanoparticles magnetization on x corresponds to the dependence calculated using the Mossbauer effect data, except for the sample with x = 1.0. The effective magnetic anisotropy constant estimated for 0 K from the analysis of the coercive force temperature dependences decreases from 5.27 × 106 at x = 0 to 1.29 × 106 erg/cm3 at x = 0.8 and drops sharply to 4 × 104 erg/cm3 at x = 1.0

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Публикация на русском языке Влияние концентрации кобальта на магнитные свойства нанокристаллов семейства Co1–xMgxFe2O4 [Текст] / О. С. Иванова, И. С. Эдельман, С. Г. Овчинников [и др.]. - 7 с. // Письма в ЖЭТФ. - 2024. - Т. 119 Вып. 2. - С. 111-117

Держатели документа:
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Amity University Haryana, 122413, Gurugram, Haryana, India

Доп.точки доступа:
Ivanova, O. S.; Иванова, Оксана Станиславовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Thakur, A.; Thakur, P.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Molokeev, M. S.; Молокеев, Максим Сергеевич
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17.

    Machine learning methods in assessing the effect of mixture composition on the physical and mechanical characteristics of road concrete / I. G. Endzhievskaya, A. S. Endzhievskiy, M. A. Galkin, M. S. Molokeev // J. Build. Eng. - 2023. - Vol. 76. - Ст. 107248, DOI 10.1016/j.jobe.2023.107248. - Cited References: 17. - The work was carried out within the framework of the Strategic Academic Leadership Program "Priority-2030" for the Siberian Federal University. The research in field of Machine Learning application was supported by the Tyumen Oblast Government, as part of the West-Siberian Interregional Science and Education Center’s project No. 89-DON (3) . - ISSN 2352-7102
   Перевод заглавия: Методы машинного обучения в оценке влияния состава смеси на физико-механические характеристики дорожного бетона
Кл.слова (ненормированные):
Concrete optimization -- Random forest -- Decision tree -- Machine learning -- Сement concrete roads
Аннотация: Current manuscript presents a study on the use of 48 experimental data points containing parameters of concrete production technological process and its properties, such as strength, density, and bending strength. It was revealed that temporal characteristics, specifically - compressive strength at the age of 3, 7, 28 days, R3, R7, and R28, are significantly correlated with each other, indicating that only one characteristic, such as R28 or Rfl 28, is sufficient for prediction. The absence of multiple correlations between parameters and properties suggests that linear regression analysis may not be accurate. Therefore, the use of Machine Learning is optimal; specifically Random Forest method is preferable due to ease of use and minimum hyperparameters for tuning. Low prediction errors (?1–11%) for 30% of the test data, as determined by the cross-validation method, confirm a relationship between the experimental parameters and the concrete properties. The most important parameters for achieving high values of compressive and bending strengths, R28 and Rfl 28, were identified, namely: air-entraining additives, granite crushed stone consisting of a mixture of fractions 5–20 mm, crushed stone derived from gravel of high strength grains of large fractions 10–20 mm. To obtain explanatory model, another Machine Learning method, that was used, called Decision Tree. The model showed that a high amount of crushed stone 10–20 mm from gravel, more than 212 (kg per 1 m3 of concrete mix), leads to a higher number of strong grains with smooth, rounded surface, thereby, reducing the bending strength of concrete. However, a large concentration of crushed stone mix fractions of 5–20 mm from granite, more than 537 (kg per 1 m3 of concrete mix), leads to the maximum roughness, which makes a significant contribution to the increased strength of concrete due to the adhesion of the matrix and aggregates to each other.

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Держатели документа:
Siberian Federal University, Svobodny Ave., 79, Krasnoyarsk, 660041, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen, 625003, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics SB RAS, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Endzhievskaya, I. G.; Endzhievskiy, A. S.; Galkin, M. A.; Molokeev, M. S.; Молокеев, Максим Сергеевич
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18.

