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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : BAGAUTDINOV B. S., ALEKSANDROVA I. P.
Заглавие : X-RAY-INVESTIGATIONS OF MODULATIONS IN CS2ZNI4
Разночтения заглавия :us: X-ray investigations of modulations in Cs2ZnI4
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1994. - Vol. 90, Is. 12. - P817-820. - ISSN 0038-1098, DOI 10.1016/0038-1098(94)90251-8
Примечания : Cited References: 8
Предметные рубрики: INCOMMENSURATE PHASES
CRYSTALS
CS2CDI4
Аннотация: The X-ray diffractometer patterns of a reciprocal space have been analyzed in the modulated phases of Cs2ZnI4 crystals. The character of the atomic displacements in the modulation wave has been established. The temperature behaviour of both a modulation wave vector and amplitude has been determined from the position and intensity of satellite reflections.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarova I. P., Verin I. A., Aleksandrov K. S.
Заглавие : X-ray diffraction study of RbLiCrO4
Коллективы : European meeting on ferroelectricity
Место публикации : Ferroelectrics. - 1991. - Vol. 124, Is. 1. - P.91-96. - ISSN 0015-0193, DOI 10.1080/00150199108209420
Примечания : Cited References: 12
Предметные рубрики: LITHIUM POTASSIUM-SULFATE
THERMAL VIBRATIONS
CRYSTALS
PROGRAM
KLISO4
LIKSO4
Аннотация: Crystal structure of RbLiCrO4 was determined in G3 phase (sp. gr. P31c) at 293, 428, 493, 523 K and in G2 phase (sp. gr. P63) at 553, 583 K applying X-ray diffraction data. The investigated crystals exhibit ‘twinning by merohedry’. The analysis of intensities and influence of anomalous scattering on them allowed us to choose twin elements and atomic configurations of twin domains for all the investigated specimens.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov A. K., Shalaev M. I., Myslivets S. A., Slabko V. V.
Заглавие : Unidirectional amplification and shaping of optical pulses by three-wave mixing with negative phonons
Коллективы : US Air Force Office of Scientific Research [FA950-12-1-298]; US National Science Foundation [ECCS-1028353]; Presidium of the Russian Academy of Sciences [24-31]; Russian Federal Program on Science, Education and Innovation [14.A18.21.1942]
Место публикации : Appl. Phys. A: Springer, 2013. - Vol. 115, Is. 2. - P.523-529. - ISSN 0947-8396, DOI 10.1007/s00339-013-8078-4. - ISSN 1432-0630
Примечания : Cited References: 32. - This work was supported in parts by the US Air Force Office of Scientific Research under Grant No. FA950-12-1-298, by the US National Science Foundation under Grant No. ECCS-1028353, by the Presidium of the Russian Academy of Sciences under Grant No. 24-31 and by the Russian Federal Program on Science, Education and Innovation under Grant No. 14.A18.21.1942.
Предметные рубрики: LEFT-HANDED METAMATERIALS
2ND-HARMONIC GENERATION
INDEX METAMATERIALS
NONLINEAR OPTICS
PARAMETRIC AMPLIFICATION
COMPENSATING LOSSES
BACKWARD WAVES
OSCILLATOR
CRYSTALS
Аннотация: A possibility to greatly enhance frequency-conversion efficiency of stimulated Raman scattering is shown by making use of extraordinary properties of three-wave mixing of ordinary and backward waves. Such processes are commonly attributed to negative-index plasmonic metamaterials. This work demonstrates the possibility to replace such metamaterials that are very challenging to engineer by readily available crystals which support elastic waves with contra-directed phase and group velocities. The main goal of this work was to investigate specific properties of indicated nonlinear optical process in short-pulse regime and to show that it enables elimination of fundamental detrimental effect of fast damping of optical phonons on the process concerned. Among the applications is the possibility of creation of a family of unique photonic devices such as unidirectional Raman amplifiers and femtosecond pulse shapers with greatly improved operational properties.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pogorel'tsev E. I., Bogdanov E. V., Molokeev M. S., Voronov V. N., Isaenko L. I., Zhurkov S. A., Laptash N. M., Gorev M. V., Flerov I. N.
