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    Structural and magnetic properties of Fe1−xCoxSe1.09 nanoparticles obtained by thermal decomposition / O. A. Li [et al.] // Mater. Res. Express. - 2015. - Vol. 2, No. 12. - Ст. 126501, DOI 10.1088/2053-1591/2/12/126501. - Cited References: 30. - This work is supported by the Ministry of Science and Technology of Taiwan (MOST103-2811-M-153 -001 and MOST102-2112-M-153 -002 -MY3). . - ISSN 2053-1591
   Перевод заглавия: Структурные и магнитные свойства наночастиц Fe1−xCoxSe1.09, полученных тепловым разложением

РУБ Materials Science, Multidisciplinary
Рубрики:
X-RAY-DIFFRACTION
   MOSSBAUER-SPECTROSCOPY
   CRYSTAL-STRUCTURES
   IRON SELENIDES
   SUPERCONDUCTIVITY
   FeSe
   MARCASITE
   PYRITE
Кл.слова (ненормированные):
nanoparticles -- chalcogenide -- iron-cobalt selenide -- ferrimagnetism -- paramagnetism -- Mossbauer spectroscopy
Аннотация: A series of Fe1−xCoxSe1.09 (x = 0 to ) nanoparticles were synthesized by thermal decomposition method. Particles in composition range Fe0.5Co0.5Se1.09 to CoSe1.09 crystallized in monoclinic structure of Co6.8Se8 , while FeSe1.09 crystallized in hexagonal structure of FeSe achavalite. Magnetization dependences on temperature and external magnetic field reveal complicated magnetic behavior and correspond to the sum of paramagnetic and superparamagnetic response. Mössbauer spectra contain several paramagnetic doublets with parameters corresponding to nonequivalent positions of divalent and trivalent iron cations with low spin. The nonequivalent positions appeared due to inhomogeneous distribution of Co ions or metal vacancies in iron surrounding.

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Доп.точки доступа:
Li, Oksana A.; Lin, Chun-Rong; Chen, Hung-Yi; Hsu, Hua-Shu; Wu, Kai-Wun; Tseng, Yaw-Teng; Bayukov, O. A.; Баюков, Олег Артемьевич; Edelman, I. S.; Эдельман, Ирина Самсоновна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shih, Kun-Yauh
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Nuclear forward scattering application to the spiral magnetic structure study in epsilon-Fe2O3 / Y. V. Knyazev, A. I. Chumakov, A. A. Dubrovskiy [et al.] // Phys. Rev. B. - 2020. - Vol. 101, Is. 9. - Ст. 094408, DOI 10.1103/PhysRevB.101.094408. - Cited References: 44. - We thank Dr. Natalia Kazak for assistance with the NFS measurements. This study was supported by the Russian Science Foundation, Project No. 17-12-01111. We thank the European Synchrotron Radiation Facility for provision of the synchrotron radiation facilities at the beamline ID18 (Exp. No. SC-4708) . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
INCOMMENSURATE STRUCTURES
MOSSBAUER-SPECTROSCOPY
HIGH-TEMPERATURE
Аннотация: The ε−Fe2O3 magnetic structure has been analyzed using the synchrotron radiation source. Time spectra of nuclear forward scattering for isolated nanoparticles with an average size of 8 nm immobilized in a xerogel matrix have been recorded in the temperature range of 4–300K in applied magnetic fields of 0–4T in the longitudinal direction at the European Synchrotron Radiation Facility (ESRF, Grenoble, France). It has been found that the external magnetic field does not qualitatively change the Hhf(T) behavior, but makes a strong opposite impact on the hyperfine fields in the nonequivalent iron sites, leading to the divergence of Hhf polar angle dependences below 80 K. A complete diagram of the ε−Fe2O3 magnetic structure in the temperature range of 4–300K is proposed. At 300 K, the ε−Fe2O3 compound is confirmed to be a collinear ferrimagnet. The experimental results show that the magnetic transition at 150–80K leads to the formation of a noncollinear magnetic structure. Furthermore, in the range of the 80–4 K, the ground state of a magnetic spiral is established. The experimental results are supplemented by the analysis of the exchange interactions and temperature dependence of the magnetization in a magnetic field of 7 T.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50,Bldg 38, Krasnoyarsk 660036, Russia.
ESRF European Synchrotron, 71 Ave Martyrs CS40220, F-38043 Grenoble 9, France.
DESY, D-22607 Hamburg, Germany.
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Chumakov, A. I.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Sergueev, I.; Yakushkin, S. S.; Kirillov, V. L.; Martyanov, O. N.; Balaev, D. A.; Балаев, Дмитрий Александрович; Russian Science FoundationRussian Science Foundation (RSF) [17-12-01111, SC-4708]
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