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Multilayer composite epitaxial CuCo single crystals / E. S. Mushailov [et al.] // JETP Letters. - 2000. - Vol. 71, Is. 5. - P. 195-197, DOI 10.1134/1.568313. - Cited References: 10 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
SUPERLATTICES
DIFFRACTION
FILMS
Аннотация: The ion-plasma spraying method was used to synthesize new phases of metastable atomic-ordered layered CuCo single crystals and single crystals of CucCo1 - c solid solutions via epitaxial layer-by-layer crystallization, and some of their physical properties were studied. (C) 2000 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660049, Russia
Russian Acad Sci, Siberian Div, Inst Chem & Chem Technol, Krasnoyarsk, Russia
ИФ СО РАН
ИХХТ СО РАН

Доп.точки доступа:
Mushailov, E. S.; Kim, P. D.; Ким, Пётр Дементьевич; Turpanov, I. A.; Турпанов, Игорь Александрович; Bondarenko, G. V.; Бондаренко, Геннадий Васильевич; Bondarenko, G. N.; Бондаренко, Галина Николаевна; Mishina, S. E.
}
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Heat capacity of the PbFe1/2Ta1/2O3 perovskite-like compound / M. V. Gorev [et al.] // Phys. Solid State. - 2004. - Vol. 46, Is. 3. - P. 521-525, DOI 10.1134/1.1687872. - Cited References: 26 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SINGLE-CRYSTALS
   PBFE0.5TA0.5O3
   FERROELECTRICS
   DIFFRACTION
   NIOBATE
   GROWTH
Аннотация: The heat capacity C-p(T) of the complex perovskite PbFe1/2Ta1/2O3 has been studied using adiabatic calorimetry in the temperature range 150-370 K. Three diffuse anomalies in C-p(T) are found to exist at temperatures T-d approximate to 350 K, T-m approximate to 250-300 K, and T-c approximate to 205 K. The anomalous and the lattice contribution to the heat capacity are separated, and the change in the entropy is determined. The results of the study are discussed jointly with the data on the structure and physical properties of the compound. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
CNRS, CEMES, F-31055 Toulouse, France
INFM, I-090124 Cagliari, Italy
Dipartimento Fis, I-090124 Cagliari, Italy
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
CEMES-CNRS, 29 Rue Jeanne Marvig, Toulouse, 31055, France
Inst. Naz. di Fisica della Materia, Dipartimento di Fisica, Monserrato (Cagliari), 090124, Italy

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Sciau, P.; Lehmann, A. G.
}
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Heat capacity, structural disorder, and the phase transition in cryolite (NH4)(3)Ti(O-2)F-5 / I. N. Flerov [et al.] // Phys. Solid State. - 2006. - Vol. 48, Is. 8. - P. 1559-1567, DOI 10.1134/S1063783406080221. - Cited References: 18 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE-LIKE OXYFLUORIDES
   CRYSTAL-STRUCTURES
   (NH4)(3)TIOF5
   (NH4)(3)WO3F3
   DIFFRACTION
Аннотация: The heat capacity, T-p phase diagrams, and unit cell parameters of cryolite (NH4)(3)Ti(O-2)F-5 were studied over a wide temperature range. A phase transition was found near 226 K, and its thermodynamic characteristics and their dependence on the crystallization conditions were determined. The coordinates and thermal parameters of atoms in the Fm3m phase were refined. An analysis of the electron density distribution and the transition entropy showed that the mechanism of the structural transition involves, above all, rotation of the Ti(O-2)F-5 octahedra. Possible models of disordering of tetrahedral ammonium groups are considered.

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Bovina, A. F.; Бовина, Ася Федоровна; Laptash, N. M.
}
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Simultaneous antiferromagnetic Fe3+ and Nd3+ ordering in NdFe3((BO3)-B-11)(4) / P. . Fischer [et al.] // J. Phys.: Condens. Matter. - 2006. - Vol. 18, Is. 34. - P. 7975-7989, DOI 10.1088/0953-8984/18/34/010. - Cited References: 20 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITION
   DIFFRACTION
   CRYSTALS
   GDFE3(BO3)(4)
   SINQ
Кл.слова (ненормированные):
Iron compounds -- Magnetic moments -- Magnetization -- Neodymium compounds -- Neutron diffraction -- Vectors -- Crystal-field effects -- Free ion moment -- Specific heat measurements -- Symmetry analysis -- Antiferromagnetic materials
Аннотация: By means of magnetic susceptibility and specific heat measurements, x-ray and unpolarized neutron diffraction investigations on powder and single-crystal samples, simultaneous long-range antiferromagnetic Fe and Nd ordering in NdFe3((BO3)-B-11)(4) with R32 chemical structure has been found at temperatures below T-N = 30.5(5) K down to 1.6 K. At temperatures down to 19 K the propagation vector is k(hex) = [0, 0, 3/2] and becomes slightly incommensurate at lower temperatures. Combined with symmetry analysis, best powder neutron profile fits are obtained with magnetic spiral configurations with the magnetic moments oriented parallel to the hexagonal basal plane according to the irreducible representations tau(3) in the commensurate case. This is in agreement with the easy directions of magnetization perpendicular to the c-axis as determined by magnetic susceptibility measurements. At 1.6 K the magnetic Fe moment amounts to 4.9 mu(B) B close to the free ion moment of Fe3+. The magnetic Nd3+ moment saturates presumably due to crystal-field effects at 2.7 mu(B).

