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Peculiarities of the transport and magnetic properties of the cation substituted manganese sulphides / Romanova O.B., Ryabinkina L.I. // Ninth International workshop on Non–Crystalline solids, Porto 2008, p. 60

Доп.точки доступа:
Romanova, O. B.; Романова, Оксана Борисовна; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна
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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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Crystal growth and cation order of Ni3-xCoxB2O6 oxyborates / S. Sofronova, E. Moshkina, A. Chernyshev [et al.] // CrystEngComm. - 2024, DOI 10.1039/D4CE00091A. - Cited References: 28. - The research was funded by Russian Science Foundation and Krasnoyarsk Regional Fund of Science, project № 23-12-20012 (https://rscf.ru/en/project/23-12-20012/) . - Article in press. - ISSN 1466-8033
Аннотация: A series of single crystals of Ni3-xCoxB2O6 compounds with the kotoite structure and with different concentrations of transition metal ions (x = 0; 0,19; 0,6; 0,93; 2) were obtained. The lattice parameters and atomic coordinates were determined using X-ray diffraction. The theoretical calculations using the WIEN2k package predict that nickel ions tend to occupy the 4f crystallographic position, while cobalt ions tend to occupy the 2a crystallographic positions. The study of the diffuse scattering spectra and comparison of the Racah parameters for the compounds Ni3B2O6 and Co2NiB2O6 provides experimental evidence that the nickel ions occupy crystallographic position 4f.

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Держатели документа:
Kirensky Institute of Physics of the Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences", 660036 Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, Russia

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Moshkina, E. M.; Мошкина, Евгения Михайловна; Chernyshev, A.; Чернышев, Артем Валерьевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Maximov, N.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Andryushchenko, T.; Андрющенко, Татьяна Александровна; Shabanov, A. V.; Шабанов, Александр Васильевич
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    Exprerimental and theoretical study of the cation and magnetic ordering in NixCo3-xB2O6 / S. N. Sofronova, M. S. Pavlovskii, A. Chernyshov [et al.] // Book of abstacts of Samarkand International Symposium on Magnetism (SISM-2023) / int. adv. com. S. G. Ovchinnikov [et al.]. - 2023. - Ст. 2PO-L4-21. - P. 119. - Cited References: 3. - РНФ № 23-12-20012 ; Красноярский регион. фонд науки . - ISBN 978-5-00202-320-2
   Перевод заглавия: Теоретическое и экспериментальное исследование катионного и магнитного упорядочения в NixCo3-xB2O6

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Держатели документа:
L.V. Kirensky Institute of Physics SB RAS

Доп.точки доступа:
Ovchinnikov, S. G. \int. adv. com.\; Овчинников, Сергей Геннадьевич; Sofronova, S. N.; Софронова, Светлана Николаевна; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Chernyshov, A.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Samarkand International Symposium on Magnetism(2023 ; July 2-6 ; Samarkand); Samarkand State University
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Theoretical study of the cation and magnetic ordering in NixCo3-xB2O6 / S. N. Sofronova, M. S. Pavlovsky, A. V. Chernyshov [et al.] // V International Baltic Conference on Magnetism. IBCM : Book of abstracts. - 2023. - P. 191. - Cited References: 3. - РФФИ № 23-12-20012