Заглавие : Thermodynamic Properties and Structure of Oxyfluorides Rb(2)KMoO(3)F(3) and K(2)NaMoO(3)F(3)
Разночтения заглавия :авие SCOPUS: Thermodynamic properties and structure of oxyfluorides Rb2KMoO3F3 and K2NaMoO3F3
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 6. - P1202-1211. - ISSN 1063-7834, DOI 10.1134/S1063783411060266
Примечания : Cited References: 24. - This study was supported by the Siberian Branch of the Russian Academy of Sciences within the framework of the Interdisciplinary Integration project no. 34 SO RAN 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-4645-2010.2).
Предметные рубрики: T PHASE-DIAGRAM
HEAT-CAPACITY
TRANSITIONS
(NH4)(3)MOO3F3
(NH4)(3)TIOF5
(NH4)(3)WO3F3
RB2KTIOF5
CRYSTALS
CRYOLITE
DISORDER
Аннотация: According to the results of calorimetric and structural studies, the Fm (3) over barm phase in K(2)NaMoO(3)F(3) remains stable at least to 100 K. No ferroelectric transformation assumed earlier has been revealed in a series of Rb(2)KMoO(3)F(3) samples prepared using various technologies. Only a phase transition of nonferroelectric origin has been observed near 195 K, and its thermodynamic characteristics have been determined. An analysis of the stability of the cubic structure of molybdenum fluorine-oxygen elpasolites-cryolites has been performed in the framework of the hypothesis on strengths of interatomic bonds. The barocaloric effect in Rb(2)KMoO(3)F(3) has been estimated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V.
Заглавие : Thermodynamic properties and phase-transitions in halide perovskitelike ferroelastics
Место публикации : Izv. Akad. Nauk Ser. Fiz. - 1995. - Vol. 59, Is. 9. - P.48-53. - ISSN 1026-3489
Примечания : Cited References: 28
Предметные рубрики: HYDROSTATIC-PRESSURE
CRYSTALS
RB3CD2CL7
RBALF4
CSSCF4
WOS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Tressaud A.
Заглавие : Thermodynamic properties and p-T phase diagrams of (NH4)(3)M3+F6 cryolites (M3+: Ga, Sc)
Разночтения заглавия :авие SCOPUS: Thermodynamic properties and p-T phase diagrams of (NH4)3M3+F6 cryolites (M3+: Ga, Sc)
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 1999. - Vol. 11, Is. 39. - P7493-7500. - ISSN 0953-8984, DOI 10.1088/0953-8984/11/39/306
Примечания : Cited References: 19
Предметные рубрики: TRANSITIONS
CRYSTALS
Аннотация: Calorimetric and high pressure experiments are used to establish thermodynamic features of (NH4)(3)M3+F6 cryolites with M3+: Ga, Sc as they undergo one and three structural phase transitions, respectively. The heat capacity measurements performed between 80 K and 370 K, using an adiabatic calorimeter, have shown that all phase transitions under study are first order with different closeness to the tricritical point. The total entropy change in the Sc compound connected with the successive transformations is almost equal to the entropy change in the Ga cryolite. The effect of hydrostatic pressure has been studied up to 0.6 GPa, using differential thermographic analysis. The p-T phase diagrams of both cryolites were found to be rather complicated, including triple points. The experimental results are considered as connected with order-disorder phase transitions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Dudnikov V. A., Gorev M. V., Vereshchagin S. N., Solov’ev L. A., Ovchinnikov S. G.
Заглавие : Thermal properties of rare earth cobalt oxides and of La1–xGdxCoO3 solid solutions
Место публикации : JETP Letters. - 2016. - Vol. 103, Is. 9. - P.607-612. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364016090058
Примечания : Cited References: 21. - This work was supported by the Russian Foundation for Basic Research, project nos. 16-02-00507 and 16-02-00098, and by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, project no. SP-1844.2016.1. The X-ray diffraction analysis of the crystal structure and the measurement of specific heat were supported by the Siberian Branch, Russian Academy of Sciences (project no. V.45.3.1).
