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1.
Ferroelastic phase transition
in Cs3Bi2I9: A neutron diffraction study / A. . Jorio [et al.]> // Phys. Rev. B. - 2000. -
Vol. 61
,
Is. 6
. - P. 3857-3862,
DOI
10.1103/PhysRevB.61.3857. - Cited References: 16 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
CRYSTAL
SCATTERING
CS3SB2I9
Аннотация:
Crystalline Cs3Bi2I9, With the P6(3)/mmc symmetry at room temperature was studied by Laue and four-circle neutron diffractometry from room temperature down to 50 K. At T-0 = 220 K the
crystal
undergoes a second-order proper ferroelastic phase transition to a polydomain structure with a nonprimitive monoclinic C12/m1 space group. Satellites were not found below T-0, indicating that the continuous distribution of sites observed in previous I-127 nuclear quadrupole resonance experiments is due either to an undetected incommensurate phase characterized by a very small displacement amplitude, or due to the fraction of the
crystal
volume occupied by domain walls. We argue that thick domain walls are expected in the present structure due to the absence of mechanical compatibility between domains.
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Держатели документа:
Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Ecole Cent Paris, LSPMM, CNRS, UMR 8580, F-92295 Chatenay Malabry, France
CENS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France
Univ Toulon & Var, LMMI, F-83957 La Garde, France
ИФ СО РАН
Доп.точки доступа:
Jorio, A.; Currat, R.; Myles, DAA; McIntyre, G. J.; Aleksandrova, I. P.; Александрова, Инга Петровна; Kiat, J. M.; Saint-Gregoire, P.
}
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2.
Magnetic phase transitions
in the double spin-chains compound LiCu2O2 / B. . Roessli [et al.]> // Physica B. - 2001. -
Vol. 296
,
Is. 4
. - P. 306-311,
DOI
10.1016/S0921-4526(00)00574-3. - Cited References: 17 . - ISSN 0921-4526
РУБ
Physics, Condensed Matter
Рубрики:
ORDERED MOMENT
COPPER
CRYSTAL
LI2CUO2
Кл.слова (ненормированные):
muon-spin rotation
--
spin ladder
--
magnetic ordering
--
LiCu2O2
--
Crystal
structure
--
Lithium compounds
--
Magnetic anisotropy
--
Magnetic field effects
--
Magnetic relaxation
--
Magnetization
--
Order disorder transitions
--
Specific heat of solids
--
X ray diffraction analysis
--
Anisotropic line broadening
--
Muon spin rotation
--
Spin ladder
--
Antiferromagnetic materials
Аннотация:
We report high-resolution X-ray diffraction, muon-spin-rotation spectroscopic and specific heat measurements in the double spin-chains compound LiCu2O2. The X-ray diffraction results show that the
crystal
structure of LiCu2O2 is orthorhombic down to T = 10 K. Anisotropic line-broadening of the diffraction peaks is observed, indicating disorder along the spin chains. Muon-spin relaxation and specific heat measurements show that LiCu2O2 undergoes a phase transition to a magnetic ordered state at T-1 similar to 24 K. The specific heat data exhibits a second lambda -like peak at T-2 similar to 32.5 K, which increases with increasing magnetic field in a similar way to that found in spin-ladder compounds. (C) 2001 Elsevier Science B.V. All rights reserved.
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Держатели документа:
Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
ETH Zurich, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland
Univ Lausanne, Inst Crystallog, CH-1015 Lausanne, Switzerland
RAS, SB, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Laboratory for Neutron Scattering, Paul Scherrer Inst. and ETH Zurich, CH-5232 Villigen PSI, Switzerland
Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Lab. for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Institut de Crystallographie, Universite de Lausanne, CH-1015 Lausanne, Switzerland
Institute of Physics SB RAS, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Roessli, B.; Staub, U.; Amato, A.; Herlach, D.; Pattison, P.; Sablina, K. A.; Саблина, Клара Александровна; Petrakovskii, G. A.; Петраковский, Герман Антонович
}
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3.
Zobov, V. E.
Second moment of multiple-quantum NMR and a time-dependent growth of the number of multispin correlations in solids / V. E. Zobov, A. A. Lundin> // J. Exp. Theor. Phys. - 2006. -
Vol. 103
,
Is. 6
. - P. 904-916,
DOI
10.1134/S1063776106120089. - Cited References: 39 . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
NUCLEAR-MAGNETIC-RESONANCE
LINE-SHAPE
SPIN SYSTEMS
DYNAMICS
SPECTRA
COHERENCES
STATE
BEHAVIOR
CRYSTAL
MODEL
Кл.слова (ненормированные):
Correlation methods
--
Mathematical models
--
Nuclear magnetic resonance spectroscopy
--
Spectrum analysis
--
Time series analysis
--
Four-spin time correlation
--
Multispin correlations
--
Second moment
--
Time power series
--
Quantum theory
Аннотация:
The time evolution of multispin correlations (the growth of the number of correlated spins as a function of time) can be observed directly using the multiple-quantum nuclear magnetic resonance spectroscopy of solids. A quantity related to this number, namely, the second moment
of the intensity distribution of coherences of different orders in the multiple-quantum spectrum can be calculated using the theory proposed in this work. An approach to the calculation of the four-spin time correlation function through which this moment is expressed is developed. The main sequences of contributions in the expansion of this function into a time power series are summed using the approximation of a large number of neighbors both for systems with a secular dipole-dipole interaction and for systems with a nonsecular effective interaction. An exponential dependence of
is obtained. The value of
is additionally calculated using an expansion in terms of orthogonal operators for three model examples corresponding to different limiting realizations of spin systems. It is shown that the results of the microscopic theory at least qualitatively agree with both the results obtained for model examples and experimental results obtained recently for adamantane.
