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Actual composition and structure of manganese ferrite nanoparticles dispersed in the borate glass matrix / I. G. Vasilyeva [et al.] // Doklady Chemistry. - 2005. - Vol. 401, Is. 1-3. - P. 47-50, DOI 10.1007/s10631-005-0029-y . - ISSN 0012-5008
Кл.слова (ненормированные):
boric acid -- ferrite -- glass -- manganese derivative -- analytic method -- article -- chemical composition -- chemical structure -- nanoparticle -- stoichiometry -- structure analysis -- transmission electron microscopy -- X ray analysis

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Публикация на русском языке Реальный состав и структура наночастиц феррита марганца, диспергированных в матрице боратных стекол [Текст] / И. Г. Васильева [и др.] // Доклады Академии наук. - 2005. - Т. 401 № 3. - С. 349-352

Держатели документа:
Nikolaev Inst. of Inorg. Chemistry, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent'eva 3, Novosibirsk, 630090, Russian Federation
Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent'eva 5, Novosibirsk, 630090, Russian Federation
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
All-Russia Research Center, Vavilov State Optical Institute, ul. Babushkina 36/1, St. Petersburg, 192371, Russian Federation

Доп.точки доступа:
Vasilyeva, I. G.; Dovlitova, L. S.; Zaikovskii, V. I.; Malakhov, V. V.; Edel'man, I. S.; Эдельман, Ирина Самсоновна; Stepanov, A. S.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
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Effect of stoichiometry of Fe and Co on the temperature stability of the magnetic anisotropy in Pr-Dy-Fe-Co-B alloys / E. N. Kablov [et al.] // Phys. Solid State. - 2015. - Vol. 57, Is. 7. - P. 1362-1365, DOI 10.1134/S1063783415070161. - Cited References:14 . - ISSN 1063. - ISSN 1090-6460. -

РУБ Physics, Condensed Matter
Рубрики:
R2FE14B
FIELDS
Аннотация: An increase in the cobalt concentration in Pr-Dy-Fe-Co-B alloys leads to the substitution of Co atoms for Fe atoms in the atomic positions, which are the nearest neighbors with the rare-earth metal atoms, and to the formation of a significant number of boron-rich phases. At the highest (limiting) cobalt concentrations, boron can be substituted for the transition metals. As a result, the exchange interaction between magnetic sublattices of the rare-earth and transition metals is weakened. In turn, this leads to a decrease in the contribution from the rare-earth ions to the magnetic anisotropy, the temperature stability of which increases.

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Публикация на русском языке Влияние стехиометрии Fe и Со на температурную стабильность магнитной анизотропии в сплавах Pr-Dy-Fe-Co-B [Текст] / Е. Н. Каблов [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2015. - Т. 57 Вып. 7. - С. 1339-1342

Держатели документа:
All Russia Sci Res Inst Aviat Mat, Moscow 105005, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Oblast, Russia.