Предметные рубрики: PROFILE REFINEMENT
SPIN
CRYSTALS
Аннотация: Powder X-ray diffraction data for the crystal structure, phase composition, and molar specific heat for La1‒xGdxCoO3 cobaltites in the temperature range of 300–1000 K have been analyzed. The behavior of the volume thermal expansion coefficient in cobaltites with isovalent doping in the temperature range of 100–1000 K is studied. It is found that the β(T) curve exhibits two peaks at some doping levels. The rate of the change in the occupation number for the high-spin state of cobalt ions is calculated for the compounds under study taking into account the spin–orbit interaction. With the Birch–Murnaghan equation of state, it is demonstrated that the low-temperature peak in the thermal expansion shifts with the growth of the pressure toward higher temperatures and at pressure P ∼ 7 GPa coincides with the second peak. The similarity in the behavior of the thermal expansion coefficient in the La1–xGdxCoO3 compounds with the isovalent substitution and the undoped LnCoO3 compound (Ln is a lanthanide) is considered. For the whole series of rare earth cobalt oxides, the nature of two specific features in the temperature dependence of the specific heat and thermal expansion is revealed and their relation to the occupation number for the high-spin state of cobalt ions and to the insulator–metal transition is established.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : BOVINA A. F., KOKOV I. T., MELNIKOVA S. V., MISYUL S. V.
Заглавие : THE SEQUENCE OF STRUCTURAL PHASE-TRANSITIONS IN THE 3-LAYER PEROVSKIT-TYPE RB4CD3CL10
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1990. - Vol. 32, Is. 9. - P2677-2683. - ISSN 0367-3294
Примечания : Cited References: 18
Предметные рубрики: CRYSTALS
(CH3NH3)2CDCL4
RB2CDCL4
WOS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Popov M. A.
Заглавие : The coordinate of the singular point of generating functions of clusters in the high-temperature dynamics of spin lattice systems with axially symmetric interaction
Место публикации : Theor. Math. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2003. - Vol. 136, Is. 3. - P1297-1311. - ISSN 0040-5779, DOI 10.1023/A:1025603416535
Примечания : Cited References: 25
Предметные рубрики: CONSISTENT FLUCTUATING FIELD
NUCLEAR-DOUBLE-RESONANCE
HEISENBERG PARAMAGNET
LINE SHAPE
RELAXATION
SPECTRUM
APPROXIMATION
CRYSTALS
MOMENT
CAF2
Ключевые слова (''Своб.индексиров.''): spin dynamics--singular points--expansion over the reciprocal space dimension--expansion over the reciprocal space dimension--singular points--spin dynamics
Аннотация: We investigate generating functions for equipped trees composed of double bonds of two sorts on a hypercubic lattice of dimension d with built-in fragments. Rules for constructing these clusters are chosen to ensure the estimate for coefficients of power series in time for the longitudinal and transverse autocorrelation functions of the spin system with axially symmetric interaction. We derive a system of two equations for the tree-generating functions and an equation for the generating functions of chains leading from the root to a fragment in a tree using the Bethe approximation and under the condition that mainly bonds of one sort are taken into account. For the face-centered hypercubic lattice, we find the First terms of the 1/d expansion for the coordinate of the singular point of the generating function in both the anisotropic and the isotropic cases taking fragments in the forms of a triangle from four bonds and a four-fold bound pair into account. The obtained result is written in terms of ratios of lattice sums and is generalized to nuclear spin systems with dipole-dipole interaction. The theoretical value of the singular-point coordinate agrees well with the experimental value calculated from the tail of the absorption spectrum of the nuclear magnetic resonance in a barium fluoride monocrystal.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Gudim I. A., Temerov V. L., Krylov A. S.