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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Russian Acad Sci, Semenov Inst Chem Phys, Moscow 117977, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 117977, Russian Federation
Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
}
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4.
Zinenko, V. I.
Lattice dynamics of BiFeO3 under hydrostatic pressure / V. I. Zinenko, M. S. Pavlovskii> // Phys. Solid State. - 2009. -
Vol. 51
: 18th All-Russia Conference on Physics of Ferroelectrics (VKS-XVIII) (JUN 09-14, 2008, St Petersburg, RUSSIA),
Is. 7
. - P. 1404-1408,
DOI
10.1134/S1063783409070208. - Cited References: 10 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
CRYSTAL
Аннотация:
The vibrational frequencies of the BiFeO3
crystal
lattice in the cubic phase (Pm3m) and the rhombohedral paraelectric phase (R3c) are calculated in terms of the ab initio model of an ionic
crystal
with the inclusion of the dipole and quadrupole polarizabilities. In the ferroelectric phase with the symmetry R3c, the calculated spontaneous polarization of 136 mu C cm(-2) agrees well with the experimental data. The dependences of the unit cell volume, the elastic modulus, and the vibrational frequencies on the pressure are calculated. It is found that the frequency of an unstable ferroelectric mode in both the cubic (Pm3m) and rhombohedral (R3c) phases are almost independent of the applied pressure, in contrast to classical ferroelectrics with a perovskite structure, where the ferroelectric instability is very sensitive to a variation in the pressure.
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Держатели документа:
[Zinenko, V. I.
Pavlovskii, M. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Pavlovskii, M. S.; Павловский, Максим Сергеевич; Зиненко, Виктор Иванович
}
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5.
Search for and
study of phase transitions in some representatives of the APb(2)X(5) family / S. V. Mel'nikova [et al.]> // Phys. Solid State. - 2006. -
Vol. 48
,
Is. 11
. - P. 2152-2156,
DOI
10.1134/S1063783406110217. - Cited References: 5 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
CRYSTAL
Аннотация:
Single crystals of KPb2Cl5, RbPb2Cl5, and RbPb2Br5 are grown and studied using optical polarization methods. The heat capacity of the crystals is investigated by differential scanning microcalorimetry, and the birefringence and the angle of rotation of the optical indicatrix are measured. The measurements are performed in the temperature range 270-640K. It is found that KPb2Cl5 undergoes a first-order ferroelastic phase transition at T-0 up arrow=530K, T-0 down arrow=528K, and Delta H=1000 +/- 200 J/mol. The transition is accompanied by twinning and a change in symmetry mmm reversible arrow P2(1)/c. The RbPb2Cl5
crystal
remains monoclinic up to the melting temperature. The RbPb2Br5 compound belongs to the I4/mcm tetragonal modification and does not undergo structural transformations.
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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Mineral & Petrog, Siberian Div, Novosibirsk 630058, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute of Mineralogy and Petrography, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630058, Russian Federation
Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Isaenko, L. I.; Pashkov, V. M.; Pevnev, I. V.
}
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6.
Lattice dynamics and
raman scattering spectrum of elpasolite Rb2KScF6: Comparative analysis / S. N. Krylova [et al.]> // Phys. Solid State. - 2004. -
Vol. 46
,
Is. 7
. - P. 1311-1319,
DOI
10.1134/1.1778457. - Cited References: 18 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITION
LIGHT-SCATTERING
OPTICAL PHONONS
SOFT-MODE
CRYSTAL
Аннотация:
Raman scattering spectra of elpasolite Rb2KScF6 are studied in a wide temperature range including two phase transitions: from the cubic to the tetragonal phase and then to the monoclinic phase. The experimental Raman scattering spectrum is compared with the lattice vibration spectra of these phases calculated using an ab initio approach. A number of anomalies (caused by structural rearrangement during the phase transitions) are revealed and quantitatively analyzed in the ranges of both the intramolecular vibrations of the octahedron molecular ScF6 ions and low-frequency intermolecular lattice vibrations. The interaction between low-frequency intramolecular vibrations and the intermolecular modes is found to be significant, and strong resonance interaction of the rotational soft modes (which are recovered below the phase transition points) with hard low-frequency vibrations of the rubidium ion sublattice is detected. These interactions are shown to substantially complicate the spectra. (C) 2004 MAIK "Nauka / Interperiodica".
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Univ Maine, F-72085 Le Mans 9, France
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Universite du Maine, Le Mans, Cedex 9, 72085, France
Доп.точки доступа:
Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Bulou, A.; Krylov, A. S.; Крылов, Александр Сергеевич; Zamkova, N. G.; Замкова, Наталья Геннадьевна
}
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7.