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Держатели документа:
ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, CH-5232 Villigen, Switzerland
Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
RAS, SB, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
Physik Department E21, TU Munchen, D-85748 Garching, Germany
Institute of Physics SB RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Fischer, P.; Pomjakushin, V.; Sheptyakov, D.; Keller, L.; Janoschek, M.; Roessli, B.; Schefer, J.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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Calorimetric and dielectric studies of the (NH4)(2)MoO2F4 oxyfluoride / V. D. Fokina [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 1. - P. 158-166, DOI 10.1134/S1063783410010282. - Cited References: 22. - This study was supported by the Russian Foundation for Basic Research ( project no. 09-02-00062). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   (NH4)(2)WO2F4
   DIFFRACTION
   MECHANISM
   CRYSTALS
Аннотация: The temperature dependences of the heat capacity, dielectric properties, and response to an external pressure and an electric field for the (NH4)(2)MoO2F4 oxyfluoride (space group Cmcm, Z = 4) have been studied. A comparative analysis of the data on the entropy of phase transitions, p-T phase diagrams, permittivity, and anomalous heat capacity in combination with the results of previous studies of the related compounds (NH4)(2)WO2F4 and (ND4)(2)WO2F4 has made it possible to establish that both [MO2F4](2-) anions and ammonium groups play a substantial role in the mechanism and nature of the structural transformations.

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Держатели документа:
[Fokina, V. D.
Bogdanov, E. V.
Bondarev, V. S.
Flerov, I. N.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Fokina, V. D.
Pogorel'tsev, E. I.
Bondarev, V. S.
Flerov, I. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Far Eastern Branch, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobody 79, Krasnoyarsk 660041, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogorel'tsev, E. I.; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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Nonresonant x-ray magnetic scattering on rare-earth iron borates RFe3(BO3)(4) / J. E. Hamann-Borrero [et al.] // Phys. Rev. B. - 2010. - Vol. 82, Is. 9. - Ст. 94411, DOI 10.1103/PhysRevB.82.094411. - Cited References: 38. - This work was supported by the Deustche Forschungsgemeinschaft, through the Forschergruppe FOR520 (Grant No. HE3439/6) and HASYLAB at the Feyerherm from HMI Berlin and specially to Jorg Strempfer from HASYLAB at DESY in Hamburg for valuable discussions. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
SINGLE-CRYSTALS
   CROSS-SECTION
   GDFE3(BO3)(4)
   NDFE3(BO3)(4)
   DIFFRACTION
   MNF2
Аннотация: Hard x-ray scattering experiments with a photon energy of 100 keV were performed as a function of temperature and applied magnetic field on selected compounds of the RFe3(BO3)4 family. The results show the presence of several diffraction features, in particular, nonresonant magnetic reflections in the magnetically ordered phase and structural reflections that violate the diffraction conditions for the low-temperature phase P3(1)21 of the rare-earth iron borates. The temperature and field dependence of the magnetic superlattice reflections corroborate the magnetic structures of the borate compounds obtained by neutron diffraction. The detailed analysis of the intensity and scattering cross section of the magnetic reflection reveals details of the magnetic structure of these materials such as the spin domain structure of NdFe3(BO3)(4) and GdFe3(BO3)(4). Furthermore we find that the correlation length of the magnetic domains is around 100 angstrom for all the compounds and that the Fe moments are rotated 53 degrees +/- 3 degrees off from the hexagonal basal plane in GdFe3(BO3)(4).

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Держатели документа:
[Hamann-Borrero, J. E.
Philipp, M.
Kataeva, O.
Geck, J.
Klingeler, R.
Buechner, B.
Hess, C.] IFW Dresden, Leibniz Inst Solid State & Mat Res, D-01171 Dresden, Germany
[Kataeva, O.] Russian Acad Sci, AE Arbuzov Organ & Phys Chem Inst, Kazan 420088, Russia
[Zimmermann, M. V.] Deutsch Elektronen Synchrotron DESY, Hamburger Synchrotronstrahlungslabor HASYLAB, D-22603 Hamburg, Germany
[Klingeler, R.] Univ Heidelberg, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany
[Vasiliev, A.] Moscow MV Lomonosov State Univ, Fac Phys, Low Temp Phys Dept, Moscow 119992, Russia
[Bezmaternykh, L.] Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01171 Dresden, Germany
A. E. Arbuzov Institute of Organic and Physical Chemistry, Russian Academy of Sciences, Arbuzov Str. 8, Kazan 420088, Russian Federation
Hamburger Synchrotronstrahlungslabor (HASYLAB), Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22603 Hamburg, Germany
Kirchhoff Institute for Physics, University of Heidelberg, Im Neuenheimer Feld 227, D-69120 Heidelberg, Germany
Low Temperature Physics Department, Faculty of Physics, Moscow State University, Moscow 119992, Russian Federation
L. V. Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660,0,36, Russian Federation