Заглавие : Temperature-dependent absorption lines observation in Raman spectra of SmFe3 (BO3)4 ferroborate
Коллективы : RFBR [18-02-00696, 18-02-00754]
Место публикации : J. Raman Spectrosc. - 2018. - Vol. 49, Is. 10. - P.1732-1735. - ISSN 0377-0486, DOI 10.1002/jrs.5430. - ISSN 1097-4555(eISSN)
Примечания : Cited References: 12. - RFBR, Grant/Award Numbers: 18-02-00696 and 18-02-00754
Предметные рубрики: SmFe3 (BO3)4
Ho1-xNdxFe3(BO3)4
CRYSTALS
Ключевые слова (''Своб.индексиров.''): absorption--ferroborates--huntite--level splitting--magnetic phase--transitions
Аннотация: The paper demonstrates possibilities of observation and thermal dependency study of the absorption lines as a co‐product of Raman spectroscopy study in SmFe3 (BO3)4 ferroborate. Raman spectra of the ferroborate were studied in a wide temperature range (T = 10÷300 K). Temperature‐dependent absorption lines sensitive to the magnetic phase transition have been observed in Raman spectra at two spectral ranges.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Morozova T. P.
Заглавие : Temperature dependence of the fine structure of the C and E absorption bands in RbMnF3 below the Neel temperature
Разночтения заглавия :авие SCOPUS: Temperature dependence of the fine structure of the C and E absorption bands in RbMnF3 below the neel temperature
Место публикации : Phys. Solid State: SPRINGER, 2006. - Vol. 48, Is. 2. - P283-290. - ISSN 1063-7834, DOI 10.1134/S1063783406020156
Примечания : Cited References: 24
Предметные рубрики: PEROVSKITE FLUORIDES
VIBRONIC SPECTRA
CRYSTALS
MNF2
INTENSITY
DICHROISM
STATES
Аннотация: The variation in the parameters (width, position, intensity) of the fine structure lines in the C[(6)A(1g) - (4)A(1g), E-4(g)((4)G)] and E[(6)A(1g) - E-4(g)(D-4)] bands in RbMnF3 with temperature is studied in the temperature range 10-70 K. In the C band, two narrow ( 6 cm(-1)) lines are are distinguished at distances of 77 and 80 cm(-1) from the exciton line at T
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikova S. V., Grankina V. A., Bandarenko G. V., Gorev M. V.
Заглавие : T-x phase diagram of solid solutions RbxK1-xLiSO4
Коллективы : International Seminar on Physics of Ferroelastics
Место публикации : Izv. Akad. Nauk Ser. Fiz. - 1998. - Vol. 62, Is. 8. - P.1537-1540. - ISSN 1026-3489
Примечания : Cited References: 4
Предметные рубрики: TRANSITIONS
CRYSTALS
WOS
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Gavrilova T. A., Isaenko L. I., Kesler V. G., Molokeev M. S., Zhurkov S. A.
Заглавие : Synthesis and structural properties of cubic G0-Rb2KMoO3F3 oxyfluoride
Место публикации : Ceram. Int.: Elsevier, 2012. - Vol. 38, Is. 3. - P.2455-2459. - ISSN 0272-8842, DOI 10.1016/j.ceramint.2011.11.013
Примечания : Cited References: 23. - This study was partly supported by RFBR (Grant 09-02-00062) and SB RAS (Grant 34).
Предметные рубрики: PHASE-TRANSITIONS
FERROELECTRIC K3WO3F3
(NH4)(3)MOO3F3
TEMPERATURE
PEROVSKITE
ELPASOLITE
CRYSTALS
BEHAVIOR
High temperature
Melt solidification
Micromorphologies
Melt solidification
Microstructure-final
Oxyfluorides
Space Groups
Oxyfluorides
X ray methods
Ключевые слова (''Своб.индексиров.''): powders: solid state reaction--microstructure-final--x-ray methods--alkali oxides--halides
Аннотация: High-temperature G0 polymorph of Rb2KMoO3F3 has been prepared by melt solidification. Micromorphology and chemical properties of the final product were evaluated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The elpasolite-related crystal structure of G0-Rb2KMoO3F3 has been refined by Rietveld method at T = 298 K (space group Fm-3m, a = 8.92446(8) Å, V = 710.76(1) Å3; RB = 3.55%). Ferroelectric G1-Rb2KMoO3F3 polymorph, earlier reported at T˂328 K, is not found at T = 298 K.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Raevski I. P., Titov V. V., Malitskaya M. A., Eremin E. V., Kubrin S. P., Blazhevich A. V., Chen H., Chou C.-C., Raevskaya S. I., Zakharchenko I. N., Sarychev D. A., Shevtsova S. I.