Low-temperature behavior of
the magnetoelastic characteristics of praseodymium ferroborate / G. A. Zvyagina [et al.]> // Low Temp. Phys. - 2010. -
Vol. 36
,
Is. 4
. - P. 296-302 ; Физика низких температур,
DOI
10.1063/1.3420962. - Cited References: 16 . - ISSN 1063-777X
РУБ
Physics, Applied
Рубрики:
CRYSTAL
STATE
ND
Аннотация:
The behavior of the elastic moduli and sound absorption in a PrFe(3)(BO(3))(4) single
crystal
at low temperatures is studied. A transition of the magnetic subsystem into an antiferromagnetically ordered state is manifested in the temperature behavior of the sound velocities and absorption. The characteristic behavior of the elastic properties of PrFe(3)(BO(3))(4) in an external magnetic field is observed. A phenomenological theory that gives a qualitative description of the observed features is constructed. It is proposed that a weak magnetic moment exists in the
crystal
. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3420962]
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Держатели документа:
[Zvyagina, G. A.
Zhekov, K. R.
Bilych, I. V.
Zvyagin, A. A.] Natl Acad Sci Ukraine, BI Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
[Zvyagin, A. A.] Tech Univ Dresden, Inst Solid State Phys, D-01069 Dresden, Germany
[Bezmaternykh, L. N.
Gudim, I. A.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
B. I. Verkin Inst. for Low-Temperature Physics, Engineering, National Academy of Sciences of Ukraine, pr. Lenina 47, Kharkov 61103, Ukraine
B. I. Verkin Inst. for Low-Temperature Physics, Engineering, National Academy of Sciences of Ukraine, pr. Lenina 47, Kharkov 61103, Ukraine
Institute for Solid State Physics, Technical University Dresden, Dresden D-01069, Germany
L. V. Kirenskii Inst. of Physics of the Siberian Branch, The Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Zvyagina, G. A.; Zhekov, K. R.; Bilych, I. V.; Zvyagin, A. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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8.
Magnetic structure in
iron borates RFe3(BO3)(4) (R = Er, Pr): a neutron diffraction and magnetization study / C. . Ritter [et al.]> // J. Phys.: Condens. Matter. - 2010. -
Vol. 22
,
Is. 20
. - Ст. 206002,
DOI
10.1088/0953-8984/22/20/206002. - Cited References: 22. - This work was supported by RFBR, grant no. 10-02-00765, and by the Physical Sciences Department of RAS, project no. 1.1.1.1. . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
GDFE3(BO3)(4)
DYFE3(BO3)(4)
CRYSTAL
Кл.слова (ненормированные):
Antiferromagnetics
--
Crystallographic structure
--
Iron borate
--
Low temperatures
--
Magnetic ordering
--
Magnetic propagation
--
Magnetization measurements
--
Rare-earth sublattices
--
Space Groups
--
Spin reorientation
--
Sub-lattices
--
Temperature range
--
Unit cells
--
Anisotropy
--
Antiferromagnetic materials
--
Antiferromagnetism
--
Erbium
--
Erbium compounds
--
Magnetic devices
--
Magnetic properties
--
Magnetic structure
--
Magnetization
--
Neutron diffraction
--
Rare earths
--
Single crystals
--
Crystallography
Аннотация:
Neutron diffraction, susceptibility and magnetization measurements (for R = Er only) were performed on iron borates RFe3(BO3)(4) (R = Pr, Er) to investigate details of the crystallographic structure, the low temperature magnetic structures and transitions and to study the role of the rare earth anisotropy. PrFe3(BO3)(4), which crystallizes in the spacegroup R32, becomes antiferromagnetic at T-N = 32 K, with t = [0 0 3/2], while ErFe3(BO3)(4), which keeps the P3(1)21 symmetry over the whole studied temperature range 1.5 K < T < 520 K, becomes antiferromagnetic below T-N = 40 K, with tau = [0 0 1/2]. Both magnetic propagation vectors lead to a doubling of the crystallographic unit cell in the c-direction. Due to the strong polarization of the Fe-sublattice, the magnetic ordering of the rare earth sublattices appears simultaneously at T-N. The moment directions are determined by the rare earth anisotropy: easy-axis along c for PrFe3(BO3)(4) and easy-plane a-b for ErFe3(BO3)(4). There are no spin reorientations present in either of the two compounds but there is the appearance below 10 K of a minority phase in the Er-compound adopting a 120 degrees arrangement of the Er-moments.
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Держатели документа:
[Ritter, C.] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[Vorotynov, A.
Pankrats, A.
Petrakovskii, G.
Temerov, V.
Gudim, I.] RAS, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Petrakovskii, G.] Siberian Fed Univ, Krasnoyarsk, Russia
[Szymczak, R.] Inst Phys PAS, Warsaw, Poland
ИФ СО РАН
Institut Laue-Langevin, Boite Postale 156, F-38042 Grenoble, France
L v Kirenskii Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Physics PAS, Warsaw, Poland
Доп.точки доступа:
Ritter, C.; Vorotynov, A. M.; Воротынов, Александр Михайлович; Pankrats, A. I.; Панкрац, Анатолий Иванович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Szymczak, R.
}
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9.