Доп.точки доступа:
Hamann-Borrero, J. E.; Philipp, M.; Kataeva, O.; Zimmermann, M. V.; Geck, J.; Klingeler, R.; Vasiliev, A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Buchner, B.; Hess, C.
}
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Mechanism and nature of phase transitions in the (NH4)(3)MoO3F3 oxyfluoride / I. N. Flerov [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 3. - P. 515-524, DOI 10.1134/S1063783408030219. - Cited References: 13 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
(NH4)(2)WO2F4
DIFFRACTION
CS
Аннотация: The temperature dependences of the heat capacity, the unit cell parameter, and the permittivity for the (NH4)(3)MoO3F3 cryolite (space group Fm (3) over barm) are investigated. It is revealed that the compound undergoes ferroelectric and ferroelastic structural phase transitions at temperatures of 297 and 205 K, respectively. The mechanism of structural distortions is discussed in terms of the entropy parameters, pressure-temperature phase diagrams, and electron density maps for critical atoms. An analysis is made of the influence of the cation size and shape on the phase transitions in oxyfluorides of the general formula A(2)A'MO3F3 (A,A' = NH4, K; M = Mo, W).

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Держатели документа:
[Flerov, I. N.
Fokina, V. D.
Bovina, A. F.
Bogdanov, E. V.
Molokeev, M. S.
Kocharova, A. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Pogorel'tsev, E. I.] Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660074, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kocharova, A. G.; Кочарова, Алла Георгиевна; Pogorel'tsev, E. I.; Laptash, N. M.
}
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Investigation of thermal expansion, phase diagrams, and barocaloric effect in the (NH4)(2)WO2F4 and (NH4)(2)MoO2F4 oxyfluorides / M. V. Gorev [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 1. - P. 167-175, DOI 10.1134/S1063783410010294. - Cited References: 27. - This study was performed within the framework of the Interdisciplinary Integration Project no. 34 of the Siberian Branch of the Russian Academy of Sciences and supported by the Krasnoyarsk Regional Science Foundation and the Russian Foundation for Basic Research within the framework of the project "Sibir'" ( grant no. 09-02-98001) and by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools ( project no. NSh-1011.2008.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
TRANSITIONS
   CRYSTALS
   DIFFRACTION
   MECHANISM
   PRESSURE
Аннотация: The thermal expansion along the principal crystallographic axes of the (NH4)(2)WO2F4 and (NH4)(2)MoO2F4 oxyfluorides has been studied. The anomalous behavior of alpha (i) (T) due to the phase transitions has been revealed at T (1) = 271.4 K and T (2) a parts per thousand 180 K for the molybdate and at T (1) = 201.5 K and T (2) a parts per thousand 161 K for the tungstate. The quantities dT/dp and dT/d sigma (i) , which characterize the dependence of the phase transition temperatures on the hydrostatic and uniaxial pressures, have been determined from analyzing the results of studies of the thermal expansion and heat capacity with the use of the Pippard relations. The p-T and alpha (i) -T phase diagrams reflect different characters of the influence of the pressure on the stability of the initial and distorted phases of the oxyfluorides. The magnitudes of the extensive and intensive barocaloric effects determined in the vicinity of the structural phase transitions are as follows: Delta S (BCE) varies from approximately -10 to -17 J/mol K and Delta T (AD) a parts per thousand 8-17 K for the molybdate and Delta S (BCE) varies from approximately -10 to -17 J/mol K and Delta T (AD) a parts per thousand 8-13 K for the tungstate.

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Оригинал на русском языке Исследование теплового расширения, фазовых диаграмм и барокалорического эффекта в оксифторидах (NH4)2WO2F4 и (NH4)2MoO2F4 [Текст] / М. В. Горев [и др.] // Физика твердого тела. - Санкт-Петербург : Федеральное государственное унитарное предприятие "Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Российской академии наук "Издательство "Наука", 2010. - Т. 52 № 1. - С. 156-164