Заглавие : Studies of ferroelectric and magnetic phase transitions in multiferroic PbFe0.5Ta0.5O3-PbTiO3 solid solution ceramics
Коллективы : Russian Foundation for Basic Research (RFBR) [12-08-00887_a]; Research Committee of the University of Macau
Место публикации : J. Mater. Sci.: Springer, 2014. - Vol. 49, Is. 18. - P.6459-6466. - ISSN 0022-2461, DOI 10.1007/s10853-014-8376-z. - ISSN 1573-4803
Примечания : Cited References: 35. - This study is partially supported by the Russian Foundation for Basic Research (RFBR) Project 12-08-00887_a and Research Committee of the University of Macau under Research and Development Grant for Chair Professor.
Предметные рубрики: MOSSBAUER
CRYSTALS
BEHAVIOR
NIOBATE
Аннотация: Dielectric, X-ray, Mossbauer and magnetization studies of (1 − x)PbFe0.5Ta0.5O3–(x)PbTiO3 ceramics with 0 ≤ x ≤ 0.3 have been carried out to determine the compositional evolution of ferroelectric and magnetic phase transition temperatures. Addition of PbTiO3 to PbFe0.5Ta0.5O3 increases the temperature T m of the dielectric permittivity maximum, decreases both the diffusion of this maximum and its frequency dependence. However, the Curie–Weiss temperature exceeds T m for all the compositions studied, indicating that the phase transition still remains diffused. Dilution of the (Fe, Ta)-sublattice by Ti lowers the Neel temperature T N but above a certain compositional threshold (x ≈ 0.1) fast lowering of T N stops and a new magnetic state stable in a rather wide compositional range appears. Large difference between the zero-field-cooled (ZFC) and FC magnetization–temperature curves as well as between the temperatures of magnetic phase transition determined from Mossbauer and magnetization studies for compositions with x 0.1 implies that this state is a spin-glass phase.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Misyul S. V., Molokeev M. S., Voronov V. N.
Заглавие : Structures of distorted phases and critical and noncritical atomic displacements of elpasolite Rb2KInF6 during phase transitions
Коллективы : President of the Russian Federation [NSh-1011.2008.2]
Место публикации : Phys. Solid State. - 2009. - Vol. 51, Is. 12. - P.2505-2512. - ISSN 1063-7834, DOI 10.1134/S1063783409120130
Примечания : Cited References: 21. - This work was supported by the Council on Grants from the President of the Russian Federation, grant NSh-1011.2008.2.
Предметные рубрики: CRYSTALS
Аннотация: The structures of all three phases of the Rb2KInF6 crystal have been determined from the experimental X-ray diffraction data for the powder sample. The refinement of the profile and structural parameters has been carried out by the technique implemented in the DDM program, which minimizes the differences between the derivatives of the calculated and measured X-ray intensities over the entire profile of the X-ray diffraction pattern. The results obtained have been discussed using the group-theoretical analysis of the complete order-parameter condensate, which takes into account the critical and noncritical atomic displacements and permits the interpretation of the experimental data obtained previously. It has been reliably established that the sequence of changes in the symmetry during phase transitions in Rb2KInF6 can be represented as Fm (3) over barm 11-9(Gamma(+)(4))- 0, 0, phi I114/m 11-9(Gamma(+)(4)) circle plus 10-3(Chi(+)(3))- (psi, phi, phi) P12(1)/n1.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Safonov I. N., Misyul' S. V., Molokeev M. S., Ivliev M. P.
Заглавие : Structural transformations and phenomenological description of the formation of phase states in elpasolites Cs2RbDyF6 and Rb2KB′F6 (B′ = Ho, Dy, Tb)
Коллективы : Ministry of Education and Science of the Russian Federation [3.2534.2014/K]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 3. - P.491-498. - ISSN 1063, DOI 10.1134/S1063783415030282. - ISSN 10906460(eISSN)
Примечания : Cited References:20. - This study was supported by the Ministry of Education and Science of the Russian Federation within the framework of the State Task for the Russian Siberian Federal University for Implementation of Scientific Research Work in 2014 (assignment no. 3.2534.2014/K).
