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Phase transformations of Fe3N-Fe4N iron nitrides at pressures up to 30 GPa studied by in situ X-ray diffractometry / K. D. Litasov [et al.] // JETP Letters. - 2014. - Vol. 98, Is. 12. - P. 805-808, DOI 10.1134/S0021364013250140. - Cited References: 23. - This work was supported by the Ministry of Education and Science of the Russian Federation (project nos. 14.B37.21.1261 and 14.B25.31.0032) and, in part, by the Siberian Branch, Russian Academy of Sciences (integration project no. 97 for 2012-2014). The experiments were performed in cooperation between the Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, and Tohoku University (Global Center of Excellence program "Advanced Science and Technology Center for the Dynamic Earth"). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
EQUATION-OF-STATE
   MAGNETIC-PROPERTIES
   EPSILON-Fe3N1+X
   1ST-PRINCIPLES
   DIFFRACTION
   GAMMA-Fe4N
   TRANSITION
   Fe4N
Аннотация: The parameters of the equation of state of the stable epsilon-Fe3Nx (where x = 0.8) nitride in the Fe-N system have been determined at pressures up to 30 GPa and temperatures up to 1273 K. The parameters V-0 = 81.48(2) angstrom(3), K-T = 162(3) GPa, K-T = 4.0 = 1.66(2), gamma(0) = 555 K, and q = 1 have been determined for epsilon-Fe3N0.8 by the approximation of the P V T data with the Vinet equation of state and the thermal parameters within the formalism. No anomalous change in the volume of the cell owing to possible magnetic transitions has been revealed. The instability of Fe4N at high pressures and Fe3N in the presence of a deficit of nitrogen in the system has been established. The stable phase in the temperature range of 300-673 K and the pressure range of 20-30 GPa is epsilon-Fe3N rather than epsilon-Fe3N0.8.

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Публикация на русском языке Фазовые превращения нитридов железа Fe3N–Fe4N при давлении до 30 ГПа, исследованные методом in situ рентгеновской дифрактометрии [Текст] / К. Д. Литасов [и др.] // Письма в Журн. эксперим. и теор. физ. - 2013. - Т. 98 Вып. 11-12. - С. 907-911

Держатели документа:
Russian Acad Sci, Siberian Branch, Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia
Novosibirsk State Univ, Novosibirsk 630090, Russia
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Tohoku Univ, Grad Sch Sci, Dept Earth & Planetary Mat Sci, Sendai, Miyagi 9808578, Japan

Доп.точки доступа:
Litasov, K. D.; Shatskiy, A. F.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Popov, Z. I.; Попов, Захар Иванович; Ponomarev, D. S.; Ohtani, E.; Ministry of Education and Science of the Russian Federation [14.B37.21.1261, 14.B25.31.0032]; Siberian Branch, Russian Academy of Sciences [97]
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Theoretical study of γ′-Fe4N and ɛ-FexN iron nitrides at pressures up to 500 GPa / Z. I. Popov [et al.] // JETP Letters. - 2015. - Vol. 101, Is. 6. - P. 371-375, DOI 10.1134/S0021364015060090. - Cited References:27. - This work was supported by the Russian Science Foundation (project no. 14-17-00601), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project Nos. MD-500.2013.5 and NSh-2886.2014.2), by the Ministry of Education and Science of the Russian Federation (project no. 14.B25.31.0032), and by the Presidium of the Russian Academy of Sciences (project no. 2.16) . - ISSN 0021. - ISSN 1090-6487. -

РУБ Physics, Multidisciplinary
Рубрики:
Initio molecular-dynamics
   Augmented-wave method
   Magnetic-properties
   Transition
   ε-Fe3N1+x
   Core
   Fe4N
Аннотация: The parameters of equations of state of stoichiometric and nonstoichiometric phases of the γ′-Fe4N, ɛ-Fe3N0.75, ɛ-Fe3N, ɛ-Fe3N1.25, and ɛ-Fe3N1.5 iron nitrides in a pressure range up to 500 GPa have been determined using ab initio calculations. The points of the sharp drop and disappearance of the magnetic moment on iron atoms have been found. It has been shown that certain changes in the magnetic moment are accompanied by a change in the volume of a unit cell of the nitrides. The calculated parameters of equations of state demonstrate that the compressibility of both magnetic and nonmagnetic iron nitrides decreases monotonically with an increase in the content of nitrogen.

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Публикация на русском языке Теоретическое исследование нитридов железа γ'-Fe4N и ε-FexN при давлениях до 500 ГПа [Текст] / З. И. Попов [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 101 Вып. 5-6. - С. 405-409

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

Доп.точки доступа:
Popov, Z. I.; Попов, Захар Иванович; Litasov, K. D.; Gavryushkin, P. N.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Fedorov, A. S.; Федоров, Александр Семенович
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Theoretical study of the influence of vacancies on the electronic structure of a hexagonal boron nitride monolayer / M. V. Serzhantova [et al.] // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 4. - P. 664-667, DOI 10.1134/S1063776111030150. - Cited References: 19 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
INITIO MOLECULAR-DYNAMICS
   TRANSITION
   ALGORITHM
   METALS
   ENERGY
Кл.слова (ненормированные):
Defect type -- Divacancies -- Forbidden band -- Hexagonal boron nitride -- Inhomogeneous distribution -- Nitrogen vacancies -- Spin densities -- Theoretical study -- Vacant levels -- Boron nitride -- Defects -- Deformation -- Density functional theory -- Electronic properties -- Electronic structure -- Magnetic moments -- Monolayers -- Nitrides -- Boron
Аннотация: The influence of boron and nitrogen vacancies and divacancies on the electronic structure of a hexagonal boron nitride h-BN monolayer is studied. In the presence of vacancies in the structure, the introduced states appear in the forbidden band. The position of an introduced state with respect to the upper occupied level and the lower vacant level depends on deformation. Calculations show that, depending on the defect type and the magnitude of the applied deformation, the introduced state can be both localized and not localized on atoms surrounding the defect. When the state is localized in the system, the inhomogeneous distribution of the spin density is observed, resulting in the appearance of the magnetic moment in the system.

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Держатели документа:
[Serzhantova, M. V.
Kuzubov, A. A.] Siberian Fed Univ, Krasnoyarsk 660023, Russia
[Serzhantova, M. V.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Kuzubov, A. A.
Krasnov, P. O.] Siberian State Technol Univ, Krasnoyarsk 660049, Russia
[Kuzubov, A. A.
Fedorov, A. S.
Krasnov, P. O.
Tomilin, F. N.] Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Siberian Federal University, Krasnoyarsk 660023, Russian Federation
Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Siberian State Technological University, Krasnoyarsk 660049, Russian Federation
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Serzhantova, M. V.; Kuzubov, A. A.; Кузубов, Александр Александрович; Fedorov, A. S.; Федоров, Александр Семенович; Krasnov, P. O.; Краснов, Павел Олегович; Tomilin, F. N.; Томилин, Феликс Николаевич
}
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