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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vtyurin A. N., Krylov A. S., Goryainov S. V., Krylova S. N., Oreshonkov A. S., Voronov V. N.
Заглавие : A raman study of hydrostatic pressure induced phase transitions in Rb2KInF6 crystals
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 5. - P.934-936. - ISSN 1063-7834, DOI 10.1134/S1063783412050472
Примечания : Cited References: 16. - This study was supported by the Russian Foundation for Basic Research (project nos. 11-02-98002-r_sibir' and 09-02-00062), the Siberian Branch of the Russian Academy of Sciences (integration project no. 101), and the Council on Grants from the President of the Russian Federation (grant no. HSh-4645.2010.2).
Предметные рубрики: LATTICE-DYNAMICS
ELPASOLITES
SPECTRA
Аннотация: The Raman spectra of the elpasolite (Rb2KInF6) crystal have been studied in the pressure range from 0 to 5.3 GPa at a temperature of 295 K. A phase transition at a pressure of approximately 0.9 GPa has been found. An analysis of the variations in the spectral parameters has led to the conclusion that the phase transition to a distorted phase is accompanied by the doubling of the volume of the primitive cell of the initial cubic phase. Numerical calculations of the lattice dynamics in the Rb2KInF6 crystal have been performed. The numerical simulation has established that the phase transition at a pressure of 0.9 GPa is associated with condensation of the F (lg) mode. A probable high-pressure phase is the phase with space group C2/m.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gorev M. V., Bogdanov E. V., Flerov I. N., Voronov V. N., Laptev Y. V.
Заглавие : Barocaloric effect and phase transitions in oxyfluorides Rb2KTiOF5 and (NH4)2NbO5F
Коллективы : Воронежский государственный технический университет, Российская академия наук, International Seminar on ferroelastic physics (6; 2009 ; Sept. 22-25; Voronezh), Международный семинар по физике сегнетоэластиков (6(11); 2009 ; 22-25 сент.; Воронеж)
Место публикации : The 6th International Seminar on Ferroelastic Physics: abstract book. - Voronezh, 2009. - P.22
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Bogdanov E. V., Voronov V. N., Laptash N. M.
Заглавие : Barocaloric effect near the structural phase transition in the Rb2KTiOF5 oxyfluoride
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 2. - P377-383. - ISSN 1063-7834, DOI 10.1134/S1063783410020253
Примечания : Cited References: 21. - This study was supported by the Siberian Branch of the Russian Academy of Sciences (Interdisciplinary Integration Project no. 34), the Russian Foundation for Basic Research and the Krasnoyarsk Regional Scientific Foundation within the framework of the "Sibir'" Project (project no. 09-02-98001), and the Council on Grants from the President of the Russian Federation for Support of the Leading Scientific Schools of the Russian Federation (grant no. NSh-1011.2008.2).
Предметные рубрики: HEAT-CAPACITY
PRESSURE
Аннотация: The barocaloric effect (BCE) in the oxyfluoride Rb2KTiOF5 has been studied in the vicinity of the structural phase transition at a temperature of 215 K in the pressure range 0-0.6 GPa. It has been established that the extensive and intensive barocaloric effects are Delta S-BCE similar to -46 J/kg K and Delta T (AD) similar to 18 K, respectively, over a wide temperature range 215-280 K. The studies performed have shown that the external hydrostatic pressure is a very effective tool for changing the entropy and temperature of the crystals which undergo structural phase transitions accompanied by a large change in the entropy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrova I. P., Ivanov Y. N., Bondarev V. S., Sukhovskii A. A., Voronov V. N.