Предметные рубрики: TRANSITIONS
CRYSTALS
Аннотация: The structures of the cubic and monoclinic phases of an Rb2KHoF6 crystal from a series of elpasolites Rb2KB′F6 (B′ = Ho, Dy, Tb), which undergoes a trigger phase transition, have been investigated using X-ray powder diffraction. The critical and noncritical displacements of atoms in the Rb2KHoF6 structure have been determined from the group-theoretical analysis of the complete condensate of order parameters. It has been reliably established that a change in the symmetry due to the phase transition in this crystal can be represented in the form Fmˉ3m11−9(Γ+4)⊕10−3(X+3)(ϕ,ϕ,ψ)P121/n1Fm\bar 3m\frac{{11 - 9(\Gamma _4. + ) \oplus 10 - 3(X_3. + )}} {{(\phi ,\phi ,\psi )}}P12_1 /n1 . A phenomenological analysis of the conditions responsible for the formation of phase states upon the phase transitions in elpasolites Cs2RbDyF6 and Rb2KB′F6 (B′ = Ho, Dy, Tb) has been carried out. Taking into account the structural data and using the phenomenological theory, it has been found that the main factor determining the formation of phase states in these and related crystals is the instability of the elpasolite structure with respect to rotational distortions of two types. It has been shown that an important role in the formation of a sequence of structural transformations in these crystals is played by the interaction of rotational order parameters and displacements of the cation from the center of a cuboctahedral hole.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zinenko V. I., Sofronova S. N.
Заглавие : Statistical mechanics of cation ordering in PbSc1/2Ta1/2O3 and PbSc1/2Nb1/2O3 solid solutions
Разночтения заглавия :авие SCOPUS: Statistical mechanics of cation ordering in PbSc1/2Ta 1/2O3 and PbSc1/2Nb1/2O3 solid solutions
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 12. - P2309-2314. - ISSN 1063-7834, DOI 10.1134/1.2142896
Примечания : Cited References: 17
Предметные рубрики: PHASE-TRANSITION
PEROVSKITE
DISORDER
FERROELECTRICS
CRYSTALS
MODEL
Аннотация: A model Hamiltonian for B cation ordering (Sc-Nb(Ta)) in PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3 solid solutions is constructed. The parameters of the model Hamiltonian are determined from the ab initio calculation within the ionic crystal model with allowance made for the deformability and the dipole and quadrupole polarizabilities of the ions. The temperatures of the phase transition due to the ordering of the B cations are calculated by the Monte Carlo method in the mean-field and cluster approximations. The phase transition temperatures calculated by the Monte Carlo method (1920 K for PbSc1/2Ta1/2O3 and 1810 K for PbSc1/2Nb1/2O3) are consistent with the experimental data (1770 and 1450 K, respectively). The thermodynamic properties of the cation ordering are investigated using the Monte Carlo method. (c) 2005 Pleiades Publishing, Inc.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Klimin S. A., Kashchenko M. A., Bezmaternykh L. N.
Заглавие : Spin-phonon and electron-phonon interactions in multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 evidenced by IR reflection spectroscopy
Коллективы : Russian Science Foundation [14-12-01033]; Swiss National Science Foundation (SNSF); Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva
Место публикации : J. Low Temp. Phys.: Springer/Plenum Publishers, 2016. - Vol. 185, Is. 5-6. - P.538-543. - ISSN 0022-2291, DOI 10.1007/s10909-016-1597-6. - ISSN 1573-7357(eISSN)
Примечания : Cited References:19. - The authors thank Alexey Kuzmenko and Marina Popova for fruitful discussions. This paper was supported by the Russian Science Foundation under Grant No. 14-12-01033, by the Swiss National Science Foundation (SNSF), and by the Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva.