Держатели документа:
[Gorev, M. V.
Bogdanov, E. V.
Flerov, I. N.
Kocharova, A. G.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Gorev, M. V.
Flerov, I. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Far Estern Branch, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobody 79, Krasnoyarsk 660041, Russian Federation
Institute of Chemistry, Far Estern Branch, Russian Academy of Sciences, ul. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Flerov, I. N.; Флёров, Игорь Николаевич; Kocharova, A. G.; Кочарова, Алла Георгиевна; Laptash, N. M.
}
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Sadreev, A. F.
Phase transitions in a system of CH3(CH2)(n-1) self-assembled on the Au(111) crystal surface / A. F. Sadreev, Y. V. Sukhinin // Phys. Rev. B. - 1996. - Vol. 54, Is. 24. - P. 17966-17973, DOI 10.1103/PhysRevB.54.17966. - Cited References: 44 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ORGANIZED MOLECULAR ASSEMBLIES
   ALKYL THIOL MONOLAYERS
   STRUCTURAL CHARACTERIZATION
   DYNAMICS SIMULATION
   DEVILS STAIRCASE
   GOLD SURFACES
   FILMS
   MODEL
   CHAIN
   DIFFRACTION
Аннотация: The n-alkanethiols CH3(CH2)(n-1) on the crystal surface of gold (111) are considered. Couplings between atoms (C, H) of the n-alkanethiols were modelled by the Morse potential, and couplings between the n-alkanethiols and the crystal surface were modelled by 12-3 potentials. Because of symmetry Z(2) of the n-alkanethiols in a tilted state, the system can be reduced to the Ising model on the triangular lattice, the phase diagram of which can be explicitly considered. Depending on the choice of the coupling parameters, the ordered state of the system may form an incommensurate or 2X1 superstructure. The temperatures of the phase transition, equilibrium tilting, twisting, and azimuthal angles are found to depend on the Morse coupling constants.

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Доп.точки доступа:
Sukhinin, Y. V.; Садреев, Алмаз Фаттахович
}
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10.

Metal-organic magnets with large coercivity and ordering temperatures up to 242°C / P. Perlepe, I. Oyarzabal, A. Mailman [et al.] // Science. - 2020. - Vol. 370, Is. 6516. - P. 587-591, DOI 10.1126/science.abb3861. - Cited References: 42. - This work was supported by the University of Bordeaux, the Region Nouvelle Aquitaine, Quantum Matter Bordeaux, and the Centre National de la Recherche Scientifique (CNRS). I.O. and R.C. are grateful to the Basque Government for I.O.'s postdoctoral grant. K.S.P. thanks the VILLUM FONDEN for a Villum Young Investigator grant (15374). A.M. thanks JYU and the Academy of Finland (project 289172) for support . - ISSN 0036-8075. - ISSN 1095-9203

РУБ Multidisciplinary Sciences
Рубрики:
ROOM-TEMPERATURE
   CHROMIUM
   FERROMAGNETISM
   DIFFRACTION
   COMPLEXES
Аннотация: Magnets derived from inorganic materials (e.g., oxides, rare-earth–based, and intermetallic compounds) are key components of modern technological applications. Despite considerable success in a broad range of applications, these inorganic magnets suffer several drawbacks, including energetically expensive fabrication, limited availability of certain constituent elements, high density, and poor scope for chemical tunability. A promising design strategy for next-generation magnets relies on the versatile coordination chemistry of abundant metal ions and inexpensive organic ligands. Following this approach, we report the general, simple, and efficient synthesis of lightweight, molecule-based magnets by postsynthetic reduction of preassembled coordination networks that incorporate chromium metal ions and pyrazine building blocks. The resulting metal-organic ferrimagnets feature critical temperatures up to 242°C and a 7500-oersted room-temperature coercivity.

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Держатели документа:
Univ Bordeaux, CNRS, Ctr Rech Paul Pascal, UMR 5031, F-33600 Pessac, France.
Univ Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France.
Univ Basque Country, UPV EHU, Chem Fac, Donostia San Sebastian 20018, Spain.
Univ Jyvaskyla, Dept Chem, FI-40014 Jyvaskyla, Finland.
ESRF European Synchrotron, CS, F-38043 Grenoble 9, France.
Swiss Norwegian Beamlines European Synchrotron Ra, F-38000 Grenoble, France.
Univ Bordeaux, CNRS, Lab Ondes & Matiere Aquitaine, F-33400 Talence, France.
Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England.
Univ Bordeaux, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France.
Tech Univ Denmark, Dept Chem, DK-2800 Lyngby, Denmark.
Kirensky Inst Phys, Fed Res Ctr KSC SB RAS, Krasnoyarsk 660036, Russia.
PSL Univ, Inst Mat Poreux Paris, UMR CNRS 8004, Ecole Normale Super, F-75005 Paris, France.

Доп.точки доступа:
Perlepe, Panagiota; Oyarzabal, Itziar; Mailman, Aaron; Yquel, Morgane; Platunov, M. S.; Платунов, Михаил Сергеевич; Dovgaliuk, Iurii; Rouzieres, Mathieu; Negrier, Philippe; Mondieig, Denise; Suturina, Elizaveta A.; Dourges, Marie-Anne; Bonhommeau, Sebastien; Musgrave, Rebecca A.; Pedersen, Kasper S.; Chernyshov, Dmitry; Wilhelm, Fabrice; Rogalev, Andrei; Mathoniere, Corine; Clerac, Rodolphe; University of Bordeaux; Region Nouvelle AquitaineRegion Nouvelle-Aquitaine; Quantum Matter Bordeaux; Centre National de la Recherche Scientifique (CNRS)Centre National de la Recherche Scientifique (CNRS); Basque GovernmentBasque Government; VILLUM FONDEN [15374]; Academy of FinlandAcademy of Finland [289172]
}
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11.

