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1.


   
    Effect of Isovalent Cation Substitution on the Thermal, Caloric, and Magnetocaloric Properties of the (La1 – yEuy)0.7Pb0.3MnO3 Manganites / A. V. Kartashev [et al.] // Phys. Solid State. - 2019. - Vol. 61, Is. 1. - P. 62-68, DOI 10.1134/S1063783419010116. - Cited References: 27. - This study was supported by the Russian Foundation for Basic Research, the Government of the Kras-noyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of the Scientific and R&D Activity, project no. 17-42-240076 “Complex Approach to Searching and Development of Promising Solid-State Ferroic Cooling Agents Based on the Single-and Multicaloric Effects.” The authors thank M.S. Molokeev for structural characterization of the composites. . - ISSN 1063-7834
Аннотация: Crystalline samples of the (La1 – yEuy)0.7Pb0.3MnO3 (y = 0, 0.2, 0.4, 0.5, 0.6, and 0.8) manganite solid solutions have been grown. Temperature dependences of the specific heat, thermal expansion, and high-intensity magnetocaloric effect have been investigated. A comparative analysis of the effect of isovalent cationic substitution on the thermal and caloric parameters of the ferromagnetic phase transition has been made. It has been shown that the growth of the Eu atom concentration leads to a decrease in the phase transition entropy and an increase in the baric coefficient dT/dp. Field and temperature dependences of the magnetocaloric effect have been established. It is demonstrated that, varying the ratio of cations, one can obtain the solid solutions with the maximum magnetocaloric effect value in fields of up to 6 kOe in a temperature range of 90–340 K. Owing to the similar reduced relative cooling powers, the investigated solid solutions can be used as reference solid-state cooling media in designing the cascade cooling systems.

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Публикация на русском языке Влияние изовалентного замещения катионов на термические, калорические и магнетокалорические свойства манганитов (La1-yEuy)0.7Pb0.3MnO3 [Текст] / А. В. Карташев [и др.] // Физ. тверд. тела. - 2019. - Т. 61 Вып. 1. - С. 200-206

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Pedagogical University, Krasnoyarsk, 660049, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Mikhashenok, N. V.; Михашенок, Наталья Владимировна
}
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2.


   
    Discovery of new narrow-band phosphors with the UCr4C4-related type structure by alkali cation effect / M. Zhao [et al.] // Adv. Opt. Mater. - 2019. - Vol. 7, Is. 6. - Ст. 1801631, DOI 10.1002/adom.201801631. - Cited References: 29. - This work was supported by the National Natural Science Foundations of China (Grant Nos. 51722202, 91622125, and 51572023) and Natural Science Foundations of Beijing (2172036). M.S.M. acknowledges the support of the Russian Foundation for Basic Research (No. 17-52-53031). . - ISSN 2195-1071
   Перевод заглавия: Открытие новых узкополосных люминофоров со структурой типа UCr4C4 с помощью замещения щелочных катионов
Кл.слова (ненормированные):
narrow-band emission -- phosphors -- photoluminescence -- substitution strategy -- white light-emitting diodes
Аннотация: Narrow-band luminescence materials used in white light-emitting diodes (WLEDs) have demonstrated a great potential to increase the maximum accessible color gamut, improve the color rendition, or enhance the visual luminous efficacy for illumination and display devices. So far, the discovery of narrow-band rare earth doped phosphors for emerging applications remains challenging owing to the limited systems in use and the broadening effect of 4f–5d transition. Here, two narrow-band cyan-emitting phosphors with the UCr4C4-related type structure, RbNa2K(Li3SiO4)4:Eu2+ (RNKLSO:Eu2+) and CsNa2K(Li3SiO4)4:Eu2+ (CNKLSO:Eu2+), are reported. The narrow-band emission results from the highly condensed network and a cube-like site for the activator (Eu2+). The emission peak assignments are investigated, and the variations of luminescence behavior with compositional changes of alkali cations are elaborated in detail. RNKLSO:8% Eu2+ (95%@250 °C of the integrated emission intensity at 25 °C) shows better thermal stability than that of CNKLSO:8% Eu2+ (79%@250 °C), which can be explained by the thermally activated crossover process represented in the configurational coordinate diagram. The optical properties of the as-fabricated WLEDs are studied and demonstrate potential with tunable properties for the full spectrum phosphor-converted LEDs. These findings in UCr4C4-type phases help shedding light on new avenues for fabricating new and totally unexpected narrow-emitting phosphors with versatile applications.

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Держатели документа:
The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, 510641, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Zhao, M.; Zhou, Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhang, Q.; Liu, Q.; Xia, Z.
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3.


