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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sablina K. A., Udod L. V., Pankrats A. I., Velikanov D. A., Vasiliev A. D., Bovina A. F., Bondarenko G. V.
Заглавие : Effect of substitution on magnetic properties of CuB2O4
Место публикации : Moscow International Symposium on Magnetism, Moscow, 2008, p.687
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Вид документа : Статья из сборника (однотомник)
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Автор(ы) : Petrov M. I., Gokhfeld Yu. S., Balaev D. A., Popkov S. I., Dubrovskiy A. A., Gokhfeld D. M., Shaykhutdinov K. A.
Заглавие : Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ
Место публикации : 25th International Conference on Low Temperature Physics (LT25). – Amsterdam, Netherlands. - August 6-13. – 2008. – PB-Tu130, p.304
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Fokina V.D., Flerov I.N., Molokeev M.S., Pogoreltsev E.I., Bogdanov E.V., Laptash N.M.
Заглавие : Effect of central cation substitution on the properties and phase transitions in (NH4)3Me(O2)2F4 oxyfluorides
Коллективы : International Seminar on Ferroelastic Physics
Место публикации : The 6th International Seminar on Ferroelastics Physics (ISFP-6): Voronezh, September 22–25, 2009. - С. 43
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Шайхутдинов, Кирилл Александрович, Семенов, Сергей Васильевич, Скоробогатов, Станислав Алексеевич, Фрейдман, Александр Леонидович
Заглавие : Влияние замещения в ортоферрите HoFe1-xMnxO3 на особенности фазовой диаграммы при малых концентрациях марганца (х0.1)
Коллективы : "Новое в магнетизме и магнитных материалах", международная конференция, Научный совет по физике конденсированных сред РАН, МИРЭА - Российский технологический университет, Московский государственный университет им. М.В. Ломоносова, Магнитное общество России
Место публикации : 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. - ISBN 978-5-4465-1869-2
Примечания : Библиогр.: 4. - РНФ, Красноярский краевой фонд науки, грант № 23-22-10026
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yang Ch., Zheng D., Zou X., Dai X., Tang B., Molokeev M. S., Zhang X., Zhang H., Liu Y., Lei B.
Заглавие : Highly-efficiency far-red emission in Cr3+ activated Ca1.8Mg1.2Al2Ge3O12 toward plant precise lighting
Колич.характеристики :9 с
Место публикации : Adv. Opt. Mater. - 2024. - Vol. 12, Is. 17. - Ст.2303235. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202303235
Примечания : Cited References: 48. - The work was supported by the National Natural Science Foundations of China (No. 12274144), the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2023KJ122), the Key Realm R&D Program of Guangdong Province (No. 2021B0707010003), the Guangdong Provincial Science and Technology Project (No. 2022A1515010229), and the Project of GDUPS (2018) for Prof. Bingfu LEI
Аннотация: Far-red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high-performance Cr3+-doped FR phosphors. This study developed a FR phosphor, Ca1.8Mg1.2Al2Ge3O12:Cr3+ (CMAGG: Cr3+), using the cation substitution strategy. Under 438 nm blue light excitation, the phosphors display FR emission centered at 720 nm with a full width at half maximum (FWHM) of 91 nm. Benefit from the favorable match with the FR phytochrome (Pfr), the phosphor is combined with InGaN blue light chips to create a FR phosphor-converted light-emitting diode (pc-LED), which is used in Italian lettuce growth experiments and it results shown in a 15% increase in fresh weight and a 6.5% increase in dry weight. Notably, supplemental FR light modulated its growth morphology. The results of this study will be useful for further research on novel Cr3+-doped FR phosphors to meet the precise spectral requirements for plant growth.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang S., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Atuchin V.