Доп.точки доступа:
Kablov, E. N.; Ospennikova, O. G.; Bayukov, O. A.; Баюков, Олег Артемьевич; Pletnev, O. N.; Плетнев, Олег Николаевич; Rezchikova, I. I.; Valeev, R. A.; Korolev, D. V.; Kunitsyna, E. I.; Piskorskii, V. P.; Morgunov, R. B.
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    Non-stoichiometry in Ca2Al2SiO7 enabling mixed-valent europium toward ratiometric temperature sensing / T. Hu [et al.] // Sci. China Mater. - 2019. - Vol. 62, Is. 12. - P. 1807–1814, DOI 10.1007/s40843-019-1202-x. - Cited References: 53. - This work was supported by the National Natural Science Foundation of China (51722202, 51972118 and 51572023), the Guangdong Provincial Science & Technology Project (2018A050506004), and Innovation Projects of Department of Education of Guangdong Province (2018KQNCX265). . - ISSN 2095-8226
   Перевод заглавия: Нестехиометрия в Ca2Al2SiO7, позволяющая существовать европию со смешанным валентным состоянием, для ратиометрического измерения температуры
Кл.слова (ненормированные):
temperature sensing -- phosphor -- Eu2+/Eu3+ -- intervalence charge transfer
Аннотация: Eu2+/Eu3+ mixed-valence couple co-doped material holds great potential for ratiometric temperature sensing owing to its different electronic configurations and electron-lattice interaction. Here, the correlation of nonstoichiometry in chemical composition, phase structures and luminescence propertis of Ca2Al2Si1−xO7:Eu is discussed, and controlled Eu2+/Eu3+ valence and tunable emission appear with decreasing Si content. It is found that the 2Ca2+ + Si4+ ↔ Eu2+ + Eu3+ + Al3+ cosubstitution accounts for the structural stability and charge balance mechanism. Benefiting from the diverse thermal dependent emission behaviors of Eu2+ and Eu3+, Ca2Al2Si1−xO7:Eu thermometer exhibits excellent temperature sensing performances with the maximum absolute and relative sensitivity being 0.024 K−1 (at 303 K) and 2.46% K−1 (at 443 K) and good signal discriminability. We propose that the emission quenching of Eu2+ is ascribed to 5d electrons depopulation through Eu2+/Eu3+ intervalence charge transfer state, while the quenching of Eu3+ comes from multi phonon relaxation. Our work demonstrates the potential of Ca2Al2Si1−xO7:Eu for noncontact optical thermometry, and also highlights mixed valence europium containing com pounds toward temperature sensing.

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Держатели документа:
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510641, China
School of Applied Physic and Materials, Wuyi University, Jiangmen, 529020, China
Federal Research Center KSC SB RAS, Laboratory of Crystal Physics, Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Hu, T.; Gao, Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.; Zhang, Q.
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Manifestation of stoichiometry deviation in silica-coated magnetite nanoparticles / S. V. Stolyar, R. N. Yaroslavtsev, A. V. Tyumentseva [et al.] // J. Phys. Chem. C. - 2022. - Vol. 126, Is. 17. - P. 7510-7516, DOI 10.1021/acs.jpcc.2c00349. - Cited References: 30. - This work was supported by the Russian Science Foundation and the Krasnoyarsk Region Science and Technology Support Fund, grant No. 22-14-20020. We are grateful to the Center of collective use of FRC KSC SB RAS for the provided equipment . - ISSN 1932-7447
Кл.слова (ненормированные):
High resolution transmission electron microscopy -- Magnetite nanoparticles -- Magnetization -- Nanomagnetics -- Silica -- Silicates -- Stoichiometry -- Synthesis (chemical) -- Temperature distribution
Аннотация: Iron oxide nanoparticles were synthesized by the coprecipitation method. Two varying Fe3O4/tetraethoxysilane ratios were used for silanization: 1:1.3 and 1:4.5. The samples were investigated using transmission electron microscopy, ferromagnetic resonance, IR spectroscopy, and magnetometry. Magnetic measurements have shown that the magnetite core in nanoparticles has a higher magnetization than stoichiometric magnetite nanoparticles of the same size. The increased magnetization was caused by the deviation of the magnetite stoichiometry due to the interaction with the silicate coating. The blocking temperature distribution was determined from the temperature dependence of the coercive force and from the ZFC/FC dependencies. Nanoparticles with a thicker shell have shown greater efficiency in DNA isolation.

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Держатели документа:
Krasnoyarsk Scientific Center, Federal Research Center KSC SB RAS, Akademgorodok 50, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, Bld. 38, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660049, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Yaroslavtsev, R. N.; Tyumentseva, A. V.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Tyutrina, E. S.; Saitova, A. T.; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Iskhakov, R. S.; Исхаков, Рауф Садыкович
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    The manifestation of stoichiometry deviation in silica-coated magnetite nanoparticles / S. V. Stolyar, D. A. Velikanov, A. V. Tyumentseva [et al.] // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. M : Magnetism in biology and medicine. - Ст. M.P15. - P. 451-453. - Cited References: 4. - The study was supported by the Russian Science Foundation and the Krasnoyarsk Region Science and Technology Support Fund., grant No. 22-14-20020 . - ISBN 978-5-94469-051-7
   Перевод заглавия: Проявление отклонения от стехиометрии в наночастицах магнетита, покрытых кремнезёмом

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

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Tyumentseva, A. V.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; 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"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
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