Single magnetic chirality
in the magnetoelectric NdFe3((BO3)-B-11)(4) / M. . Janoschek [et al.]> // Phys. Rev. B. - 2010. -
Vol. 81
,
Is. 9
. - Ст. 94429,
DOI
10.1103/PhysRevB.81.094429. - Cited References: 55 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
NEUTRON-DIFFRACTION
PHASE-TRANSITIONS
SLOW-NEUTRONS
CRYSTAL
NDFE3(BO3)(4)
EXTINCTION
NUCLEAR
ORDER
MNSI
ANTIFERROMAGNETS
Аннотация:
We have performed an extensive study of single crystals of the magnetoelectric NdFe3 ((BO3)-B-11)(4) by means of a combination of single-
crystal
neutron diffraction and spherical neutron polarimetry. Our investigation did not detect significant deviations at low temperatures from space group R32 concerning the chemical structure. With respect to magnetic ordering our combined results demonstrate that in the commensurate magnetic phase below T-N approximate to 30 K all three magnetic Fe moments and the magnetic Nd moment are aligned ferromagnetically in the basal hexagonal plane but align antiferromagnetically between adjacent planes. The phase transition to the low-temperature incommensurate (IC) magnetic structure observed at T-IC approximate to 13.5 K appears to be continuous. By means of polarized neutron studies it could be shown that in the incommensurate magnetic phase the magnetic structure of NdFe3((BO3)-B-11)(4) is transformed into a long-period antiferromagnetic helix with single chirality. Close to the commensurate-incommensurate phase transition third-order harmonics were observed, which in addition indicate the formation of magnetic solitons.
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Держатели документа:
[Janoschek, M.
Fischer, P.
Schefer, J.
Roessli, B.
Pomjakushin, V.] Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
[Janoschek, M.
Fischer, P.
Schefer, J.
Roessli, B.
Pomjakushin, V.] ETH, CH-5232 Villigen, Switzerland
[Janoschek, M.] Tech Univ Munich, Phys Dept E21, D-85748 Garching, Germany
[Meven, M.] Tech Univ Munich, Forsch Neutronenquelle Heinz Maier Leibnitz FRM 2, D-85748 Garching, Germany
[Petricek, V.] ASCR, Vvi, Inst Phys, Prague 18221 8, Czech Republic
[Petrakovskii, G.
Bezmaternikh, L.] RAS, SB, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Laboratory for Neutron Scattering, Paul Scherrer Institut and ETH Zurich, CH-5232 Villigen PSI, Switzerland
Physik Department E21, Technische Universitat Munchen, D-85748 Garching, Germany
Department of Physics, University of California, San Diego, San Diego, CA 92093-0354, United States
Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universitat Munchen, D-85748 Garching, Germany
Institute of Physics, ASCR, V.v.i, Na Slovance 2, 182 21 Praha 8, Czech Republic
Institute of Physics, SB RAS, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Janoschek, M.; Fischer, P.; Schefer, J.; Roessli, B.; Pomjakushin, V.; Meven, M.; Petricek, V.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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10.
Mel'nikova, S. V.
Phase transitions in the oxyfluoride (NH4)(3)NbOF6 / S. V. Mel'nikova, N. M. Laptash, A. L. Zhogal'> // Phys. Solid State. - 2007. -
Vol. 49
,
Is. 5
. - P. 958-962,
DOI
10.1134/S1063783407050253. - Cited References: 11 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
RAY-DIFFRACTION INVESTIGATIONS
DISTORTED PHASES
SYMMETRY
DISORDER
CRYSTAL
Аннотация:
(NH4)(3)NbOF6 single crystals were grown, polarization-optical studies were performed, and birefringence was measured over the temperature range 90-500 K. A sequence of first-order structural phase transitions was found at temperatures T (1 down arrow) = 259.7 K and T (2 down arrow) = 257.7 K with temperature hysteresis delta T-1 = 0.9 K and delta T-2 = 1.9 K. The transitions are accompanied by twinning and the following change in the
crystal
symmetry: cubic paired left right arrows tetragonal paired left right arrows monoclinic. Optical second harmonic generation is found to occur at room temperature, which indicates that the cubic phase is not centrosymmetric. It is assumed that the phase transitions are ferroelastic and ferroelectric in nature.
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Публикация на русском языке
Мельникова, Светлана Владимировна. Фазовые переходы в оксифториде (NH4)3NbOF6 [Текст] / С. В. Мельникова, Н. М. Лапташ, А. Л. Жогаль // Физ. тверд. тела. - Т. 49 № 5. - С. 908-912
Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, 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:
Laptash, N. M.; Zhogal', A. L.; Мельникова, Светлана Владимировна
}
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11.
Zobov, V. E.
On the Second Moment of the Multiquantum NMR Spectrum of a Solid / V. E. Zobov, A. A. Lundin> // Russ. J. Phys. Chem. B. - 2008. -
Vol. 2
,
Is. 5
. - P. 676-683,
DOI
10.1134/S1990793108050035. - Cited References: 39 . - ISSN 1990-7931
РУБ
Physics, Atomic, Molecular & Chemical
Рубрики:
MULTIPLE-QUANTUM NMR
DEPENDENT BEHAVIOR
MAGNETIC-MOMENTS
SPIN CLUSTERS
LINE-SHAPE
DYNAMICS
COHERENCES
SYSTEMS
CRYSTAL
GROWTH
Аннотация:
New experimental data on the time dependence of an increase in the number of correlated spins under the conditions of the observation of the multiquantum NMR spectrum of a solid are processed on the basis of a microscopic theory for describing the growth of the second moment of multiquantum NMR developed by us earlier. As follows from the theory, the growth is an exponential function of time for crystals with quite diverse structures. The results are discussed on the basis of semiphenomenological models.