   
    Eu2+ site preferences in the mixed cation K2BaCa(PO4)2 and thermally stable luminescence / J. W. Qiao [et al.] // J. Am. Chem. Soc. - 2018. - Vol. 140, Is. 30. - P. 9730-9736, DOI 10.1021/jacs.8b06021. - Cited References: 40. - This work is supported by the National Natural Science Foundation of China (No. 51722202, 91622125, 51572023, and 11574003), Natural Science Foundations of Beijing (2172036) and M.M. acknowledges support of the Russian Foundation for Basic Research (17-52-53031). . - ISSN 0002-7863
   Перевод заглавия: Предпочтительное положение ионов Eu2+ в смешанных катионах K2BaCa(PO4)2 и термически стабильная люминесценция
РУБ Chemistry, Multidisciplinary
Рубрики:
LIGHT-EMITTING-DIODES
   SOLID-SOLUTION

   PHOSPHORS

   GREEN

   BLUE

Аннотация: Site preferences of dopant Eu2+ on the locations of K+, Ba2+, and Ca2+ in the mixed cation phosphate K2BaCa(PO4)2 (KBCP) are quantitatively analyzed via a combined experimental and theoretical method to develop a blue-emitting phosphor with thermally stable luminescence. Eu2+ ions are located at K2 (M2) and K3 (M3) sites of KBCP, with the latter occupation relatively more stable than the former, corresponding to emissions at 438 and 465 nm, respectively. KBCP:Eu2+ phosphor exhibits highly thermal stable luminescence even up to 200 °C, which is interpreted as due to a balance between thermal ionization and recombination of Eu2+ 5d excited-state centers with the involvement of electrons trapped at crystal defect levels. Our results can initiate more exploration of activator site engineering in phosphors and therefore allow predictive control of photoluminescence tuning and thermally stable luminescence for emerging applications in white LEDs.

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Держатели документа:
Univ Sci & Technol Beijing, Beijing Municipal Key Lab New Energy Mat & Techno, Sch Mat Sci & Engn, Beijing 100083, Peoples R China.
Anhui Normal Univ, Dept Phys, Anhui Key Lab Optoelect Mat Sci & Technol, Wuhu 241000, Anhui, Peoples R China.
RAS, SB, KSC, Lab Crystal Phys,Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan.

Доп.точки доступа:
Qiao, Jianwei; Ning, Lixin; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chuang, Yu-Chun; Liu, Quanlin; Xia, Zhiguo
}
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4.


   
    Structural Evolution and Effect of the Neighboring Cation on the Photoluminescence of Sr(LiAl3)1−x(SiMg3)xN4:Eu2+ Phosphors / M. -H. Fang [et al.] // Angew. Chem. Int. Ed. - 2019. - Vol. 58, Is. 23. - P. 7767-7772, DOI 10.1002/anie.201903178. - Cited References: 23. - This work was supported by the Ministry of Science and Technology of Taiwan (Contract Nos. MOST 107‐2113‐M‐002‐008‐MY3 and MOST 107–2923‐M‐002‐004‐MY3). This work was supported by the National Science Centre Poland grant Opus no. 2016/23/B/ST3/03911 and the National Centre for Research and Development Poland Grant (No. PL‐TW/V/1/2018). . - ISSN 1433-7851
   Перевод заглавия: Структурные изменения и координации на фотолюминесценцию люминофоров Sr(LiAl3)1-x(SiMg3)xN4:Eu2+
Рубрики:
Solid-Solution Phosphors
Кл.слова (ненормированные):
light-emitting diodes -- nitride phosphors -- solid solutions
Аннотация: In this study, a series of Sr(LiAl3)1−x(SiMg3)xN4:Eu2+ (SLA‐SSM) phosphors were synthesized by a solid‐solution process. The emission peak maxima of SLA‐SSM range from 615 nm to 680 nm, which indicates structural differences in these materials. 7Li solid‐state NMR spectroscopy was utilized to distinguish between the Li(1)N4 and Li(2)N4 tetrahedra in SLA‐SSM. Differences in the coordination environments of the two Sr sites were found which explain the unexpected luminescent properties. Three discernible morphologies were detected by scanning electron microscopy. Temperature‐dependent photoluminescence and decay times were used to understand the diverse environments of europium ions in the two strontium sites Sr1 and Sr2, which also support the NMR analysis. Moreover, X‐ray absorption near‐edge structure studies reveal that the Eu2+ concentration in SLA‐SSM is much higher than that in in SrLiAl3N4:Eu2+ and SrSiMg3N4:Eu2+ phosphors. Finally, an overall mechanism was proposed to explain the how the change in photoluminescence is controlled by the size of the coordinated cation.

