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Mechanism of fluorine ion diffusion in tysonite-type solid electrolytes / M. G. Izosimova [et al.] // Fiz. Tverd. Tela. - 1986. - Vol. 28, Is. 9. - P. 2644-2647. - Cited References: 20 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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Доп.точки доступа:
Izosimova, M. G.; Livshits, A. I.; Buznik, V. M.; Fedorov, P. P.; Kkrivandina, E. A.; Sobolev, B. P.
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    Low-temperature synthesis and structural properties of ferroelectric K 3WO3F3 elpasolite / V. V. Atuchin [et al.] // Chem. Phys. Lett. - 2010. - Vol. 493, Is. 1-3. - P. 83-86, DOI 10.1016/j.cplett.2010.05.023. - Cited References: 37 . - ISSN 0009-2614
Рубрики:
PEROVSKITE-LIKE OXYFLUORIDES
   CORE-LEVEL SPECTROSCOPY
   PHASE-TRANSITIONS
   SOLID-STATE
   ELECTRON-DIFFRACTION
   DIFFUSE-SCATTERING
   RHEED ANALYSIS
   POLAR
   BEHAVIOR
   (NH4)(3)TIOF5
Кл.слова (ненормированные):
Chemical synthesis -- Elpasolite -- Ferroelectric phase transition -- Fluorine atoms -- Low temperature synthesis -- Low temperatures -- Oxyfluorides -- Partial ordering -- Room temperature -- SEM -- Space Groups -- Structure parameter -- XRD -- Chemical properties -- Ferroelectric materials -- Ferroelectricity -- Fluorine -- Oxygen -- Phase transitions -- Rietveld method -- Single crystals -- Synthesis (chemical) -- X ray photoelectron spectroscopy -- X ray powder diffraction -- Scanning electron microscopy
Аннотация: Low-temperature ferroelectric G2 polymorph of K3WO 3F3 has been prepared by chemical synthesis. Structural and chemical properties of the final product have been evaluated with X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Structure parameters of G2-K 3WO3F3 are refined by the Rietveld method from XRD data measured at room temperature (space group Cm, Z = 2, a = 8.7350(3), b = 8.6808(5), c = 6.1581(3), ? = 135.124(3), V = 329.46(3) 3; RB = 2.47%). Partial ordering of oxygen and fluorine atoms has been found over anion positions. Mechanism of ferroelectric phase transition in A2BMO3F3 oxyfluorides is discussed. В© 2010 Elsevier B.V. All rights reserved.

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Держатели документа:
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russian Federation
Laboratory of Nanolithography and Nanodiagnostics, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russian Federation
Laboratory of Physical Principles for Integrated Microelectronics, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russian Federation
Laboratory of Crystal Physics, Institute of Physics, SB RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Atuchin, V. V.; Gavrilova, T. A.; Kesler, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
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Effect of cation substitution in fluorine-oxygen molybdates (NH4)(2-x) A (x) MoO2F4 / E. V. Bogdanov [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 2. - P. 303-308, DOI 10.1134/S1063783411020065. - Cited References: 11. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00062) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (project no. NSh-1011.2008.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   CRYSTALS
   (NH4)(2)WO2F4
   DIFFRACTION
   OXYFLUORIDE
   MECHANISM
   DISORDER
Аннотация: Thermophysical and structural studies of (NH4)(2 - x) A (x) MoO2F4 (A = Cs, Rb, K) solid solutions of oxyfluorides have been performed. The character of the influence of cation substitutions on the stability of the initial phase (space group Cmcm) and on the mechanism of phase transitions has been elucidated.

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Держатели документа:
[Bogdanov, E. V.
Vasil'ev, A. D.
Flerov, I. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Vasil'ev, A. D.
Flerov, I. N.] Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660074, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, ul. Kirenskogo 28, Krasnoyarsk 660074, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
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    Disorder and phase transitions in oxyfluoride (NH4)(3)Ta(O-2)(2)F-4 / I. N. Flerov [et al.] // J. Fluor. Chem. - 2011. - Vol. 132, Is. 10. - P. 713-718, DOI 10.1016/j.jfluchem.2011.05.012. - Cited Reference Count: 19. - Гранты: This work was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-4645.2010.2). - Финансирующая организация: Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-4645.2010.2] . - ISSN 0022-1139
Рубрики:
HEAT-CAPACITY
   COMPLEXES
   RB2KTIOF5
   FLUORIDES
   CRYOLITE
Кл.слова (ненормированные):
cubic oxyfluorides -- structural disorder -- phase transitions -- entropy -- permittivity -- pressure effect -- cubic oxyfluorides -- entropy -- permittivity -- phase transitions -- pressure effect -- structural disorder
Аннотация: Calorimetric, X-ray, dielectric and DTA under pressure measurements have been performed on oxyfluoride (NH4)(3)Ta(O-2)(2)F-4. The succession of nonferroelectric phase transitions was found associated with the order-disorder processes. The comparative analysis tantalate with related niobate has revealed the important role of the central atom in the physical properties behavior, mechanism of structural distortions and barocaloric effect in oxyfluorides with the eight-coordinated anionic polyhedra. (C) 2011 Elsevier By. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Siberian Dept, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
RAS, Inst Chem, Far Eastern Dept, Vladivostok 690022, Russia