Заглавие : Structural and spectroscopic effects of Li+ substitution for Na+ in LixNa1–xCaLa0.5Er0.05Yb0.45(MoO4)3 upconversion scheelite-type phosphors
Место публикации : Crystals. - 2023. - Vol. 13, Is. 2. - Ст.362. - ISSN 20734352 (eISSN), DOI 10.3390/cryst13020362
Примечания : Cited References: 63. - This study was funded by the Research Program through the Campus Research Foundation funded by Hanseo University in 2022 (2022046)
Аннотация: New triple molybdates LixNa1−xCaLa0.5(MoO4)3:Er3+0.05/Yb3+0.45 (x = 0, 0.05, 0.1, 0.2, 0.3) were manufactured successfully using the microwave-assisted sol-gel-based technique (MAS). Their room-temperature crystal structures were determined in space group I41/a by Rietveld analysis. The compounds were found to have a scheelite-type structure. In Li-substituted samples, the sites of big cations were occupied by a mixture of (Li, Na, La, Er, Yb) ions, which provided a linear cell volume decrease with the Li content increase. The increased upconversion (UC) efficiency and Raman spectroscopic properties of the phosphors were discussed in detail. The mechanism of optimization of upconversion luminescence upon Li content variation was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. The UC luminescence maximized at lithium content x = 0.05. The mechanism of UC optimization was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. Over the whole spectral range, the Raman spectra of LixNa1−xCaLa0.5(MoO4)3 doped with Er3+ and Yb3+ ions were totally superimposed with the luminescence signal of Er3+ ions, and increasing the Li+ content resulted in the difference of Er3+ multiple intensity. The density functional theory calculations with the account for the structural disorder in the system of Li, Na, Ca, La, Er and Yb ions revealed the bandgap variation from 3.99 to 4.137 eV due to the changing of Li content. It was found that the direct electronic transition energy was close to the indirect one for all compounds. The determined chromaticity points (ICP) of the LiNaCaLa(MoO4)3:Er3+,Yb3+ phosphors were in good relation to the equal-energy point in the standard CIE (Commission Internationale de L’Eclairage) coordinates.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ming, Hong, Zhao, Yifei, Zhou, Yayun, Molokeev M. S., Wang, Yuanjing, Song, Enhai, Zhang, Qinyuan
Заглавие : Chemical group substitution enables highly efficient Mn4+ luminescence in heterovalent systems
Место публикации : Adv. Optical Mater. - 2023. - Vol. 11, Is. 10. - Ст.2300076. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202300076
Примечания : Cited References: 36. - This work was financially supported by the National Key Research and Development Program of China (2022YFB3503800), the National Science Foundation of China (Grant Nos. 52202170 and 51972117). This work was also funded by RFBR according to the research project No. 19-52-80003
Аннотация: Defects are a double-edged sword for heterovalent metal-ion doping phosphors. Along with the luminescence tunability of phosphors bestowed by defects, their expected luminescence efficiency would also be inevitably lowered due to the presence of these quenching sites. Herein, a chemical group substitution strategy is proposed, where inorganic polyhedrons act as the smallest chemical units during the structural evolution of the doping process. Such a method can not only effectively prevent the defect generation for charge compensation in heterovalent doping systems, but also facilitate the incorporation of activators into the matrix, leading to extremely high luminescence efficiency. The concept is first confirmed energetically favorable by first-principles simulations. As a robust experimental proof, two newly reported Mn4+-incorporated hexavalent organic-inorganic hybrid oxyfluorides (TMA)2BO2F4:Mn4+ (where TMA stands for tetramethylammonium, and B = W6+ or Mo6+) present high quantum efficiency (up to 94.4%) and short lifetime (down to 2.26 ms) that are superior to the commercial red phosphor K2SiF6:Mn4+ (≈84.8%, ≈8.06 ms). Utilizing the differences in decay lifetimes and thermal quenching behaviors of (TMA)2BO2F4:Mn4+ and K2SiF6:Mn4+, a time- and temperature-resolved single-color multiplexing mode with high-safety and easy-access is developed for information security. This work offers an effective strategy to manipulate defect generation in luminescent materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Дмитриев Д. Д., Лексиков, Андрей Александрович, Гладышев А. Б.
Заглавие : Решая задачи импортозамещения. Результаты научной кооперации Военного учебного центра СФУ с Красноярским научным центром Сибирского отделения РАН
Колич.характеристики :5 с
Место публикации : Вестн. воен. образования. - 2023. - № 4. - С. 84-88. - ISSN 25003704 (ISSN)
Аннотация: В работе приведены результаты разработки и исследования конструкции миниатюрного полосно-пропускающего фильтра на основе многопроводниковых полосковых резонаторов. В программе электродинамического анализа спроектирован, а затем изготовлен полосно-пропускающий фильтр шестого порядка на семипроводниковых резонаторах.The paper presents the results of the development and research of the design of a miniature bandpass filter based on multiconductorstripline resonators. In the program of electrodynamic analysis, a sixth-order band-pass filter was designed and then manufactured on seven-wire resonators.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Kozak V. V., Fedorova N. A., Olshevskaya J., Kovaleva A. V., Shubin A. A., Tarasov A. S., Ovchinnikova T. M., Varnakov S. N., Tomilin F. N.