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Pavlovsky, M. S. (Pavlovskii M. S.); Павловский, Максим Сергеевич; Chernyshov, A. V.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; International Baltic Conference on Magnetism(5 ; 2023 ; Aug. 20-24 ; Svetlogorsk, Russia); Балтийский федеральный университет им. И. Канта
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    Enhanced luminescence properties of Li2MgTiO4: Mn4+, Ge4+ phosphor via single cation substitution for indoor plant cultivation / S. Zhang, S. Gai, X. Zhang [et al.] // Ceram. Int. - 2022. - Vol. 48. Is. 3. - P. 3070-3080, DOI 10.1016/j.ceramint.2021.10.082. - 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) . - ISSN 0272-8842
   Перевод заглавия: Улучшение люминесцентных свойств люминофора Li2MgTiO4: Mn4+, Ge4+ путем замещения одного катиона при выращивании комнатных растений
Кл.слова (ненормированные):
Mn4+ -- Titanate -- Cationic substitution -- Indoor plant cultivation
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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Держатели документа:
School of Pharmaceutical Sciences, Jishou University, Jishou, 416000, China
School of Chemistry and Materials Science, Hunan Agricultural University, Changsha, 410128, China
Hunan Provincial Engineering Technology Research Center for Optical Agriculture, Hunan Agricultural University, Changsha, 410128, China
College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China
Xiangfeng Tea Group Co. Ltd, No. 139 Tianhua North Road, Changsha, Hunan, China
Hunan Rare Earth Metal Material Research Institute Co. Ltd, No. 108 Longyuan 2nd Road, Longping High-tech Park, Changsha, Hunan, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Zhang, S.; Gai, S.; Zhang, X.; Xia, M.; Zhou, Z.; Cheng, X.; Yao, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Feng, Q.
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    Magnetic transitions in exotic perovskites stabilized by chemical and physical pressure / Y. L. Ma, M. S. Molokeev, C. H. Zhu [et al.] // J. Mater. Chem. C. - 2020. - Vol. 8, Is. 15. - P. 5082-5091, DOI 10.1039/c9tc06976c. - Cited References: 79. - This work was financially supported by the National Science Foundation of China (NSFC-21801253, 11804404 and 21875287) and the National Science Foundation (NSF) Grant No. DMR-1809931. Structural analysis of exotic materials in this study was partly supported by the Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation. The XANES work at the Brookhaven National Laboratory, NSLS-II, was supported by the DOEBES (DE-SC0012704). The NSLS-II work was performed on beamline 7-BM and the authors gratefully acknowledge the invaluable help of the beamline scientists Steven Ehrlich and Syed Khalid. . - ISSN 2050-7526. - ISSN 2050-7534
   Перевод заглавия: Магнитный переход в экзотических перовскитах, стабилизированных химическим и физическим давлением

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
COLOSSAL MAGNETORESISTANCE
   CATION ORDER
   RMN3O6 R
   T-C
   TEMPERATURE
Аннотация: Exotic perovskites significantly enrich materials for multiferroic and magnetoelectric applications. However, their design and synthesis is a challenge due to the mostly required recipe conditions at extremely high pressure. Herein, we presented the Ca2−xMnxMnTaO6 (0 ≤ x ≤ 1.0) solid solutions stabilized by chemical pressure assisted with intermediate physical pressure up to 7 GPa. The incorporation of Mn2+ into the A-site neither drives any cationic ordering nor modifies the orthorhombic Pbnm structure, namely written as (Ca1−x/2Mnx/2)(Mn1/2Ta1/2)O3 with disordered A and B site cationic arrangements. The increment of x is accompanied by a ferromagnetic to antiferromagnetic transition around x = 0.2, which is attributed to the double-exchange interactions between A-site Mn2+ and B-site Mn3+. Partial charge disproportionation of the B-site Mn3+ into Mn2+ and Mn4+ occurs for x above 0.8 samples as manifested by X-ray spectrum and magnetic behaviors. The coexistence of B-site Mn3+ (Jahn–Teller distortion ion) and B′-site Ta5+ (second-order Jahn–Teller distortion ion) could be energetically responsible for the absence of A-site columnar ordering as observed in other quadruple perovskites with half of the A-sites occupied by small transition-metal cations. These exceptional findings indicate that exotic perovskites can be successfully stabilized at chemical and intermediate physical pressure, and the presence of Jahn–Teller distortion cations at the same lattice should be avoided to enable cationic ordering.