Prediction of orientation relationships and interface structures between α-, β-, γ-FeSi2 and Si phases / M. A. Visotin, I. A. Tarasov, A. S. Fedorov [et al.] // Acta Crystallogr. B. - 2020. - Vol. 76. - P. 469-482, DOI 10.1107/S2052520620005727. - Cited References: 85. - The following funding is acknowledged: Russian Science Foundation (grant No. 16-13-00060-Pi). . - ISSN 2052-5206

РУБ Chemistry, Multidisciplinary + Crystallography
Рубрики:
THERMAL-EXPANSION
   BETA-FESI2 FILMS
   GROWTH
   SILICON
   DIFFRACTION
Кл.слова (ненормированные):
interface structure -- structure prediction -- orientation relationship -- near-coincidence site -- edge-to-edge matching -- iron silicide -- DFT calculations -- thermal expansion
Аннотация: A pure crystallogeometrical approach is proposed for predicting orientation relationships, habit planes and atomic structures of the interfaces between phases, which is applicable to systems of low-symmetry phases and epitaxial thin film growth. The suggested models are verified with the example of epitaxial growth of α-, γ- and β-FeSi2 silicide thin films on silicon substrates. The density of near-coincidence sites is shown to have a decisive role in the determination of epitaxial thin film orientation and explains the superior quality of β-FeSi2 thin grown on Si(111) over Si(001) substrates despite larger lattice misfits. Ideal conjunctions for interfaces between the silicide phases are predicted and this allows for utilization of a thin buffer α-FeSi2 layer for oriented growth of β-FeSi2 nanostructures on Si(001). The thermal expansion coefficients are obtained within quasi-harmonic approximation from the DFT calculations to study the influence of temperature on the lattice strains in the derived interfaces. Faster decrease of misfits at the α-FeSi2(001)||Si(001) interface compared to γ-FeSi2(001)||Si(001) elucidates the origins of temperature-driven change of the phase growing on silicon substrates. The proposed approach guides from bulk phase unit cells to the construction of the interface atomic structures and appears to be a powerful tool for the prediction of interfaces between arbitrary phases for subsequent theoretical investigation and epitaxial film synthesis.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Visotin, M. A.; Высотин, Максим Александрович; Tarasov, I. A.; Тарасов, Иван Анатольевич; Fedorov, A. S.; Федоров, Александр Семенович; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Science FoundationRussian Science Foundation (RSF) [16-13-00060-Pi]
}
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12.

    Phase transitions and thermodynamic properties of (NH4)(3)VO2F4 cryolite / V. D. Fokina [et al.] // Solid State Sci. - 2009. - Vol. 11, Is. 4. - P. 836-840, DOI 10.1016/j.solidstatesciences.2008.11.004. - Cited Reference Count: 17. - Гранты: The authors are grateful to Dr. SM. Mel'nikova for the permission to use the unpublished results.; This work was supported by the Russian Foundation for Basic Research (project 06-02-16102). - Финансирующая организация: Russian Foundation for Basic Research [06-02-16102] . - ISSN 1293-2558
Рубрики:
PEROVSKITE-LIKE OXYFLUORIDES
   (NH4)(3)TIOF5
   CS
   (NH4)(3)WO3F3
   DIFFRACTION
   (NH4)3VO2F4
   ELPASOLITE
   METALS
   RB
Кл.слова (ненормированные):
Oxyfluorides -- Phase transition -- Calorimetry -- Phase diagram -- Ferroelectricity -- Calorimetry -- Ferroelectricity -- Oxyfluorides -- Phase diagram -- Phase transition -- Calorimetry -- Ferroelectricity -- Halide minerals -- Phase diagrams -- Sugar (sucrose) -- Thermodynamic properties -- Calorimetric measurements -- Cubic phase -- First-order phase transitions -- Heat capacities -- Oxyfluorides -- Phase transition temperatures -- Pressure dependences -- Structural transformations -- Temperature ranges -- Phase transitions
Аннотация: Calorimetric measurements performed in a wide temperature range on (NH4)(3)VO2F4 have shown the presence of four heat capacity anomalies at T-1 = 438 K, T-2 = 244 K, T-3 = 210.2 K, T-4 = 205.1 K associated with the first order phase transitions. In accordance with the permittivity behavior, the structural transformations are of nonferroelectric nature. Pressure dependence of the phase transition temperatures has been studied by DTA under pressure. The entropy of phase transitions is analyzed mainly in the framework of the orientational disordering of NH4+ and VO2F43- ions in a cubic phase. (C) 2008 Elsevier Masson SAS. All rights reserved.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Kocharova, A. G.; Кочарова, Алла Георгиевна; Flerov, I. N.; Флёров, Игорь Николаевич; Pogoreltsev, E.I.
}
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13.