Заглавие : Substitution effect of magnetic MAX-phases (Cr4-xFex)0.5AC (A = Ge, Si, Al)
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.103
Примечания : РНФ № 21-12-00226
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorova, Natalja A., Kovaleva, Alena V., Olshevskaya Ju. S., Ivanova D. A., Kozak V. V., Shubin A. A., Tarasov A. S., Varnakov S. N., Ovchinnikov S. G., Moshkina E. M., Maximova O. A., Avramov P. V., Tomilin F. N.
Заглавие : Substitution effects in spin-polarized (Cr4-xFex)0.5AC (A = Ge, Si, Al) MAX phases
Место публикации : Magnetochemistry. - 2023. - Vol. 9, Is. 6. - Ст.147. - ISSN 23127481 (eISSN), DOI 10.3390/magnetochemistry9060147
Примечания : Cited References: 59. - This study was supported by the Russian Science Foundation, project no. 21-12-00226. P.V.A. acknowledges the support of the National Research Foundation of the Republic of Korea, grant no. NRF 2021R1A2C1010455
Аннотация: The use of spintronic devices with a tunable magnetic order on small scales is highly important for novel applications. The MAX phases containing transition metals and/or magnetic ion-substituted lattices attract a lot of attention. In this study, the magnetic and electronic properties of (Cr4-xFex)0.5AC (A = Ge, Si, Al) compounds were predicted and investigated within the density functional theory. It was established that single-substituted (Cr3Fe1)0.5AC (A = Ge, Si, Al) lattices are favorable in terms of energy. An analysis of the magnetic states of the MAX phases demonstrated that their spin order changes upon substitution of iron atoms for chromium ones. It was found that mostly the (Cr4-xFex)0.5GeC and (Cr4-xFex)0.5AlC lattices acquire a ferrimagnetic state in contrast to (Cr4-xFex)0.5SiC for which the ferromagnetic spin order dominates. It was pointed out that the atomic substitution could be an efficient way to tune the magnetic properties of proposed (Cr4-xFex)0.5AC (A = Ge, Si, Al) MAX phases.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Molokeev M. S., Eremin E. V., Bezmaternykh L. N.
Заглавие : Influence of Ga-substitution to the structural and magnetic properties of (Mn,Fe)2O3 bixbyite
Колич.характеристики :6 с
Коллективы : Nanophysics and Nanoelectronics, International Symposium
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 6. - P.1009-1014. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.06.56116.57. - ISSN 10906460 (eISSN)
Примечания : Cited References: 17. - This study was supported by grant № 21-72-00130, provided by the Russian Science Foundation (https://rscf.ru/project/21-72-00130/.)
Аннотация: To study the dependence of the properties of ternary oxides (Mn,Fe,Ga)2O3 with the bixbyite structure on the composition, the temperature dependences of the magnetization and ac magnetic susceptibility of two single-crystal samples of different compositions obtained using the flux method were analyzed. A detailed study of the structure was carried out using single-crystal X-ray diffraction analysis, and the changes in structural parameters depending on the composition were analyzed. The dc magnetization and ac magnetic susceptibility of Fe1.1Mn0.76Ga0.14O3 and Fe0.65Mn1.1Ga0.26O3 bixbyites have been studied. Despite the qualitatively similar behavior of the magnetic properties, significant differences were also found, despite a small difference in the Mn/Fe/Ga ratio in the samples under study. It is shown that both compounds experience two successive low-temperature magnetic phase transitions from the paramagnetic phase at T = 20 – 32 K as the temperature is lowered. Calculations of the Mydosh parameter for the detected phase transitions showed different degrees of ordering in the compounds under study.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Semenov S. V., Nemtsev I. V., Yakimov I. S., Balaev D. A.