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Laptash, N. M.
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Intrinsic edge asymmetry in narrow zigzag hexagonal heteroatomic nanoribbons causes their subtle uniform curvature / P. V. Avramov [et al.] // J. Phys. Chem. Lett. - 2012. - Vol. 3, Is. 15. - P. 2003-2008, DOI 10.1021/jz300625t. - Cited References: 42. - This work was supported by JAEA Research fellowship (P.V.A.). P.V.A. also acknowledges JAEA ASRC and the Molecular Spintronics Group for hospitality and fruitful collaboration. D.G.F. thanks Prof. Kazuo Kitaura for many fruitful discussions and the Next Generation SuperComputing Project, Nanoscience Program and Strategic Programs for Innovative Research (MEXT, Japan) for financial support. This work was partially supported by Russian Ministry of Education and Science (Contract No. 16.552.11.7014) (P.B.S.). . - ISSN 1948-7185

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Atomic, Molecular & Chemical + Boron nitride + Density functional theory + Electronic structure + Fluorine + Graphene + Orbital calculations + Quantum chemistry + Silicon carbide
Рубрики:
MOLECULAR-ORBITAL METHOD
   WALLED CARBON NANOTUBES
   GRAPHENE NANORIBBONS
   ELECTRONIC-STRUCTURE
   OPTICAL-TRANSITIONS
   SOLIDS
   BOND
   Aromatic rings
   Conical surfaces
   Finite length
   Fragment molecular orbital methods
   Graphene nanoribbons
   Intrinsic curvature
   Nanoribbons
   Out-of-plane
   Structural stress
Кл.слова (ненормированные):
zigzag nanoribbons -- hexagonal atomic lattices -- fluorine-terminated graphene
Аннотация: The atomic and electronic structure of narrow zigzag nanoribbons with finite length, consisting of graphene terminated by fluorine on one side, hexagonal (h) h-BN, and h-SiC were studied with density functional theory. It is found that the asymmetry of nanoribbon edges causes a uniform curvature of the ribbons due to structural stress in the aromatic ring plane. Narrow graphene nanoribbons terminated with fluorine on one side demonstrate a considerable out-of-plane bend, suggesting that the nanoribbon is a fraction of a conical surface. It is shown that the intrinsic curvature of the narrow nanoribbons destroys the periodicity and results in a systematic cancellation of the dipole moment. The in- and out- of-plane curvature of thin arcs allows their closure in nanorings or cone fragments of giant diameter. Using the fragment molecular orbital method, we optimized the structure of a planar giant arc and a closed ring of h-BN with a diameter of 105 nm.

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Держатели документа:
[Avramov, Pavel V.
Sakai, Seiji
Entani, Shiro
Ohtomo, Manabu
Matsumoto, Yoshihiro
Naramoto, Hiroshi] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan
[Avramov, Pavel V.] LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
[Fedorov, Dmitri G.] Natl Inst Adv Ind Sci & Technol, Nanosyst Res Inst, Tsukuba, Ibaraki 3058568, Japan
[Sorokin, Pavel B.] Technol Inst Superhard & Novel Carbon Mat, Troitsk 142190, Moscow Region, Russia

Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Fedorov, D. G.; Sorokin, P. B.; Sakai, S.; Entani, S.; Ohtomo, M.; Matsumoto, Y.; Naramoto, H.
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Synthesis, structural, magnetic, and electronic properties of cubic CsMnMoO3F3 oxyfluoride / V. V. Atuchin [et al.] // J. Phys. Chem. C. - 2012. - Vol. 116, Is. 18. - P. 10162-10170, DOI 10.1021/jp302020f. - Cited References: 64. - We thank Dr. A.M. Ziatdinov for the electron paramagnetic resonance measurements. This study was partly supported by SB RAS (Grant 28). . - ISSN 1932-7447

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
RAY PHOTOELECTRON-SPECTROSCOPY
   PHASE-TRANSITIONS
   CORE LEVELS
   SURFACE CHARACTERIZATION
   CRYSTAL-STRUCTURE
   CLEAVED SURFACE
   MIXED-VALENCE
   OXIDES
   MN
   MOLYBDENUM
   Chemical bondings
   Cubic phase
   Energy differences
   Heat capacity measurements
   Oxyfluorides
   Powder samples
   Solid-state synthesis
   Space Groups
   Temperature range
   Valence electron
   Binding energy
   Chemical bonds
   Electronic structure
   Fluorine compounds
   Magnetic properties
   Metal ions
   Photoelectrons
   Rietveld method
   X ray photoelectron spectroscopy
   Electronic properties
Аннотация: A powder sample of CsMnMoO3F3 oxyfluoride has been prepared by solid state synthesis. The pyrochlore-related crystal structure of CsMnMoO3F3 has been refined by the Rietveld method at T = 298 K (space group Fd-3m, a = 10.59141(4) angstrom, V = 1188.123(8) angstrom(3); R-B = 3.44%). The stability of the cubic phase has been obtained over the temperature range T = 110-293 K by heat capacity measurements. Magnetic properties have been measured over the range of T = 2-300 K. The electronic structure of CsMnMoO3F3 has been evaluated by X-ray photoelectron spectroscopy. Chemical bonding effects have been discussed for all metal ions using binding energy difference parameters and wide comparison with related oxides and fluorides. The competition between O-2(-) and F- ions for metal valence electrons has been found.