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Держатели документа:
Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
Department of Mechanical Engineering, and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, 106, Taiwan
Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Gdansk University, 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, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan

Доп.точки доступа:
Fang, M. -H.; Mahlik, S.; Lazarowska, A.; Grinberg, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Sheu, H. -S.; Lee, J. -F.; Liu, R. -S.
}
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5.


    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. - Electronic text data // ArXiv. - 2019. - Ст. 1911.06482. - Cited References: 63. - We acknowledge the support of the Russian Science Foundation through Grant 18-12-00022.
Рубрики:
Materials Science
   Strongly Correlated Electrons

Аннотация: We derived simple rules for the sign of 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 individual 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 superexchange interaction of a number of oxides with magnetic cations in electron configurations from d2 till 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 superexchange interaction.

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Держатели документа:
Kirensky Institute of Physics, Akademgorodok 50, bld.38, Krasnoyarsk, 660036 Russia

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович
}
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6.


   
    Influence of cation substitution on dielectric and electric properties of bismuth stannates Bi2Sn1.9Meo.1O7 (Me=Cr, Mn) / S. S. Aplesnin [et al.] // IOP Conf. Ser.: Mater. Sci. Eng. : IOP, 2019. - Vol. 467: 21st International Scientific Conference Reshetnev Readings 2017 (8 November 2018 through 8 November 2018) Conference code: 144163, Is. 1, DOI 10.1088/1757-899X/467/1/012014. - Cited References: 9. - This study was supported by the Russian Foundation for Basic Research project N 17-32-50080, the state order № 3.5743.2017/6.7.
Кл.слова (ненормированные):
Activation energy -- Capacitance -- Chromium -- Current voltage characteristics -- Dielectric losses -- Ions -- Manganese
Аннотация: The article studies effect of nonstoichiometric substitution of the tin ions by chromium and manganese ions on the dielectric and electrical properties of bismuth pyrostannate. The research performs measurements of the current-voltage characteristics, capacitance and tangent of the dielectric loss angle in the temperature range from 300 to 800 K; it finds a qualitative difference in the temperature behavior of the permittivity of bismuth pyrostannate with chromium and manganese ions. A change in the type of conductivity from hopping to tunneling emission is established. The change in the activation energy as a function of the ion radius is found.

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Держатели документа:
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation
Federal Research Center Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Loginov, Y. Y.; Kretinin, V. V.; Masyugin, A. N.; International Scientific Conference Reshetnev Readings 2017(21st ; 8 November 2018 ; Krasnoyarsk, Russian Federation)
}
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7.


   
    Cation Distribution in the Composite Materials of the CaFe2O4-α-Fe2O3 Series / Y. V. Knyazev [et al.] // J. Struct. Chem. - 2019. - Vol. 60, Is. 5. - P. 763-771, DOI 10.1134/S0022476619050081. - Cited References: 25. - The study was performed with the financial support of the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Krai, the Krasnoyarsk Regional Science Foundation within the project No. 18-42-243011 "The effect of the composition and the defective structure of CaFe2O4 based "core-shell" composite materials on their electronic and catalytic properties" and the UMNIK program. . - ISSN 0022-4766. - ISSN 1573-8779
РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
PD/P-TYPE CAFE2O4
   OXYGEN

   CONDUCTIVITY

Кл.слова (ненормированные):
solid-phase synthesis -- scanning electron microscopy -- Mössbauer spectroscopy -- cation vacancies
Аннотация: Structured composite materials CaFe2O4-α-Fe2O3 (α-Fe2O3 content is 2–82 wt.%) are obtained with the method of solid-phase synthesis at 1000 °C. The phase composition of the samples is studied using powder X-ray diffraction. It is shown that the content of CaFe2O4 and α-Fe2O3 phases changes linearly, depending on the composition of the starting material. The scanning electron microscopy data indicate the formation of a two-phase system α-Fe2O3-CaFe2O4. The Mössbauer spectroscopy data at room temperature testify the formation of cationic iron vacancies in the CaFe2O4 crystal structure in the absence of α-Fe2O3 structural defects. Cationic vacancies can be formed during the synthesis in the atmosphere of air.

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Публикация на русском языке Особенности катионного распределения в композиционных материалах ряда СaFe2O4—α-Fe2O3 [Текст] / Ю. В. Князев [и др.] // Журн. структ. химии. - 2019. - Т. 60 № 5. - С. 796-805

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Fed Krasnoyarsk Res Ctr, Krasnoyarsk, Russia.
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Fed Krasnoyarsk Res Ctr, Krasnoyarsk, Russia.