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Держатели документа:
[Zobov, V. E.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Lundin, A. A.] Russian Acad Sci, NN Semenov Chem Phys Inst, Moscow 117977, Russia
ИФ СО РАН
Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
}
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12.
Enhanced cyan emission
and optical tuning of Ca3Ga4O9:Bi3+ for high-quality full-spectrum white light-emitting diodes / D. J. Liu, X. H. Yun, G. G. Li [et al.]> // Adv. Opt. Mater. - 2020. -
Vol. 8
,
Is. 22
. - Ст. 2001037,
DOI
10.1002/adom.202001037. - Cited References: 55. - This work was financially supported by the National Natural Science Foundation of China (NSFC No. 51932009, 51720105015, 51672265, 51672266, 51672257 and 51672259), the Key Research Program of Frontier Sciences, CAS (Grant No. YZDY-SSW-JSC018), Science and Technology Cooperation Project between Chinese and Australian Governments (2017YFE0132300), the Jiangmen Innovative Research Team Program (2017), and the Major Program of Basic Research and Applied Research of Guangdong Province (2017KZDXM083) . - ISSN 2195-1071
Перевод заглавия:
Улучшенное голубое излучение и оптическая настройка Ca3Ga4O9:Bi3+ для получения высококачественных белых светодиодов полного спектра
РУБ
Materials Science, Multidisciplinary + Optics
Рубрики:
ENERGY-TRANSFER
TUNABLE LUMINESCENCE
PHOSPHOR
CRYSTAL
MODULATION
Кл.слова (ненормированные):
cyan-emitting phosphors
--
full-spectrum white lighting
--
optical tuning
--
single-phased white light-emitting diodes
Аннотация:
Highly efficient cyan‐emitting phosphor materials are indispensable for closing the cyan gap in spectra of the traditional phosphor‐converted white light‐emitting diodes (WLEDs) to achieve high‐quality full‐spectrum white lighting. In this work, bright cyan‐emitting Ca3Ga4O9 (CGO):0.02Bi3+,0.07Zn2+ phosphor is developed to bridge the cyan gap. Such a Bi3+,Zn2+ codoping enhances the cyan emission of CGO:0.02Bi3+ by 4.1 times due to the influence of morphology and size of phosphor particles, charge compensation and lattice distortion. Interestingly, codoping La3+ ions into the current system can achieve a photoluminescence tuning of CGO:0.02Bi3+ from cyan to yellowish‐green by crystallographic site engineering. Besides, Bi3+–Eu3+ energy transfer is successfully realized in CGO:0.02Bi3+,0.07Zn2+,nEu3+ phosphors and the emission color tuning from cyan to orange is observed. The investigation of thermal quenching behaviors reveals that the incorporation of Zn2+ and La3+ improves the thermal stability of CGO:0.02Bi3+. Finally, CGO:0.02Bi3+,0.07Zn2+,0.10Eu3+ phosphor is employed to obtain a single‐phased warm WLED device. A full‐spectrum WLED device with remarkable color rendering index (Ra) of 97.4 and high luminous efficiency of 69.72 lm W−1 is generated by utilizing CGO:0.02Bi3+,0.07Zn2+ phosphor. This result suggests the important effect of CGO:0.02Bi3+,0.07Zn2+ phosphor on closing the cyan gap, providing new insights of cyan‐emitting phosphors applied in full‐spectrum white lighting.
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Держатели документа:
Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China.
Univ Sci & Technol China, Sch Appl Chem & Engn, Hefei 230026, Peoples R China.
China Univ Geosci, Fac Mat Sci & Chem, Engn Res Ctr Nanogeomat, Minist Educ, Wuhan 430074, Peoples R China.
RAS, SB, Lab
Crystal
Phys, Kirensky Inst Phys,Fed Res Ctr,KSC, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Shandong Univ, Sch Mat Sci & Engn, Jinan 266071, Peoples R China.
Wuyi Univ, Sch Appl Phys & Mat, Jiangmen 529020, Guangdong, Peoples R China.
Доп.точки доступа:
Liu, Dongjie; Yun, Xiaohan; Li, Guogang; Dang, Peipei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lian, Hongzhou; Shang, Mengmeng; Lin, Jun
}
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13.