Crystal structure of bismuth-containing NdFe3(BO3)4 in the temperature range 20–500 K / E. S. Smirnova, O. A. Alekseeva, A. P. Dudka [et al.] // Acta Crystallogr. B. - 2022. - Vol. 78, Pt. 1. - P. 1-13, DOI 10.1107/S205252062101180X. - Cited References: 44. - This work was performed using the equipment of the Shared Research Center FSRC `Crystallography and Photonics' RAS supported by the Russian Ministry of Science and Higher Education. This work was supported by the Ministry of Science and Higher Education within the State assignment FSRC `Crystallography and Photonics' RAS . - ISSN 2052-5206

РУБ Chemistry, Multidisciplinary + Crystallography
Рубрики:
MAGNETIC PHASE-TRANSITIONS
UNIT-CELL PARAMETERS
DIFFRACTION
Кл.слова (ненормированные):
neodymium iron borate -- multiferroic -- crystal structure -- multi-temperature -- single-crystal X-ray diffraction -- Mossbauer spectroscopy -- characteristic temperature
Аннотация: Neodymium iron borate NdFe3(BO3)4 is an intensively studied multiferroic with high electric polarization values controlled by a magnetic field. It is characterized by a large quadratic magnetoelectric effect, rigidity in the base plane and a rather strong piezoelectric effect. In this work, the atomic structure of (Nd0.91Bi0.09)Fe3(BO3)4 was studied by single-crystal X-ray diffraction in the temperature range 20–500 K (space group R32, Z = 3). The Bi atoms found in the composition partially substitute the Nd atoms in the 3a position; they entered the structure due to the growth conditions in the presence of Bi2Mo3O12. It was shown that in the temperature range 20–500 K there is no structural phase transition R32→P3121, which occurs in rare-earth iron borates (RE = Eu–Er, Y) with an effective rare-earth cation radius smaller than that of Nd. The temperature dependence of the unit-cell c parameter reveals a slight increase on cooling below 90 K, which is similar to the results obtained previously for iron borates of Gd, Y and Ho. The atomic distances (Nd,Bi)—O, (Nd,Bi)—B, (Nd,Bi)—Fe, Fe—O, Fe—B and Fe—Fe in the iron chains and between chains decrease steadily with decreasing temperature from 500 to 90 K, whereas the B1(3b)—O distance does not change and the average B2(9e)—O distance increases slightly. There is a uniform decrease in the atomic displacement parameters with decreasing temperature, with a more pronounced decrease for the Nd(3a) and O2(9e) atoms. The O2(9e) atoms are characterized by the maximum atomic displacement parameters and the most elongated atomic displacement ellipsoids. The characteristic Debye and Einstein temperatures, and the static component in the atomic displacements were determined for cations using multi-temperature diffraction data. It was shown that the Nd cations have the weakest bonds with the surrounding atoms and the B cations have the strongest.

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Держатели документа:
Russian Acad Sci, Fed Sci Res Ctr Crystallog & Photon, Shubnikov Inst Crystallog, Moscow 119333, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Smirnova, E. S.; Alekseeva, O. A.; Dudka, A. P.; Verin, I. A.; Artemov, V. V.; Lyubutina, M. V.; Gudim, I. A.; Гудим, Ирина Анатольевна; Frolov, K. V.; Lyubutin, I. S.; Russian Ministry of Science and Higher Education; Ministry of Science and Higher Education within the State assignment FSRC 'Crystallography and Photonics' RAS
}
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14.

Thermal, optical, and dielectric properties of Fluoride Rb2TaF7 / E. I. Pogorel'tsev [et al.] // Phys. Solid State. - 2017. - Vol. 59, Is. 5. - P. 986-991, DOI 10.1134/S1063783417050250. - Cited References:21. - The reported study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project no. 16-42-243001. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   X-RAY
   DISORDER
   NMR
   DIFFRACTION
   OXYFLUORIDE
Аннотация: The thermal, optical, and dielectric properties of fluoride Rb2TaF7 were investigated. It was observed that the variation in chemical pressure in fluorides A2+TaF7 caused by the cation substitution of rubidium for ammonium does not affect the ferroelastic nature of structural distortions, but leads to stabilization of the high- and low-temperature phases and enhancement of birefringence. The entropy of the phase transition P4/nmm ↔ Cmma is typical of the shift transformations, which is consistent with a model of the initial and distorted phase structures. The anisotropy of chemical pressure causes the change of signs of the anomalous strain and baric coefficient dT/dp of Rb2TaF7 as compared with the values for its ammonium analog.

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Публикация на русском языке Тепловые, оптические и диэлектрические свойства Rb2TaF7 [Текст] / Е. И. Погорельцев [и др.] // Физ. тверд. тела : Наука, 2017. - Т. 59 Вып. 5. - С. 959-964

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Krasnoyarsk State Pedag Univ, Krasnoyarsk 660060, Russia.
Russian Acad Sci, Inst Chem, Far East Branch, Vladivostok 690022, Russia.