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Держатели документа:
Sun Yat Sen Univ, Sch Chem, Minist Educ, Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Peoples R China.
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA.
Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA.

Доп.точки доступа:
Ma, Yalin; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhu, Chuanhui; Zhao, Shuang; Han, Yifeng; Wu, Meixia; Liu, Sizhan; Tyson, Trevor A.; Croft, Mark; Li, Man-Rong
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Antiferromagnetism of the cation-ordered warwickite system Mn2-xMgxBO4 (x=0.5, 0.6 and 0.7) / N. V. Kazak, N. A. Belskaya, E. M. Moshkina [et al.] // J. Magn. Magn. Mater. - 2020. - Vol. 507. - Ст. 166820, DOI 10.1016/j.jmmm.2020.166820. - Cited References: 39. - The reported study was funded by the Russian Foundation for Basic Research (no. 20-02-00559), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project. 18-42243007. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPIN-GLASS BEHAVIOR
   CRYSTAL-STRUCTURES
   SINGLE-CRYSTALS
   INSIGHTS
   MGFEBO4
Кл.слова (ненормированные):
Warwickites -- Antiferromagnet -- Cation ordering -- Jahn-Teller distortions
Аннотация: X-ray diffraction, heat capacity and magnetic measurements are performed on single crystals of Mn2-xMgxBO4 (x = 0.5, 0.6 and 0.7) with the warwickite structure. The monoclinic symmetry is found for all samples with the space group P21/n. The M1 site is occupied by trivalent Mn ions while the M2 site is occupied by a mixture of divalent Mg and Mn ions. Regular cation and charge distributions are observed, which is unusual for heterometallic warwickites. The local octahedral distortions of M1O6 show the monotonic dependence on the Mg content and are in accordance with the Jahn-Teller distortion. All samples are found to undergo long-range antiferromagnetic ordering with rather low transition temperatures of TN = 16, 14 and 13 K for x = 0.5, 0.6, and 0.7, respectively. The ordering of local octahedral distortions, caused by the strong electron-phonon interaction of the trivalent Mn ions, is proposed to stabilise the cationic ordering and, as a result, the long-range magnetic ordering in the material.

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Держатели документа:
FRC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.
RAS, Zavoisky Phys Tech Inst, FRC Kazan Sci Ctr, Kazan, Russia.
Kazan Volga Reg Fed Univ, Kazan, Russia.

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Belskaya, N. A.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Sofronova, S. N.; Софронова, Светлана Николаевна; Eremina, R. M.; Eremin, E. V.; Еремин, Евгений Владимирович; Muftakhutdinov, A. R.; Cherosov, M. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [20-02-00559]; Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science to the research project [18-42243007]
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Gavrichkov, V. A.
Cation spin and superexchange interaction in oxide materials below and above spin crossover under high pressure / V. A. Gavrichkov, S. I. Polukeev, S. G. Ovchinnikov // Phys. Rev. B. - 2020. - Vol. 101, Is. 9. - Ст. 094409, DOI 10.1103/PhysRevB.101.094409. - Cited References: 65. - We acknowledge the support of the Russian Science Foundation through Grant No. 18-12-00022 . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
EXCHANGE INTERACTION
   PHASE-TRANSITIONS
   STATE
   ELECTRON
   IRON
Аннотация: We derived simple rules for the sign of 180° superexchange interaction based on the multielectron calculations of the superexchange interaction in the transition metal oxides that are valid both below and above spin crossover under high pressure. The superexchange interaction between two cations in dn configurations is given by a sum of partial contributions related to the electron-hole virtual excitations to the different states of the dn+1 and dn−1 configurations. Using these rules, we have analyzed the sign of the 180° superexchange interaction of a number of oxides with magnetic cations in electron configurations from d2 until d8: the iron, cobalt, chromium, nickel, copper, and manganese oxides with increasing pressure. The most interesting result concerns the magnetic state of cobalt and nickel oxides CoO, Ni2O3 and also La2CoO4, LaNiO3 isostructural to well-known high-TC and colossal magnetoresistance materials. These oxides have a spin 12 at the high pressure. Change of the interaction from antiferromagnetic below spin crossover to ferromagnetic above spin crossover is predicted for oxide materials with cations in d5(FeBO3) and d7(CoO) configurations, while for materials with the other dn configurations spin crossover under high pressure does not change the sign of the 180∘ superexchange interaction.