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Shishkina, N. N.; Bayukov, O. A.; Баюков, Олег Артемьевич; Kirik, N. P.; Solovyov, L. A.; Zhizhaev, A. M.; Rabchevsky, E. V.; Anshits, A. G.; Russian Foundation for Basic Research; Government of the Krasnoyarsk Krai; Krasnoyarsk Regional Science Foundation [18-42-243011]; UMNIK program
}
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8.


    Vasiliev, A. D.
    Structure of the oxonium compound of pefloxacinium hexachloridostannate(IV) / A. D. Vasiliev, N. N. Golovnev // J. Struct. Chem. - 2018. - Vol. 59, Is. 3. - P. 641-645, DOI 10.1134/S0022476618030198. - Cited References: 13. - The work was performed within the State Contact of the Ministry of Education of the Russian Federation and the Siberian Federal University in 2017-2019 (4.7666.2017/BCh) . - ISSN 0022-4766. - ISSN 1573-8779
РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
ANTIBACTERIAL AGENTS
   QUINOLONE

Кл.слова (ненормированные):
pefloxacinium cation -- oxonium cation -- chloride ion -- hexachloridostannate(IV) anion -- ionic compound -- crystal structure
Аннотация: The structure of tris{hexachloridostannate(IV)}-hexachloride-tetrakis(pefloxacinium)-tetraoxonium undecahydrate (CCDC 1551760) 4PefH 3 2+ , 4H3O+, 3SnCl 6 2− , 6Cl−, 11H2O (I), (PefH is pefloxacin) is determined. The I crystals are triclinic: a = 13.5474(10) Å, b = 15.2859(11) Å, c = 15.6586(11) Å, α = 94.467(1)°, β = 105.477(1)°, γ = 111.560(1)°, V = 2849.9(4) Å3, space group Pī, Z = 1. The structure is stabilized by multiple intermolecular hydrogen bonds and π–π-interactions between the PefH32+ ions.

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Публикация на русском языке

Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Fed Res Ctr KSC, Krasnoyarsk, Russia.

Доп.точки доступа:
Golovnev, N. N.; Васильев, Александр Дмитриевич; Ministry of Education of the Russian Federation [4.7666.2017/BCh]; Siberian Federal University [4.7666.2017/BCh]
}
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9.


    Belyaev, B. A.
    Impedance spectroscopy study of the electrical properties of cation-substituted barium hexaaluminate ceramics / B. A. Belyaev, N. A. Drokin, V. A. Poluboyarov // Phys. Solid State. - 2018. - Vol. 60, Is. 2. - P. 274-280, DOI 10.1134/S1063783418020063. - Cited References:18 . - ISSN 1063-7834. - ISSN 1090-6460
РУБ Physics, Condensed Matter
Рубрики:
DIELECTRIC-RELAXATION
   LIQUID-CRYSTALS

   SPECTRA

Аннотация: We report on the behavior of frequency and temperature dependences of the impedance of a measuring cell in the form of a parallel-plate capacitor filled with barium hexaaluminate ceramics with four aluminum cations replaced by iron (BaO · 2Fe2O3 · 4Al2O3). The measurements have been performed in the frequency range of 0.5–108 Hz at temperatures of 20-375°C. A technique for determining the electrical properties of the investigated ceramics is proposed, which is based on an equivalent electric circuit allowing the recorded impedance spectra to be approximated with sufficiently high accuracy. The established spectral features are indicative of the presence of two electric relaxation times different from each other by three orders of magnitude. This fact is explained by the difference between the charge transport processes in the bulk of crystallites and thin intercrystallite spacers, for which the charge activation energies have been determined.

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Публикация на русском языке Беляев, Борис Афанасьевич. Исследование электрофизических характеристик катион-замещенной керамики гексаалюмината бария методом импедансной спектроскопии [Текст] / Б. А. Беляев, Н. А. Дрокин, В. А. Полубояров // Физ. тверд. тела. - 2018. - Т. 60 Вып. 2. - С. 269–275

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr KSC SB RAS, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
Russian Acad Sci, Inst Solid State Chem & Mechanochem, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Drokin, N. A.; Дрокин, Николай Александрович; Poluboyarov, V. A.; Беляев, Борис Афанасьевич
}
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10.


   
    Effect of cation ordering on a-sites on the physical properties of substituted rare-earth cobaltite oxides GD1-XSRXCOO3-Δ / V. A. Dudnikov [et al.] // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 4PO-I-48. - P. 878

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Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Gavrilkin, S. Yu.; Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Solovyov, L. A.; Соловьев, Леонид Александрович; Vereshchagin, S. N.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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