Доп.точки доступа:
Pogorel'tsev, E. I.; Погорельцев, Евгений Ильич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Kartashev, A. V.; Карташев, Андрей Васильевич; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-243001]
}
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15.

    Influence of alkyl substituents in 1,3-diethyl-2-thiobarbituric acid on the coordination environment in M(H2O)2(1,3-diethyl-2-thiobarbiturate)2 M = Ca2+, Sr2+ / N. N. Golovnev [et al.] // J. Coord. Chem. - 2016. - Vol. 69, Is. 6. - P. 957-965, DOI 10.1080/00958972.2016.1149168. - Cited References: 42. - The study was carried out within the public task of the Ministry of Education and Science of the Russian Federation for research engineering of the Siberian Federal University in 2015-2016. V.V.A. is grateful to the Ministry of Education and Science of the Russian Federation for the financial support of the investigation. . - ISSN 0095-8972
   Перевод заглавия: Влияние алкильных заместителей в 1,3-диэтил-2-2тиобарбитуровой кислоты на координационное окружение в M(H2O)2(1,3-диэтил-2-тиобарбутурат)2 M = Ca2+, Sr2+

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
CRYSTAL-STRUCTURE
   2-THIOBARBITURIC ACID
   STRUCTURAL-CHARACTERIZATION
   THIOBARBITURIC ACID
   THERMAL-PROPERTIES
   HYDROGEN-BOND
   COMPLEXES
   DIFFRACTION
   NETWORKS
   POLYMERS
Кл.слова (ненормированные):
1,3-Diethyl-2-thiobarbituric acid -- alkaline earth metals -- coordination compound -- X-ray diffraction -- thermal analysis
Аннотация: Two new isostructural complexes, [Ca(H2O)2(μ2-Detba-O,O′)2]n (1) and [Sr(H2O)2(μ2-Detba-O,O′)2]n (2) (HDetba = 1,3-diethyl-2-thiobarbituric acid), were synthesized and characterized by single-crystal and powder X-ray diffraction analysis, TG-DSC, FT-IR, and emission spectroscopy. The single-crystal X-ray diffraction data revealed that 1 and 2 are polymeric where M2+ (M = Ca, Sr) is a six-coordinate octahedral binding four Detba− ions and two water molecules. The octahedra are linked through bridging Detba− ions forming a 2-D layer. Two intermolecular hydrogen bonds O–H…S in the crystal form a 3-D net. The comparison of M(Detba)2 and M(Htba)2 (H2tba = 2-thiobarbituric acid) structures showed that the coordination number of metals in M(Detba)2 does not exceed six and there are no π–π interactions, unlike compounds with Htba−; Detba− ions are only bridges in HDetba coordination compounds. Thermal decomposition of 1 and 2 includes dehydration, which mainly ends at 200 °C, and organic ligand oxidation at 300–350 °C with a release of CO2, SO2, H2O, NH3, and isocyanate. Upon excitation at 220 nm, 1 and 2 exhibit an intense emission maximum at 557 nm.

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Держатели документа:
Department of Chemistry, Siberian Federal University, Krasnoyarsk, Russian Federation
Laboratory of Crystal Physics, Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, Novosibirsk, Russian Federation
Functional Electronics Laboratory, Tomsk State University, Tomsk, Russian Federation
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk, Russian Federation

Доп.точки доступа:
Golovnev, N. N.; Головнёв, Николай Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Samoilo, A. S.; Atuchin, V. V.
}
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16.

    Linear Zero Thermal Expansion in a Deep-Ultraviolet Transparent Crystal of BPO4 with Cristobalite-like Structure / N. Z. Wang [et al.] // Cryst. Growth Des. - 2019. - Vol. 19, Is. 6. - P. 3109-3112, DOI 10.1021/acs.cgd.9b00361. - Cited References: 32. - This work was supported by the National Scientific Foundations of China (Grants 51872297, 51702330, 51802321 and 51890864) and Fujian Institute of Innovation (FJCXY18010201) in CAS, and the Youth Innovation Promotion Association in CAS (outstanding member for Z.L. and Grant 2017035 for X.J.). . - ISSN 1528-7483. - ISSN 1528-7505
   Перевод заглавия: Нулевое линейное тепловое расширение в прозрачном для ультрафиолетового излучения кристалле BPO4 с кристобалитоподобной структурой

РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary
Рубрики:
PHASE-TRANSITION
DIFFRACTION
QUARTZ
Аннотация: We report the discovery of the zero thermal expansion (ZTE) effect in BPO4, a famous deep-ultraviolet (DUV) optical material with cristobalite-like structure. It is revealed that BPO4 has a linear ZTE coefficient of -0.16(5) MK-1 along the c-axis as temperature increases from 13 to 300 K, which originates from the subtle counterbalance between the rotation-induced expansion and contraction effects among BO4 and PO4 groups. BPO4 is a unique DUV cristobalite-like material exhibiting the linear ZTE behavior.