    Novel AMoO4:Eu3+ (A = Ca and Ba) optical thermometer: Investigation of effect of local ionic coordination environment on optical performance and temperature measurement sensitivity / H. Gao, M. S. Molokeev, Q. Chen [et al.] // Ceram. Int. - 2023. - Vol. 49, Is. 16. - P. 26803-26810, DOI 10.1016/j.ceramint.2023.05.217. - Cited References: 52. - The work was supported by the program of Science and Technology International Cooperation Project of Qinghai province (No. 2022-HZ-807) and the National Natural Science Foundation of China (Grant No. 51802172), and was carried out within the framework of the Strategic Academic Leadership Program “Priority-2030′′ for the Siberian Federal University . - ISSN 0272-8842. - ISSN 1873-3956
   Перевод заглавия: Новый оптический термометр AMoO4:Eu3+ (A = Ca и Ba): исследование влияния локального ионного координационного окружения на оптические характеристики и чувствительность измерения температуры
Кл.слова (ненормированные):
Phosphor -- Optical thermometer -- Coordination environment -- Abnormal thermal quenching
Аннотация: A range of Eu3+-doped AMoO4 (A = Ca and Ba) phosphors were successfully synthetized, and their crystal structures, optical performance, and temperature measurement sensitivities were investigated in detail. Peak doping concentration of CaMoO4:Eu3+ phosphor was 0.18, while peak doping concentration of BaMoO4:Eu3+ phosphor may be greater than 0.18. Then, temperature-dependent photoluminescence emission spectra of representative CaMoO4:0.09Eu3+ and BaMoO4:0.03Eu3+ phosphors were recorded. CaMoO4:0.09Eu3+ phosphor exhibited abnormal thermal quenching, which was attributed to defects caused by heterovalent substitution of ions and increase in the temperature, and good thermal stability. Finally, the possibility of using both phosphors as optical thermometers was discussed, which exhibited good temperature sensitivity. However, CaMoO4:0.09Eu3+ phosphor exhibited two peak absolute (Sa, 1.28 %K−1 and 1.39 %K−1) and relative sensitivities (Sr, 1.21 %K−1 and 1.20 %K−1). In addition, variation trend of Sr value with temperature was considerably peculiar. Two optimum Sa and Sr values were attributed to abnormal thermal quenching of CaMoO4:0.09Eu3+ phosphor. Peak Sa and Sr values of BaMoO4:0.03Eu3+ phosphor was 12.39 %K−1 and 0.89 %K−1, respectively. In addition, Sa of AMoO4:Eu3+ phosphor was negatively related to Eu3+ central asymmetry, while peak Sr value was more inclined to appropriate ionic central asymmetry.

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Держатели документа:
School of Mechanical Engineering, Qinghai University, Xining, 810016, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China

Доп.точки доступа:
Gao, Huabo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chen, Qi; Min, Xin; Ma, Bin
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19.

Effect of monomers of 3-hydroxyhexanoate on properties of copolymers poly(3-hydroxybutyrate-co 3-hydroxyhexanoate) / T. G. Volova, M. V. Uspenskaya, E. G. Kiselev [et al.] // Polymers. - 2023. - Vol. 15, Is. 13. - Ст. 2890, DOI 10.3390/polym15132890. - Cited References: 99. - The study was funded by the Russian Science Foundation (project No 23-64-10007) . - ISSN 2073-4360
Кл.слова (ненормированные):
P(3HB-co-3HHx) copolymers -- P(3HB) homopolymer -- various synthesis conditions -- molecular weight -- crystallinity -- thermal properties -- isothermal crystallization -- spherulites
Аннотация: The properties of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) P(3HB-co-3HHx) copolymers with different ratios of monomers synthesized by the wild-type strain Cupriavidus necator B-10646 on sugars, and an industrial sample from Kaneka synthesized by the recombinant strain C. necator NSDG-ΔfadB1 on soybean oil, were studied in a comparative aspect and in relation to poly(3-hydroxybutyrate) P(3HB). The copolymer samples, regardless of the synthesis conditions or the ratio of monomers, had reduced values of crystallinity degree (50–60%) and weight average molecular weight (415–520 kDa), and increased values of polydispersity (2.8–4.3) compared to P(3HB) (70–76%, 720 kDa, and 2.2). The industrial sample had differences in its thermal behavior, including a lower glass transition temperature (−2.4 °C), two peaks in its crystallization and melting regions, a lower melting point (Tmelt) (112/141 °C), and a more pronounced gap between Tmelt and the temperature of thermal degradation (Tdegr). The process, shape, and size of the spherulites formed during the isothermal crystallization of P(3HB) and P(3HB-co-3HHx) were generally similar, but differed in the maximum growth rate of the spherulites during exothermic crystallization, which was 3.5–3.7 μm/min for P(3HB), and 0.06–1.25 for the P(3HB-co-3HHx) samples. The results from studying the thermal properties and the crystallization mechanism of P(3HB-co-3HHx) copolymers are important for improving the technologies for processing polymer products from melts.

