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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasilyeva I. G., Dovlitova L. S., Zaikovskii V. I., Malakhov V. V., Edel'man I. S., Stepanov A. S., Aleksandrov K. S.
Заглавие : Actual composition and structure of manganese ferrite nanoparticles dispersed in the borate glass matrix
Место публикации : Doklady Chemistry. - 2005. - Vol. 401, Is. 1-3. - P.47-50. - ISSN 0012-5008, DOI 10.1007/s10631-005-0029-y
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kablov E. N., Ospennikova O. G., Bayukov O. A., Pletnev O. N., Rezchikova I. I., Valeev R. A., Korolev D. V., Kunitsyna E. I., Piskorskii V. P., Morgunov R. B.
Заглавие : Effect of stoichiometry of Fe and Co on the temperature stability of the magnetic anisotropy in Pr-Dy-Fe-Co-B alloys
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 7. - P.1362-1365. - ISSN 1063, DOI 10.1134/S1063783415070161. - ISSN 10906460(eISSN)
Примечания : Cited References:14
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hu T., Gao Y., Molokeev M. S., Xia Z., Zhang Q.
Заглавие : Non-stoichiometry in Ca2Al2SiO7 enabling mixed-valent europium toward ratiometric temperature sensing
Место публикации : Sci. China Mater. - 2019. - Vol. 62, Is. 12. - P.1807–1814. - ISSN 20958226 (ISSN), DOI 10.1007/s40843-019-1202-x
Примечания : 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).
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Yaroslavtsev R. N., Tyumentseva A. V., Komogortsev S. V., Tyutrina E. S., Saitova A. T., Gerasimova Yu. V., Velikanov D. A., Rautskii M. V., Iskhakov R. S.
Заглавие : Manifestation of stoichiometry deviation in silica-coated magnetite nanoparticles
Место публикации : J. Phys. Chem. C. - 2022. - Vol. 126, Is. 17. - P.7510-7516. - ISSN 19327447 (ISSN), DOI 10.1021/acs.jpcc.2c00349
Примечания : 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
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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Stolyar S. V., Velikanov D. A., Tyumentseva A. V., Komogortsev S. V., Yaroslavtsev R. N., Gerasimova Yu. V., Rautskii M. V., Iskhakov R. S.
Заглавие : The manifestation of stoichiometry deviation in silica-coated magnetite nanoparticles
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. M: Magnetism in biology and medicine. - Ст.M.P15. - P.451-453. - ISBN 978-5-94469-051-7
Примечания : 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
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