Intrinsic isotropic near-zero
thermal expansion in Zn4B6O12X (X = O, S, Se) / Y. Q. Liu, D. J. Mei, N. Z. Wang [et al.]> // ACS Appl. Mater. Interfaces. - 2020. -
Vol. 12
,
Is. 34
. - P. 38435-38440,
DOI
10.1021/acsami.0c12351. - Cited References: 43. - This work was supported by the National Scientific Foundations of China (Grants 51872297, 51702330, 11974360, 51972208, 51890864, and 51802321), Russian Foundation for Basic Research (Grant 17-52-53031), and Fujian Institute of Innovation (FJCXY18010201) in CAS. X.J. acknowledges the support from the Youth Innovation Promotion Association in CAS (Grant 2017035) and Youth Talent Promotion Project from China Association for Science and Technology . - ISSN 1944-8244. - ISSN 1944-8252
Перевод заглавия:
Близкое к нулю изотропное тепловое расширение в Zn4B6O12X (X = O, S, Se)
РУБ
Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
CRYSTAL
Кл.слова (ненормированные):
intrinsic isotropic zero thermal expansion
--
phonon mode
--
first-principals vibration analysis
--
borate
--
sodalite cage structure
Аннотация:
Zero thermal expansion (ZTE) materials, keeping size constant as temperature varies, are valuable for resisting the deterioration of the performance from environmental temperature fluctuation, but they are rarely discovered due to the counterintuitive temperature-size effect. Herein, we demonstrate that a family of borates with sodalite cage structure, Zn4B6O12X (X = O, S, Se), exhibits intrinsic isotropic near-ZTE behaviors from 5 to 300 K. The very low thermal expansion is mainly owing to the coupling rotation of [BO4] rigid groups constrained by the bonds between Zn and cage-edged O atoms, while the central atoms in the cage have a negligible contribution. Our study has significant implications on the understanding of the ZTE mechanism and exploration of new ZTE materials.
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Держатели документа:
Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China.
Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Shanghai Univ Engn Sci, Coll Chem & Chem Engn, Shanghai 201620, Peoples R China.
Fed Res Ctr KSC SB RAS, Lab
Crystal
Phys, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Доп.точки доступа:
Liu, Youquan; Mei, Dajiang; Wang, Naizheng; Molokeev, M. S.; Молокеев, Максим Сергеевич; Jiang, Xingxing; Lin, Zheshuai
}
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14.
Electrical properties of
the polycrystalline BiFe0.95Co0.05O3 films / O. B. Romanova, V. V. Kretinin, S. S. Aplesnin [et al.]> // Phys. Solid State. - 2021. -
Vol. 63
. Is. 6. - P. 897-903,
DOI
10.1134/S1063783421060184. - Cited References: 34. - This study was supported by the Russian Foundation for Basic Research and the Belarusian Republican Foundation for Basic Research, project no. 20-52-00005 . - ISSN 1063-7834. - ISSN 1090-6460
РУБ
Physics, Condensed Matter
Рубрики:
BiFeO3 THIN-FILMS
PHASE-SEPARATION
CRYSTAL
MODEL
Кл.слова (ненормированные):
semiconductor films
--
magnetoresistance
--
magnetoimpedance
--
magnetization
Аннотация:
Semiconductor BiFe0.95Co0.05O3 thin-film compounds have been synthesized by a burst technique. The film surface morphology and the effect of electronic doping via substitution of cobalt ions for trivalent iron on the optical, magnetic, and kinetic properties have been investigated in the temperature range of 77-600 K in magnetic fields of up to 12 kOe. Two electron relaxation channels have been found in the impedance spectrum in the frequency range of 0.1-1000 kHz. The negative magnetoresistance in the anomalous magnetization region and the maximum magnetoimpedance in the vicinity of the surface phase transition have been established. Using the Hall measurements, carrier types dominating in the magnetoresistance and magnetoimpedance effects have been determined. The magnetization anomalies have been explained in the model of superparamagnetic clusters and the magnetoresistance, by the carrier scattering by spin fluctuations.
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Публикация на русском языке
Электрофизические свойства поликристаллических пленок BiFe0.95Co0.05O3 [Текст] / О. Б. Романова, В. В. Кретинин, С. С. Аплеснин [и др.] // Физ. тверд. тела. - 2021. - Т. 63 Вып. 6. - С. 721-728
Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian State Univ Sci & Technol, Krasnoyarsk 660014, Russia.
Natl Acad Sci Belarus, Sci & Pract Mat Res Ctr, Minsk 220072, BELARUS.
Доп.точки доступа:
Romanova, O. B.; Романова, Оксана Борисовна; Kretinin, V. V.; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Sitnikov, M. N.; Udod, L. V.; Удод, Любовь Викторовна; Yanushkevich, K. I.; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Belarusian Republican Foundation for Basic Research [20-52-00005]
}
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15.
Tunable femtosecond frequency
doubling in random domain structure of strontium tetraborate / A. S. Aleksandrovsky [et al.]> // Opt. Commun. - 2009. -
Vol. 282
,
Is. 11
. - P. 2263-2266,
DOI
10.1016/j.optcom.2009.02.070. - Cited Reference Count: 16. - Гранты: The work was supported by the RFBR Grant 09-02-00670, Grants of the President of the Russian Federation for the support of leading scientific schools (Nos. SS-1011.2008.2 and SS-3818.2008.3), Grant No. RNP.2.1.1.3455, and the Projects 2.5.2 of PSB RAS, Nos. 5 and 27.1 of SB RAS. - Финансирующая организация: RFBR [09-02-00670]; President of the Russian Federation [SS-1011.2008.2, SS-3818.2008.3]; PSB RAS [2.5.2]; SB RAS [5, 27.1]; [RNP.2.1.1.3455] . - ISSN 0030-4018
Рубрики:
2ND-HARMONIC GENERATION
HARMONIC-GENERATION
BARIUM NIOBATE
CRYSTAL
Кл.слова (ненормированные):
Domain structures
--
Femtosecond
--
Frequency-doubling
--
Harmonic frequencies
--
Noncollinear
--
Nonlinear photonic crystals
--
Photonic structures
--
Second harmonics
--
Second-harmonic generations
--
Spatial spectrum
--
Tetraborate
--
Harmonic generation
--
Photonic crystals
--
Strontium
--
Harmonic analysis
Аннотация:
Efficient tunable femtosecond phase-matched noncollinear second-harmonic generation in randomized nonlinear photonic
crystal
of strontium tetraborate is obtained. Spatial spectrum of nonlinear photonic structure is not flat but enables tuning of the harmonic frequency in the range from 355 to 460 nm. The narrowing of the bandwidth of second harmonic is found to be of order of 10-20%. (C) 2009 Elsevier B.V. All rights reserved.