Заглавие : Magnetic ion substitution and peak effect in YBCO: the strange case of Y1–xGd xBa2Cu3O7–δ
Место публикации : J. Supercond. Novel Magn. - 2022. - Vol. 35, Is. 10. - P.2679-2687. - ISSN 15571939 (ISSN), DOI 10.1007/s10948-022-06317-2
Примечания : Cited References: 50. - This work was supported by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Territory, Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project “Superconducting properties of YBCO incorporated by paramagnetic rare-earth elements” No. 20-42-240008
Аннотация: We present the results of a study of the superconducting and paramagnetic properties of polycrystalline Y1–xGdxBa2Cu3O7–δ samples. The critical current density and critical temperature of YBCO were weakly decreased by the Gd doping. A peak effect, which is a nonmonotonic dependence of the critical current density on magnetic field, was detected for all samples. The peak position shifted to higher magnetic fields with increasing Gd content. This behavior is opposite to the shift of the peak effect observed for other YBCO compounds doped by magnetic ions. This unusual behavior is apparently related to the realized granular structure instead of the type of doping ion. A correlation between the peak position and the granule size was found in the investigated samples and other polycrystalline YBCO compounds.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yang, Zhiyu, Zhao, Yifei, Zhou, Yayun, Qiao, Jianwei, Chuang, Yu-Chun, Molokeev M. S., Xia, Zhiguo
Заглавие : Giant red-shifted emission in (Sr,Ba)Y2O4:Eu2+ phosphor toward broadband near-infrared luminescence
Коллективы : International Cooperation Project of National Key Research and Development Program of China [2021YFE0105700]; National Natural Science Foundations of ChinaNational Natural Science Foundation of China (NSFC) [51972118, 51961145101]; Guangzhou Science & Technology Project [202007020005]; Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]
Место публикации : Adv. Funct. Mater. - 2022. - Vol. 32, Is. 1. - Ст.2103927. - ISSN 1616-301X, DOI 10.1002/adfm.202103927. - ISSN 1616-3028(eISSN)
Примечания : Cited References: 60. - This research was supported by the International Cooperation Project of National Key Research and Development Program of China (2021YFE0105700), National Natural Science Foundations of China (Grant No. 51972118 and 51961145101), Guangzhou Science & Technology Project (202007020005), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work is also funded by RFBR according to the research project No. 19-52-80003
Предметные рубрики: LIGHT-SOURCES
PHOTOLUMINESCENCE
TRANSITION
CE3+
BLUE
SUBSTITUTION
Аннотация: Near-infrared (NIR) light-emitting diodes (LEDs) light sources are desirable in photonic, optoelectronic, and biological applications. However, developing broadband red and NIR-emitting phosphors with good thermal stability is always a challenge. Herein, the synthesis of Eu2+-activated SrY2O4 red phosphor with high photoluminescence quantum efficiency and broad emission band ranging from 540 to 770 nm and peaking at 620 nm under 450 nm excitation is designed. Sr/Ba substitution in SrY2O4:Eu2+ has been further utilized to achieve tunable emission by modifying the local environment, which facilitates the giant red-shifted emission from 620 to 773 nm while maintaining the outstanding thermal stability of SrY2O4:Eu2+. The NIR emission is attributed to the enhanced Stokes shift and crystal field strength originated from the local structural distortions of [Y1/Eu1O6] and [Y2/Eu2O6]. The investigation in charge distribution around Y/Eu provides additional insight into increasing covalency to tune the emission toward the NIR region. As-fabricated NIR phosphor-converted LEDs demonstration shows its potential in night-vision technologies. This study reveals the NIR luminescence mechanism of Eu2+ in oxide-based hosts and provides a design principle for exploiting Eu2+-doped NIR phosphors with good thermal stability.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang S., Gai S., Zhang X., Xia M., Zhou Z., Cheng X., Yao M., Molokeev M. S., Feng Q.
