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The iron carbides at high pressures studied by first principles calculations: Revisited / Z. I. Popov [et al.] // 3 Int. Conf. “Crystallogenesis and Mineralogy" : Abstracts. - 2013. - P. 316-317

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Доп.точки доступа:
Popov, Z. I.; Попов, Захар Иванович; Fedorov, A. S.; Федоров, Александр Семенович; Litasov, K. D.; Литасов, Константин Дмитриевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Crystallogenesis and Mineralogy, International Conference (3 ; 2013 ; 27 Sept.-1 Oct. 1 ; Novosibirsk)
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First-principles calculations of the equations of state and relative stability of iron carbides at the Earth's core pressures / K. D. Litasov [et al.] // Russ. Geol. Geophys. - 2015. - Vol. 56, Is. 1-2. - P. 164-171, DOI 10.1016/j.rgg.2015.01.010. - Cited References:50. - The study was supported by the Russian Science Foundation (grant no. 14-17-00601) and a grant for young scientists from the President of the Russian Federation (MD-500.2013.5) under a project of the Ministry of Education and Science (no. 14.B25.31.0032). The work of S.G. Ovchinnikov and Z.I. Popov was also supported by the Leading Science School program (no. NSh-2886.2014.2). . - ISSN 1068. - ISSN 1878-030X. -

РУБ Geosciences, Multidisciplinary
Рубрики:
AUGMENTED-WAVE METHOD
   Fe-C SYSTEM
   AB-INITIO
   OF-STATE
   CARBON
   MANTLE
Кл.слова (ненормированные):
iron carbide -- Earth's core -- first-principles calculations -- density -- bulk -- modulus -- magnetic moment
Аннотация: Recent experimental studies have demonstrated that Fe3C is more stable than Fe7C3 under PT-conditions of the Earth's core. Theoretical calculations at 0 K, in turn, show the possible stability of Fe2C at the core pressures. Therefore, a theoretical modeling of iron carbides at <=500 GPa is carried out. Energetically stable phases and the pressures of magnetic transitions at 0 K are determined. The parameters of magnetic transitions for Fe7C3 and Fe3C are consistent with those determined in the previous papers. The phase transition from Pnnm to Pnma in Fe2C at 28 GPa is estimated. At > 100 GPa, Fe2C loses its magnetic moment. Assuming carbon to be the only light element in the system, the first-principles calculations yield 2.7-2.9 and 2.0-2.2 wt.% C at the boundary of the inner core at 5000 and 7000 K, respectively.

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Публикация на русском языке Первопринципные расчеты уравнений состояния и относительной стабильности карбидов железа при давлениях ядра земли [Текст] / К. Д. Литасов [и др.] // Геол. и геофиз. - Новосибирск : Изд-во СО РАН, 2015. - Т. 56 № 1-2. - С. 214-223

Держатели документа:
Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Novosibirsk State Univ, Novosibirsk 630090, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Litasov, K. D.; Popov, Z. I.; Попов, Захар Иванович; Gavryushkin, P. N.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Fedorov, A. S.; Федоров, Александр Семенович; Russian Science Foundation [14-17-00601]; Russian Federation under Ministry of Education and Science [MD-500.2013.5, 14.B25.31.0032]; Leading Science School program [NSh-2886.2014.2]
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    Exchange bias in graphitic C/Co composites / H. -S. Hsu [et al.] // Carbon. - 2017. - Vol. 114. - P. 642-648, DOI 10.1016/j.carbon.2016.12.060. - Cited References: 54. - The authors would like to thank the Ministry of Science and Technology of the Republic of China, Taiwan, for financially supporting this research under Contract No. MOST 104-2112-M-153 -002 -MY3 (Hua-Shu Hsu), MOST 103-2112-M-213-004-MY3 (Hong-Ji Lin), and MOST 104-2112-M-390-001 (Shih-Jye Sun). We are thankful also to the President of Russia Program of support the leading scientific schools, grant NSh-7559,2016.2 (SGO). . - ISSN 0008-6223
   Перевод заглавия: Обменное смещение в графитовом композитном материале C/Co
Кл.слова (ненормированные):
Carbides -- Carbon -- Dichroism -- High resolution transmission electron microscopy -- Magnetoelectronics -- Transmission electron microscopy -- X ray absorption -- Electronics production -- Exchange bias effects -- Experimental evidence -- Magnetic interactions -- Potential materials -- Spintronics application -- Theoretical modeling -- X-ray magnetic circular dichroism -- Magnetic materials
Аннотация: The exchange bias (EB) effect, which is the shift of the hysteresis loop of a ferromagnet in direct contact with an antiferromagnet, is highly advantageous for the development of spintronics applications. Carbon (C) has been considered as a potential material in next generation electronics production as well as spintronics devices beyond silicon. Here we show experimental evidence for an EB in C/Co composites. The significant EB needs thermal annealing to occur. X-ray absorption spectra and transmission electron microscopy data of these samples reveal that Co carbides in as grown samples decompose and form graphitic C/Co interfaces after annealing. Using x-ray magnetic circular dichroism we have detected the C spins that are responsible for the EB. These results inspire a theoretical model to investigate the magnetic interactions in graphitic C/Co interfaces and interpret the observed results. © 2016 Elsevier Ltd

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Держатели документа:
Department of Applied Physics, National Pingtung University, 4-18, Minsheng Road, Pingtung, Taiwan
National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, Taiwan
Department of Applied Physics, National University of Kaohsiung, 700, Kaohsiung University Road, Kaohsiung, Taiwan
Kirensky Institute of Physics SB RAS, Akademgorodok 50, Bld. 38, Krasnoyarsk, Russian Federation
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation

Доп.точки доступа:
Hsu, Hua-Shu; Chang, Y.-Y.; Chin, Y.-Y.; Lin, H.-J.; Chen, C.-T.; Sun, S.-J.; Zharkov, S. M.; Жарков, Сергей Михайлович; Lin, C.-R.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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