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Держатели документа:
RAS, SB, LV Kirensky Phys Inst, Coherent Opt Lab, Krasnoyarsk 600036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia
Доп.точки доступа:
Aleksandrovsky, A.S.; Vyunishev, A. M.; Вьюнышев, Андрей Михайлович; Zaitsev, A.I.; Zamkov, A. V.; Замков, Анатолий Васильевич; Slabko, V.V.
}
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16.
Chemistry of vinylidene
complexes. XVIII. Synthesis and molecular structure of the novel trinuclear mu(3)-vinylidene complex CpReFePt(mu(3)-C=CHPh)(CO)(6)(PPh(3)) / A. B. Antonova [et al.]> // J. Organomet. Chem. - 2009. -
Vol. 694
,
Is. 1
. - P. 127-130,
DOI
10.1016/j.jorganchem.2008.08.037. - Cited Reference Count: 17. - Гранты: This work was supported by the Council of the Russian Federation President for Support of Young Scientists and Leading Scientific Schools (Project No. NSch-4137.2006.2) and the Krasnoyarsk Regional Science Foundation (Grants 10TS145 and 17G002). - Финансирующая организация: Council of the Russian Federation President for Support of Young Scientists and Leading Scientific Schools [NSch-4137.2006.2]; Krasnoyarsk Regional Science Foundation [10TS145, 17G002] . - ISSN 0022-328X
Рубрики:
CLUSTERS
CRYSTAL
MNFEPT
Кл.слова (ненормированные):
Vinylidene complexes
--
Heterometallic clusters
--
Rhenium
--
Iron
--
Platinum
--
Crystal
structure
--
Crystal
structure
--
Heterometallic clusters
--
Iron
--
Platinum
--
Rhenium
--
Vinylidene complexes
--
Atomic physics
--
Atoms
--
Bond length
--
Chemical bonds
--
Coordination reactions
--
Crystal
structure
--
Iron compounds
--
Nuclear magnetic resonance
--
Nuclear magnetic resonance spectroscopy
--
Platinum
--
Quantum chemistry
--
Rhenium
--
Rhenium compounds
--
Bond angles
--
Co groups
--
Double bonds
--
Fe atoms
--
Heterometallic
--
Heterometallic clusters
--
Pt atoms
--
Trimetallic
--
Vinylidene complexes
--
X-ray diffractions
--
Platinum compounds
Аннотация:
The interaction between Cp(CO)(2)RePt(mu-C=CHPh)(PPh(3))(2) (1) and Fe(2)(CO)(9) afforded the new heterometallic mu(3)-vinylidene cluster CpReFePt(mu(3)-C=CHPh)(CO)(6)(PPh(3)) (2). An X-ray diffraction study shows the complex 2 possesses a trimetallic Re-Fe-Pt chain core. The bond lengths are Re-Fe 2.8221(8), Fe-Pt 2.5813(8) angstrom; the Re center dot center dot center dot Pt distance is 3.3523(7) angstrom; the bond angle Re-Fe-Pt is 76.55(3)degrees. The mu(3)-C=CHPh ligand is eta(1)-bound to the Re and Pt atoms and eta(2)-coordinated to the Fe atom. The C=C bond length is 1.412(4) angstrom. The Pt atom is coordinated by the PPh(3) and CO groups. Complex 2 is characterized by the IR and (1)H, (13)C and (31)P NMR spectra. (C) 2008 Elsevier B.V. All rights reserved.
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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660049, Russia
Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, AN Nesmeyanov Organoelement Cpds Inst, Moscow 119991, Russia
Доп.точки доступа:
Antonova, A.B.; Chudin, O.S.; Pavlenko, N.I.; Sokolenko, W.A.; Rubaylo, A.I.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Semeikin, O.V.
}
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17.
Bismuth activated full
spectral double perovskite luminescence materials by excitation and valence control for future intelligent LED lighting / Y. Wei, H. Yang, Z. Y. Gao [et al.]> // Chem. Commun. - 2020. -
Vol. 56
,
Is. 64
. - P. 9170-9173,
DOI
10.1039/d0cc03975f. - Cited References: 27. - This work was supported by the National Natural Science Foundation of China (Grant No. 51672259) and the Fundamental Research Funds for the National Universities, China University of Geosciences (Wuhan) (No. 1910491T02) . - ISSN 1359-7345. - ISSN 1364-548X
Перевод заглавия:
Активированные висмутом люминесцентные материалы двойных перовскитов, с полным спектром излучения, который получается за счет управления возбуждением и валентностью, для интеллектуального светодиодного освещения в будущем
РУБ
Chemistry, Multidisciplinary
Рубрики:
PHOTOLUMINESCENCE
PHOSPHORS
Bi3+
MODULATION
CRYSTAL
Аннотация:
A novel La2Mg1.14Zr0.86O6:Bi3+ double perovskite phosphor with excitation-induced blue/green photoluminescence tuning is reported. By designing Bi3+ → Eu3+ energy transfer, single-composition white light with wide-scale adjustable corrected color temperatures (CCTs) is successfully achieved. This work initiates a new insight to explore phosphors with excitation-induced photoluminescence tuning and wide CCT control for future intelligent LED lighting.