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Держатели документа:
Kirensky Inst Phys, Akadeingorodok 50,Bld 38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; Russian Science FoundationRussian Science Foundation (RSF) [18-12-00022]
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10.

    Multi-Site Cation Control of Ultra-Broadband Near-Infrared Phosphors for Application in Light-Emitting Diodes / G. N.A.D. Guzman, V. Rajendran, Z. Bao [et al.] // Inorg. Chem. - 2020. - Vol. 59, Is. 20. - P. 15101-15110, DOI 10.1021/acs.inorgchem.0c02055. - Cited References: 26. - The authors would like to acknowledge the support of the Ministry of Science and Technology of Taiwan (Contract Nos. MOST 109-2112-M-003-011, MOST 109-2113-M-002-020-MY3, MOST 107-2113-M-002-008-MY3, MOST 107-2923-M-002-004-MY3, and MOST 106-2112-M-003-007-MY3), the National Science Center Poland Grant Opus (No. 2016/23/B/ST3/03911), and the National Center for Research and Development Poland Grant (No. PL-TW/V/1/2018). T. Lesniewski would like to acknowledge the support of the National Science Center Poland, Grant Preludium 13 (No. 2017/25/N/ST3/02412) . - ISSN 0020-1669
   Перевод заглавия: Управление катионами в нескольких позициях сверхширокополосных люминофоров ближнего инфракрасного диапазона для применения в светодиодах
Аннотация: Near-infrared (NIR) phosphors are fascinating materials that have numerous applications in diverse fields. In this study, a series of La3Ga5GeO14:Cr3+ phosphors, which was incorporated with Sn4+, Ba2+, and Sc3+, was successfully synthesized using solid-state reaction to explore every cationic site comprehensively. The crystal structures were well resolved by combining synchrotron X-ray diffraction and neutron powder diffraction through joint Rietveld refinements. The trapping of free electrons induced by charge unbalances and lattice vacancies changes the magnetic properties, which was well explained by a Dyson curve in electron paramagnetic resonance. Temperature and pressure-dependent photoluminescence spectra reveal various luminescent properties between strong and weak fields in different dopant centers. The phosphor-converted NIR light-emitting diode (pc-NIR LED) package demonstrates a superior broadband emission that covers the near-infrared (NIR) region of 650-1050 nm. This study can provide researchers with new insight into the control mechanism of multiple-cation-site phosphors and reveal a potential phosphor candidate for practical NIR LED application.

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Держатели документа:
Department of Physics, National Taiwan Normal University, Taipei, 116, Taiwan
Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, 106, Taiwan
Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
Institute for Superconducting and Electronic Materials, Faculty of Engineering, University of Wollongong, Wollongong, 2522, Australia
Institute of Experimental Physics, Faculty of Mathematic, Physics and Informatics, University of Gdansk, Wita Stwosza 57, Gdansk, 80-308, Poland
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 60041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Institute of Physics, Department of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin, al. Piastow 48, Szczecin, 70-311, Poland
Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan
Everlight Electronics Co., Ltd., New Taipei City, 238, Taiwan

Доп.точки доступа:
Guzman, G. N.A.D.; Rajendran, V.; Bao, Z.; Fang, M. -H.; Pang, W. -K.; Mahlik, S.; Lesniewski, T.; Grinberg, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Leniec, G.; Kaczmarek, S. M.; Ueda, J.; Lu, K. -M.; Hu, S. -F.; Chang, H.; Liu, R. -S.
}
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