Заглавие : Enhanced luminescence properties of Li2MgTiO4: Mn4+, Ge4+ phosphor via single cation substitution for indoor plant cultivation
Место публикации : Ceram. Int. - 2022. - Vol. 48. Is. 3. - P.3070-3080. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2021.10.082
Примечания : Cited References: 41. - The authors would like to gratefully acknowledge funds from National Natural Science Foundation of China (Grant No. 51974123), the Distinguished Youth Foundation of Hunan Province (Grant No. 2020JJ2018), Key R & D projects in Hunan Province (2020WK2016 & 2020SK2032), Hunan High Level Talent Gathering Project (2019RS1077 & 2020RC5007), the Natural Sciences Foundation of Hunan Agricultural University (19QN11), Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation (19KFXM12), Changsha Science and technology plan (KH2005114), and the Scientific Research Fund of Hunan Provincial Education Department (19C0903)
Аннотация: Red and far-red emitting phosphors have been widely used in phosphor-converted light emitting diode (pc-LED) devices to provide lighting for indoor plant growth, thus achieving desired product qualities. Among the many ways to optimize phosphors’ optical performance, cationic substitution is one of the most effective methods. In this study, red phosphors (Li2MgTi1-x-yO4: xMn4+, yGe4+) were synthesized by high temperature solid state method and the optical performance of phosphors were improved with increasing Ge4+ constituents. In particular, luminescence intensity of Li2MgTiO4: 0.002Mn4+, 0.1Ge4+ increased by 152% under 468 nm excitation, and the thermostability of emission intensity increases from 22% (y = 0) to 43% (y = 0.1), which is about twice as much. Finally, pc-LED device was fabricated via the red phosphor Li2MgTiO4: 0.002Mn4+,0.1Ge4+ coated on a 470 nm ultraviolet chip. By changing the proportion of the phosphor, the electroluminescence spectra of pc-LED device could match well with the absorption regions of plant pigments. Therefore, Li2MgTiO4: 0.002Mn4+, 0.1Ge4+ phosphor has potential application in plant lighting. Furthermore, this work can offer some helpful references for improving luminescent efficiency by simply modulating the chemical composition.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Draganyuk O. N., Zamkova N. G., Zhandun V. S.
Заглавие : Effect of substitution of Mn and Ga atoms by Fe atom in the Mn2GaC MAX phase
Место публикации : J. Magn. Magn. Mater. - 2022. - Vol. 563. - Ст.169860. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2022.169860
Примечания : Cited References: 40. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project № 20-42-240004: “The effect of the composition, pressure, and dimension on the magnetic, electronic, optical, and elastic properties of the magnetic M n+1 AX n (M = Cr, Mn; Fe, A = Al, Ga, Si, Ge, P, In; X = C, N; n = 1-3) MAX-phases”. The calculations were performed with the computer resources of “Complex modeling and data processing research installations of mega-class” SRC “Kurchatovsky Institute” ( http://ckp.urcki.ru ). The ternary phase diagrams for the calculation of formation enthalpies were taken from Materials Project ( https://materialsproject.org ) and OQMD ( https://oqmd.org/ ) databases
Аннотация: The magnetic properties of ordered and disordered MAX-phase Mn2-xFe2xGaC and Mn2Ga1-xFexC (x = 12.5, 25, and 50 at.%) have been studied within DFT-GGA. The investigation of phase stability of M2AX phases is performed by comparing the total energy of MAX phases to that of the set of competitive phases for calculation of the phase formation enthalpy. At the small concentration of Fe atoms (x = 12.5 %) compound remains stable. We have found that introducing Fe atom at A-site leads to the forming of ferromagnetic phase with large magnetic moments on magnetic atoms and magnetization. Through detailed group-theoretical analysis we have obtained that only ferromagnetic ordering is possible when Fe atom ordering over Ga sites. The study of exchange constants shows that the out-of-plane Fe-Mn exchange gives the main contribution in appearance of ferromagnetic phase. The temperature dependences of magnetization reveal the increase of Curie temperature in Mn2GaC with Fe atom incorporated into Ga-site.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Удод, Любовь Викторовна, Романова, Оксана Борисовна, Ситников, Максим Николаевич, Абдельбаки Х.
Заглавие : Магнитные свойства и электрическая поляризация при гетерогенном замещении в пиростаннате висмута Bi2(Sn0.9Ме0.1)2O7, Ме= Cr3+, Fe3+
Место публикации : Сиб. аэрокосм. журн. - 2022. - Т. 23, № 3. - С. 561-571. - ISSN 2712-8970, DOI 10.31772/2712-8970-2022-23-3-561-571; Sib. Aerospace J.