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Держатели документа:
China Univ Geosci, Engn Res Ctr Nanogeomat, Minist Educ, Fac Mat Sci & Chem, Wuhan 430074, Hubei, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab
Crystal
Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Доп.точки доступа:
Wei, Y.i.; Yang, Hang; Gao, Zhiyu; Xing, Gongcheng; Molokeev, M. S.; Молокеев, Максим Сергеевич; Li, Guogang
}
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18.
Shabanov, V. F.
Manifestation of vacancies in spectra of low frequencies and the calculations of migration energy in paradichlorobenzene and paradichlorobenzene at different temperatures / V. F. Shabanov, M. A. Korshunov> // Fiz. Tverd. Tela. - 1995. -
Vol. 37
,
Is. 11
. - P. 3463-3469. - Cited References: 13 . - ISSN 0367-3294
РУБ
Physics, Condensed Matter
Рубрики:
CRYSTAL
ALPHA
WOS
Доп.точки доступа:
Korshunov, M. A.; Коршунов, Михаил Анатольевич; Шабанов, Василий Филиппович
}
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19.
Investigation of the
influence of gradual substitution K a dagger" Rb on the structure and phase transition in K (x) Rb1-x Pb2Br5 solid solutions / L. I. Isaenko [et al.]> // Phys. Solid State. - 2009. -
Vol. 51
,
Is. 3
. - P. 589-592,
DOI
10.1134/S1063783409030251. - Cited References: 5. - This study was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools ( grant no. NSh-1011.2008.2). . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
CRYSTAL
Аннотация:
Single crystals of K (x) Rb1 - x Pb2Br5 solid solutions have been grown and investigated using X-ray diffraction and polarized light microscopy in the temperature range 270-640 K. The regions of existence of the tetragonal (I4/mcm) and monoclinic (P2(1)/c) phases have been determined. It has been demonstrated that the partial introduction of rubidium into KPb2Br5 leads to an increase in the temperature of the ferroelastic phase transition (P2(1)/ca dagger"mmm), so that it approaches the melting temperature. In the solid solutions with x a parts per thousand 0.4-0.5, the temperature region of existence of the orthorhombic phase is narrowed to a parts per thousand 1-2 K. It has been revealed that an increase in the potassium content in the material results in a considerable increase in the incorporation coefficient of Er3+ ions.
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Держатели документа:
[Isaenko, L. I.
Merkulov, A. A.
Pashkov, V. M.
Tarasova, A. Yu.] Russian Acad Sci, Trofimuk United Inst Geol Geophys & Mineral, Siberian Branch, Novosibirsk 630090, Russia
[Mel'nikova, S. V.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Akad Gorodok, Krasnoyarsk 660036, Russia
ИФ СО РАН
Trofimuk United Institute of Geology, Geophysics, and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Koptyuga 3, Novosibirsk 630090, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Isaenko, L. I.; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Merkulov, A. A.; Pashkov, V. M.; Tarasova, A. Y.; President of the Russian Federation [NSh-1011.2008.2]
}
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20.
Synthesis and study
of structural, thermodynamic, and magnetic properties of NaxLi1–xFeGe2O6 (x = 0.1–0.9) compounds / T. V. Drokina [et al.]> // Phys. Solid State. - 2016. -
Vol. 58
,
Is. 7
. - P. 1361-1370,
DOI
10.1134/S1063783416070143. - Cited References: 20 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
CLINOPYROXENE-TYPE LiFeGe2O6
PHASE-TRANSITION
PYROXENES
TEMPERATURE
LiFeSi2O6
CRYSTAL
Аннотация:
The properties of NaxLi1–xFeGe2O6 (x = 0.1–0.9) solid solutions obtained via a solid-phase synthesis have been measured by X-ray diffraction, calorimetry, and magnetic method. The order–disorder transformations in low-dimensional NaxLi1–xFeGe2O6 (x = 0.1–0.9) spin systems with predominately antiferromagnetic exchange interaction have been revealed in the low-temperature susceptibility dependences. The study of thermal and physical properties has confirmed that substituting the sodium ions with the lithium ones induces the first-order structural phase transitions of the displacement type which are characterized by a symmetry change in monoclinic crystals from high-temperature C2/c space group to low-temperature P21/c space group. © 2016, Pleiades Publishing, Ltd.
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Публикация на русском языке
Синтез и исследование структурных, термодинамических и магнитных особенностей соединений NaxLi1-xFeGe2O6 (x=0.1-0.9) [Текст] / Т. В. Дрокина [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2016. - Т. 58 Вып. 7. - С. 1316–1324
Держатели документа:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50-38, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, ul. Serysheva 47, Khabarovsk, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Drokina, T. V.; Дрокина, Тамара Васильевна; Petrakovskii, G. A.; Петраковский, Герман Антонович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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