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Держатели документа:
Atuchin, Victor V.
Gavrilova, Tatyana A.
Kesler, Valery G.] SB RAS, Inst Semicond Phys, Novosibirsk 630090, Russia
Molokeev, Maxim S.
Yurkin, Gleb Yu.
Flerov, Igor N.
Patrin, Gennadii S.] SB RAS, Inst Phys, Krasnoyarsk 660036, Russia
Laptash, Natalia M.] FEB RAS, Inst Chem, Vladivostok 690022, Russia
Flerov, Igor N.
Patrin, Gennadii S.] Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Atuchin, V. V.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Yurkin, G. Yu.; Юркин, Глеб Юрьевич; Gavrilova, T. A.; Kesler, V. G.; Laptash, N. M.; Flerov, I. N.; Флёров, Игорь Николаевич; Patrin, G. S.; Патрин, Геннадий Семёнович
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Thermal properties and phase transitions in (NH4) 3ZrF7 / V. D. Fokina [et al.] // Journal of Fluorine Chemistry. - 2013. - Vol. 154. - P. 1-6, DOI 10.1016/j.jfluchem.2013.07.001 . - ISSN 0022-1139
Кл.слова (ненормированные):
Cubic fluorides -- Entropy -- Permittivity -- Phase transitions -- Pressure effect -- Thermal dilatation
Аннотация: The heat capacity, thermal dilatation, permittivity, and T-p phase diagram of (NH4)3ZrF7 have been studied in wide temperature and pressure ranges. Two phase transitions were found in addition to previously known structural transformations. The stability of crystal phases to temperature and pressure has been examined and a possibility of transition between two cubic phases has been discussed. The total excess entropy change SDSi = Rln6 is characteristic for the order-disorder processes, but its stepwise increase is not consistent with the structural model associated with the strong disorder assumed in the initial cubic phase. В© 2013 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, Siberian Dept, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
RAS, Far Eastern Dept, Inst Chem, Vladivostok 690022, Russia

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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Structure, physical properties and phase transitions in (NH4)2TiF6×NH4F / I. N. Flerov [et al.] // 17th European Symposium on Fluorine Chemistry : Abstracts book. - 2013. - P. 37

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Gorev, M. V.; Горев, Михаил Васильевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Laptash, N. M.; European Symposium on Fluorine Chemistry (17 ; 2013 ; June ; 21-25 ; Paris, France)
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Phase transitions in defect pyrochlore structure of CsFe2F6 / M. S. Molokeev [et al.] // 17th European Symposium on Fluorine Chemistry : Abstracts book. - 2013. - P. 276

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Misyul, S. V.; Мисюль, Сергей Валентинович; Tressaud, A.; Flerov, I. N.; Флёров, Игорь Николаевич; European Symposium on Fluorine Chemistry (17 ; 2013 ; June ; 21-25 ; Paris, France)
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10.

Unusual sequence of phase transitions in (NH4)3TiF7 detected by optic and calorimetric studies / S. V. Mel'nikova [et al.] // J. Fluor. Chem. - 2014. - Vol. 165. - P. 14-19, DOI 10.1016/j.jfluchem.2014.05.016. - Cited References: 13. - This work was supported by Russian Foundation for Basic Research (Grant no. 12-02-00056), and the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (Grant no. NSh-924.2014.2). . - ISSN 0022-1139. - ISSN 1873-3328

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
CRYSTAL-STRUCTURE
DIFFRACTION
NH4F
Кл.слова (ненормированные):
Cubic fluorides -- Phase transitions -- Crystal-optic -- Calorimetry
Аннотация: For the first time structural transformations were observed for one of the compounds belonging to the family of double salt fluorides A3MeF7 = A2MeF6·AF. Single crystals of (NH4)3TiF7 = (NH4)2TiF6·NH4F were grown by evaporation of the aqueous solution. Polarizing optical observations, heat capacity and birefringence Δn = (no − ne) measurements were performed in a wide temperature range 100–400 K. Two reversible, first order structural phase transitions were found to be followed by an unusual sequence of symmetry changes: cubic (G3) (T2↓ = 287.5 K; T2↑ = 291–310 K) ↔ P4/mnc (G2) (T1↓ = 358.5 K; T1↑ = 360 K) ↔ 4/m (G1). The twin structures observed were described assuming the existence of cubic parent phase G0 with P m 3 ¯ m symmetry.

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Держатели документа:
RAS, LV Kirensky Phys Inst, Siberian Dept, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, Inst Chem, Far Eastern Dept, Vladivostok 690022, Russia

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.; Russian Foundation for Basic Research [12-02-00056]; Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-924.2014.2]
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