Примечания : Библиогр.: 37. - Работа выполнена при финансовой поддержке РФФИ, Красноярского края и Красноярского краевого фонда науки, проект No 20-42-243002
Аннотация: Пиростаннат висмута Bi2Sn2O7 является диамагнетиком и относится к структурному типу класса пирохлора А2В2О7. В этом классе соединений, при наличии магнитных ионов, проявляются очень интересные магнитные свойства. Хром- и железозамещенные пиростаннаты висмута Bi2(Sn0.9Ме0,1)2O7, Ме = Cr и Fe синтезированы методом твердофазного синтеза. Рентгеноструктурный анализ показал, что образцы соответствуют моноклинной ячейке Pc в α-фазе Bi2Sn2O7 при комнатной температуре. Изучены магнитные свойства до 1100 К в магнитных полях до 0,86 Т и электрическая поляризация на частотах 10, 3 и 1 mHz в интервале температур 80–550 К. Исследовано влияние гетерогенного замещения ионами Cr3+ и Fe3+ на магнитные свойства и электрическую поляризацию. Анализ экспериментальных данных выявил зависимость магнитных свойств от степени заполнения электронных оболочек ионов хрома и железа. Соединение Bi2(Sn0,9Cr0,1)2O7 проявляет ферромагнитные свойства, а Bi2(Sn0,9Fe0,1)2O7 – антиферромагнитные. В хромзамещенном пиростаннате висмута при α→β переходе парамагнитная температура Кюри возрастает в 3 раза. Температурная зависимость обратной магнитной восприимчивости характеризуется гистерезисом в районе температур 400–900 К. Обратная магнитная восприимчивость Bi2(Sn0,9Fe0,1)2O7 во всем температурном интервале удовлетворительно описывается законом Кюри–Вейсса. Исследования магнитных свойств установили, что ионы Fe3+ находятся в высокоспиновом состоянии. Найден гистерезис поляризации в Bi2(Sn0,9Cr0,1)2O7, который смещается по оси поляризации и зависит от температуры. Bi2(Sn1–хFeх)2O7, х = 0,1 характеризуется линейной полевой зависимостью. С увеличением концентрации ионов железа возникает гистерезис полевой зависимости электрической поляризации. Нелинейная полевая зависимость поляризации в Bi2(Sn0,8Fe0,2)2O7 объяснятся взаимодействием дипольной и миграционной поляризаций. Для соединения Bi2(Sn0,9Cr0,1)2O7 обнаружен переход в состояние дипольного стекла. В β-фазе Bi2(Sn0,8Fe0,2)2O7 выше Т = 400 К гистерезис поляризации не наблюдается и преобладает электронно-релаксационная поляризация. Механизм возникновения электронной поляризации объясняется с возникновением анионных вакансий при гетерогенном замещении ионов олова.Bismuth pyrostannate Bi2Sn2O7 is a diamagnet and belongs to the structural type of the A2B2O7 pyrochlore class. In this class of compounds, in the presence of magnetic ions, very interesting magnetic properties appear. Chromium- and iron-substituted bismuth pyrostannates Bi2(Sn0.9Me0.1)2O7, Me = Cr, and Fe were synthesized by solid-phase synthesis. X-ray diffraction analysis showed that the samples correspond to the Pc monoclinic cell of the Bi2Sn2O7 α-phase at room temperature. The magnetic properties up to 1100 K in magnetic fields up to 0.86 T and the electric polarization at frequencies of 10, 3, and 1 mHz in the temperature range 80-550 K have been studied. The effect of heterogeneous substitution by Cr3+ and Fe3+ ions on the magnetic properties and electric polarization of bismuth pyrostannate is investigated. An analysis of the experimental data revealed the dependence of the magnetic properties on the degree of filling of the electron shells of chromium and iron ions. The Bi2(Sn0.9Cr0.1)2O7 compound exhibits ferromagnetic properties, while Bi2(Sn0.9Fe0.1)2O7 exhibits antiferromagnetic properties. In chromium-substituted bismuth pyrostannate during the α→β transition, the paramagnetic Curie temperature increases by a factor of 3. The temperature dependence of the inverse magnetic susceptibility is characterized by hysteresis in the temperature range of 400-900 K. The reverse magnetic susceptibility of Bi2(Sn0.9Fe0.1)2O7 in the entire temperature range is satisfactorily described by the Curie-Weiss law. Studies of the magnetic properties have established that the Fe3+ ions are in a high-spin state. The polarization hysteresis in Bi2(Sn0.9Cr0.1)2O7 is found, which shifts along the polarization axis and depends on temperature. Bi2(Sn1-xFex)2O7, x=0.1 is characterized by a linear field dependence. With an increase in the concentration of iron ions, a hysteresis arises in the field dependence of the electric polarization. The hysteresis of polarization in Bi2(Sn0.9Cr0.1)2O7 which depends on temperature was found. The nonlinear field dependence of the polarization in Bi2(Sn0.8Fe0.2)2O7 can be explained by the interaction of the dipole and migration polarizations and the presence of oxygen vacancies. For the Bi2(Sn0.9Cr0.1)2O7 compound, a transition to the dipole glass state was found. In the β-phase of Bi2(Sn0.8Fe0.2)2O7 above T = 400 K, no polarization hysteresis is observed and the electron-relaxation polarization predominates. The mechanism of the occurrence of electronic polarization is explained with the appearance of anionic vacancies upon heterogeneous substitution of tin ions.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov, Nikolay, Pakharukova, Vera, Cherepanova, Svetlana, Yakushkin, Stanislav, Gerasimov, Evgeniy, Balaev D. A., Semenov S. V., Dubrovskii A. A., Martyanov, Oleg