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Держатели документа:
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, Akademgorodok 50/50, 660036 Krasnoyarsk, Russia
School of Fundamental Biology and Biotechnology, Siberian Federal University, Svobodnyi Av. 79, 660041 Krasnoyarsk, Russia
Chemical Engineering Center, Research Institute «Bioengineering» ITMO University, Kronverksky Pr. 49, 197101 Saint Petersburg, Russia
L. V. Kirensky Institute of Physics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, Akademgorodok 50/38, 660036 Krasnoyarsk, Russia
Basic Department of Solid State Physics and Nanotechnology, School of Engineering Physics and Radio Electronics, Siberian Federal University, Kirensky St. 26, 660074 Krasnoyarsk, Russia

Доп.точки доступа:
Volova, Tatiana G.; Uspenskaya, Mayya V.; Kiselev, Evgeniy G.; Sukovatyi, Aleksey G.; Zhila, Natalia O.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Shishatskaya, Ekaterina I.
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20.

Lateral photovoltaic effect in silicon-based hybrid structures under external magnetic field / I. A. Bondarev, M. V. Rautskii, N. V. Volkov [et al.] // Mater. Sci. Semicond. Process. - 2023. - Vol. 167. - Ст. 107786, DOI 10.1016/j.mssp.2023.107786. - Cited References: 32 . - ISSN 1369-8001. - ISSN 1873-4081
Кл.слова (ненормированные):
Lateral photovoltaic effect -- MIS structures -- Interface states -- Schottky field
Аннотация: Charge transport in semiconductor devices is highly sensitive to light, which opens up wide application prospects. The lateral photovoltaic effect (LPE) is widely used in position sensitive detectors due to its high sensitivity to the light spot position. We report on the features of the LPE in silicon-based metal/insulator/semiconductor structures at helium temperatures. To investigate the LPE, Fe/SiO2/p-Si and Mn/SiO2/n-Si structures have been fabricated by molecular beam epitaxy. It has been found by studying the lateral photovoltage that the SiO2/Si interface plays a significant role in transport of photogenerated carriers, mainly via the interface states, which induce electron capture/emission processes at certain temperatures. The value of the photovoltage is likely affected not only by the metallic film thickness, but also by the substrate conductivity type and Schottky barrier. The effect of the magnetic field on the LPE is driven by two mechanisms. The first one is the well-known action of the Lorentz force on photogenerated carriers and the second one is shifting of the interface state energy levels. Basically, the magnetic field suppresses the contribution of the interface states to the LPE, which suggests that the interface-induced transport can be controlled magnetically.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Federal Research Center “Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russia
Siberian Federal University, Institute of Engineering Physics and Radio Electronics, Krasnoyarsk, 660041, Russia

Доп.точки доступа:
Bondarev, I. A.; Бондарев, Илья Александрович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Volkov, N. V.; Волков, Никита Валентинович; Lukyanenko, A. V.; Лукьяненко, Анна Витальевна; Yakovlev, I. A.; Яковлев, Иван Александрович; Varnakov, S. N.; Варнаков, Сергей Николаевич; Tarasov, A. S.; Тарасов, Антон Сергеевич
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