Предметные рубрики: PHASE-TRANSITIONS
GdFe3(BO3)4
CRYSTALS
SPECTRUM
Ключевые слова (''Своб.индексиров.''): multiferroics--ir-active phonons--spin-phonon interaction--coupled--electron-phonon mode
Аннотация: We study temperature-dependent polarized reflection spectra of multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 single crystals. Signatures of spin–lattice interactions in both compounds and of a formation of the electron–phonon coupled mode in TbFe3(BO3)4 are discussed.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chukalina E. P., Bezmaternykh L. N.
Заглавие : Spectroscopic study of magnetic phase transitions in NdxGd1-xFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Spectroscopic study of magnetic phase transitions in NdxGd 1 - XFe3(BO3)4
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47: 12th Feofilov Workshop on Spectroscopy of Crystal Activated by Rare-Earth and Transition-Metal Ions (SEP 22-25, 2004, Yekaterinburg, RUSSIA), Is. 8. - P1528-1531. - ISSN 1063-7834, DOI 10.1134/1.2014507
Примечания : Cited References: 10
Предметные рубрики: CRYSTALS
ND
Аннотация: Magnetic ordering and spin reorientation in iron borates NdxGd1 - xFe3(BO3)(4) (x = 0.01, 0.04, 0.25, 1.0) are studied using a rare-earth spectroscopic probe. (c) 2005 Pleiades Publishing, Inc.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Boldyrev K. N., Klimin S. A., Stanislavchuk T. N., Sirenko A. A., Bezmaternykh L. N.
Заглавие : Spectral signatures of spin-phonon and electron-phonon interactions in multiferroic iron borates
Коллективы : Moscow International Symposium on Magnetism , Russian Science Foundation [14-12-01033], U.S. Department of Energy [DE-FG02-07ER46382, DE-AC02-98CH10886]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2015. - Vol. 383. - P.250-254. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2014.10.095. - ISSN 1873-4766 (eISSN)
Примечания : Cited References:32. - This work was supported by the Russian Science Foundation (Grant no. 14-12-01033). Experiments at U4-IR beamline NSLS-BNL (T.N.S. and A.A.S.) were performed under Contract no. DE-FG02-07ER46382 from the U.S. Department of Energy. The National Synchrotron Light Source is operated as a User Facility for the U.S. Department of Energy under Contract no. DE-AC02-98CH10886. M.N.P. thanks B.Z. Malkin for helpful discussions.
Предметные рубрики: SMFE3(BO3)4
SPECTROSCOPY
CRYSTALS
SM
Ключевые слова (''Своб.индексиров.''): rare-earth iron borates--spin phonon interactions--electron phonon coupling--optical spectroscopy
Аннотация: High-resolution far-infrared reflection and polarized ellipsometry, as well as Raman scattering temperature-dependent measurements are used to study spin-phonon and electron-phonon interactions in rare-earth (RE) iron borates with the R32 structure of a natural mineral huntite, namely, in RFe3(BO3)4 with R=Pr, Nd, and Sm. Pronounced peculiarities in the ω(T) dependences at the Néel temperature TN≈32 K are observed for all the compounds studied and the origin of these peculiarities is discussed. A coupling between lattice phonons and crystal-field excitations of a RE ion manifests itself by a renormalization of frequencies and intensities of coupled modes. Modeling of the spectra has revealed the value of about 15 cm−1 for the electron–phonon coupling constant in PrFe3(BO3)4.Высокоразрешающая эллипсометрия дальнего инфракрасного отражения и поляризованный света, а также температурнозависимые измерения комбинационного рассеяния используются для изучения спин-фононных и электрон-фононных взаимодействий в редкоземельных (RE) боратах железа со структурой R32 природного минерала хантита , а именно, в RFe3 (BO3) 4 с R = Pr, Nd, и Sm. Выраженные особенности ω (T) зависимостей при температуре Нееля TN ≈32 K наблюдаются для всех исследованных соединений и происхождение этих особенностей обсуждается.Связь между фононами решетки и возбуждениями кристаллического поля РЗ иона проявляется себя перенормализации частоты и интенсивности связанных мод. Моделирование спектров показал значение около 15cm-1 для константы электрон-фононной связи в PrFe3 (BO3) 4.
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