Заглавие : Synthesis of Co-Ni alloy particles with the structure of a solid substitution solution by precipitation in a supercritical carbon dioxide
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 24. - Ст.4366. - ISSN 20794991 (eISSN), DOI 10.3390/nano12244366
Примечания : Cited References: 52. - This research was funded by the Russian Science Foundation, grant number № 21-73-00213 (https://rscf.ru/project/21-73-00213/ (accessed on 2 September 2020))The authors are grateful to S.V. Komogortsev and S.V. Stolyar for fruitful discussions and A.A. Krasikov for help in measurements. The magnetic measurements were performed using equipment from the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences
Аннотация: Mixed Co-Ni bimetallic systems with the structure of a solid substitution solution have been synthesized using the supercritical antisolvent precipitation (SAS) method, which uses supercritical CO2 as an antisolvent. The systems obtained have been characterized in detail using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Fourier-transform infrared (FTIR) spectroscopy, and magnetostatic measurements. It has been found that Co-enriched systems have a defective hexagonal close-packed (hcp) structure, which was described by a model which embedded cubic fragments of packaging into a hexagonal close-packed (hcp) structure. It has been shown that an increase in water content at the precipitation stage leads to a decrease in the size of cubic fragments and a more uniform distribution of them in Co-enriched systems. It has also been shown that mixed systems have the greatest coercivity in the line of samples. Ni-enriched bimetallic systems have a cubic close-packed (ccp) structure with modified crystal lattice parameters.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Horoshiy I. N., Kolkov M. I., Terent'ev K. Yu., Freydman A. L.
Заглавие : The influence of rare earth ion substitution on magnetoelectric properties in orthorombic single crystals Dy1–xHoxMnO3
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. K: Magnetic semiconductors, multiferroics, topological insulators. - Ст.K.P6. - P.318-319. - ISBN 978-5-94469-051-7
Примечания : Cited References: 2. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project number 20-42-243008
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19.

Вид документа : Статья из журнала
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Автор(ы) : Tomilin F. N., Shubin A. A., Kozak V. V., Ivanova D. A., Fedorova N. A., Ol’shevskaya Y. S., Kovaleva A. V., Avramov P. V., Ovchinnikov S. G.
Заглавие : Effect of substitution on magnetic moments of iron and chromium atoms in MAX phases of type (Cr4 – xFex)0.5SiC: Theoretical calculation
Место публикации : Phys. Met. Metallogr. - 2022. - Vol. 123, Is. 7. - P.640-644. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X22070195
Примечания : Cited References: 25. - The study is supported by the Russian Science Foundation (project no. 21-12-00226) and by the Interagency Supercomputer Center of the Russian Academy of Sciences (MVS-100K and MVS-10P)
Аннотация: MAX phases are a family of ternary layered compounds with formal stoichiometry M2AX and have a layered hexagonal structure. Calculations with the B3LYP density functional show that, by varying the ratio between the chromium and iron in the MAX phase (Cr4 – xFex)0.5SiC, it is possible to change the lattice parameters and the magnetic moment on metal atoms. In this phase, a partial substitution of one metal for the other can be considered a technique of intended variation of their magnetic properties.
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20.

Вид документа : Статья из сборника (однотомник)
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Автор(ы) : Olshevskaya J., Shubin A., Kovaleva A., Tomilin F. N.
Заглавие : The effect of iron substitution on the structure and electronic properties of Cr2SiC by theoretical method
Коллективы : International workshop on functional MAX-materials, Kirensky Institute of Physics, Siberian Federal Univercity
Место публикации : International workshop on the properties of functional MAX-materials (2nd FunMax): book of abstracts/ org. com. M. Farle [et al.]. - 2021. - P.42
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