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Держатели документа:
Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Cryogen, Beijing 100190, Peoples R China.
Tianjin Univ Technol, Inst Funct Crystals, Tianjin 300384, Peoples R China.
Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.

Доп.точки доступа:
Wang, Naizheng; Jiang, Xingxing; Molokeev, M. S.; Молокеев, Максим Сергеевич; Song, Gaomin; Guo, Shibin; Huang, Rongjin; Li, Laifeng; Wu, Yicheng; Lin, Zheshuai; National Scientific Foundations of China [51872297, 51702330, 51802321, 51890864]; Fujian Institute of Innovation [FJCXY18010201]; Youth Innovation Promotion Association in CAS [2017035]
}
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17.

Magnetic, dielectric, and transport properties of bismuth pyrostannate Bi2(Sn0.9Mn0.1)2O7 / S. S. Aplesnin [et al.] // Phys. Solid State. - 2017. - Vol. 59, Is. 11. - P. 2268-2273, DOI 10.1134/S1063783417110038. - Cited References:20. - This work was supported by the Russian Foundation for Basic Researchers, the Government of the Krasnoyarsk Region, the Krasnoyarsk regional Foundation for Support of Scientific and Scientific-Engineering activity in the framework of the scientific projects no. 18-52-00045 Bel_a. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
BI2SN2O7
POLYMORPHISM
DIFFRACTION
Аннотация: The effect of replacing manganese ions on the structural, dielectric, transport, and magnetic properties of Bi2(Sn0.9Mn0.1)2O7 has been studied and the correlation between them has been determined. The change in the type of thermal processes and the thermopower sign upon polymorphous transitions were detected by differential scanning calorimetry. The paramagnetic Curie temperature and the antiferromagnetic interaction were determined in the martensite and austenite phases. The type of current carriers has been established.

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Публикация на русском языке Магнитные, диэлектрические и транспортные свойства пиростанната висмута BI2(SN0.9MN0.1)2O7 [Текст] / С. С. Аплеснин [и др.] // Физ. тверд. тела. - 2017. - Т. 59 Вып. 11. - С. 2246-2251

Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Fed Sci Ctr, Kirensky Inst Phys,Siberian Branch, Akademgorod 50, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Aerosp Univ, Ul Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660014, Russia.
Russian Acad Sci, Krasnoyarsk Sci Ctr, Fed Sci Ctr, Siberian Branch, Akademgorod 50, Krasnoyarsk 660036, Russia.
Natl Acad Sci Belarus, Sci & Pract Mat Res Ctr, Ul P Brovki 19, BY-220072 Minsk, Byelarus.

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Sitnikov, M. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Tarasova, L. S.; Yanushkevich, K. I.; Russian Foundation for Basic Researchers; Government of the Krasnoyarsk Region; Krasnoyarsk regional Foundation for Support of Scientific and Scientific-Engineering activity [18-52-00045 Bel_a]
}
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18.

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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19.

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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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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20.

Studies of the heat capacity and thermal expansion of the Na0.95K0.05NbO3 solid solution / M. V. Gorev [et al.] // Phys. Solid State. - 2014. - Vol. 56, Is. 2. - P. 367-372, DOI 10.1134/S1063783414020115. - Cited References: 27. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2) and the Russian Foundation for Basic Research (project no. 12-02-31799 mol_a). . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
SODIUM NIOBATE
   PHASE-TRANSITIONS
   TEMPERATURE-RANGE
   SINGLE-CRYSTALS
   KNBO3
   FERROELECTRICS
   DIFFRACTION
   OCTAHEDRA
Аннотация: The heat capacity and thermal expansion of ceramic samples of the Na0.95K0.05NbO3 solid solution have been investigated over a wide temperature range of 100-750 K. The observed anomalies in the heat capacity and thermal expansion at T (4) = 297 K, T (3) = 535 K, T (2) = 665 K, and T (1) a parts per thousand 710 K correspond to the sequences of phase transitions N - Q - G - S - T1. It has been shown that, as a result of the phase transitions, the unit cell volume at T (4) and T (2) decreases, and at T (3) and T (1), increases with increasing temperature. The directions of the shift of the phase transition temperatures induced by hydrostatic pressure have been determined. It has been established that all structural transformations are accompanied by relatively small variations in the entropy. Different mechanisms of the structural distortions have been discussed.

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Публикация на русском языке Исследования теплоемкости и теплового расширения твердого раствора Na0.95K0.05NbO3 [Текст] / М. В. Горев [и др.] // Физ. тверд. тела. - 2014. - Т. 56 Вып. 2. - С. 362-367

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia
Southern Fed Univ, Inst Phys Res, Rostov Na Donu 344090, Russia

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Raevskaya, S. I.; Ivliev, M. P.; Raevskii, I. P.; Flerov, I. N.; Флёров, Игорь Николаевич; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation [NSh-4828.2012.2]; Russian Foundation for Basic Research [12-02-31799 mol_a]
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