Заглавие : Calorimetric and 23Na MAS NMR study of the phase diagram of NANB1_xTAxO3 solid solutions
Место публикации : Functional Materials. - 2010. - Vol. 17, Is. 1. - P.18-23. - ISSN 1027-5495
Аннотация: The heat capacity of NaNb1_xTaxO3 solid solutions was measured in the temperature range 100 to 770 K. The step-like change of phase transition temperature is observed in the T-x phase diagram at concentration x = 0.55. The obtained results are in a good agreement with the data of dielectric studies. The 23Na MAS NMR spectra were obtained at Larmor frequency 79.35 MHz using a Bruker AVANCE 300 spectrometer. The quadru-polar coupling constant, (CQ=e2qQ/h) and asymmetry parameter (n) were determined by computer fitting of the NMR line shape using the DMFit software. The found parameters show that solid solution structure is NaTa03-based at 0.7<X ?1 and NaNbO3-based at 0?x?0.5. The spectra in the intermediate region (0.5<x?0.7) can be described at a reasonable accuracy when assuming the coexistence of NaTaO3 and NaNbO3 structures. В© 2010 - STC "Institute for Single Crystals".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Molokeev M. S., Misyul S. V., Krylova S. N., Oreshonkov A. S., Ivanenko A. A., Zykova V. A., Ivanov Y. N., Sukhovsky A. A., Voronov V. N., Safonov I. N., Vtyurin A. N.
Заглавие : Crystal structure and phase transitions of a layered perovskite-like CsScF4 crystal
Коллективы : Russian Foundation for Basic Research [16-02-00102]
Место публикации : CrystEngComm: Royal Society of Chemistry, 2016. - Vol. 18, Is. 43. - P.8472-8486. - ISSN 1466-8033, DOI 10.1039/c6ce01144f
Примечания : Cited References:47. - The authors are grateful to Prof. I. N. Flerov for valuable support and useful discussions. This work was partly supported by the Russian Foundation for Basic Research, Project 16-02-00102. The research is partially conducted within the framework of the state task of the Ministry of Education and Science of the Russian Federation for Siberian Federal University on R&D performance in 2014 (Task 3.2534.2014/K). X-ray data from powders, Raman NMR, and IR spectra were obtained with use the analytical equipment of Krasnoyarsk Center of collective use SB RAS.
Предметные рубрики: NEGATIVE THERMAL-EXPANSION
RAMAN-SCATTERING
LATTICE-DYNAMICS
Аннотация: This work is devoted to the complex research on temperature phase transitions in a CsScF4 crystal. The crystal structure was solved and refined at different temperatures by using the Rietveld method. Structural phase transitions were investigated by using the following spectroscopic methods, some of them for the first time: Brillouin spectroscopy, Raman spectroscopy, IR absorption spectroscopy and NMR. The symmetry analysis of the Brillouin zone center of all phases is presented. The vibrational spectra of the crystal in three phases have been calculated. The structural phase transition mechanism was determined. The transitions at T-1 = 475 K and T-2 = 317.5 K are of displacement type. The Raman soft modes have been associated with rotations of the ScF6 octahedral group.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Molokeev M. S., Vasiliev A. D., Voronov V. N., Laptash N. M., Aleksandrov K. S., Flerov I. N., Tressaud A.
Заглавие : Crystal structures of room and low temperature phases in RBKTiOF5 and RB2KFeF6
Коллективы : "Advanced inorganic fluorides", International Siberian workshop
Место публикации : Advanced inorganic fluorides: the Third International Siberian workshop Intersibfluorine - 2008, September 01-06, 2008, Vladivostok, Russia : proceedings of ISIF-2008. - 2008. - С. 69-70. - ISBN 978-5-98128-036-8
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Tressaud A., Aleksandrov K. S., Couzi M., Gorev M. V., Grannec J., Melnikova S. V., Chaminade J. P., Misul S. V., Voronov V. N.
Заглавие : Effect of B3+ ion size on the phase transitions in Rb2KB3+F6 elpasolites series
Место публикации : Ferroelectrics: Gordon breach SCI publ LTD, 1991. - Vol. 124, Is. 1. - P.309-314. - ISSN 0015-0193, DOI 10.1080/00150199108209457
Аннотация: The physical properties of Rb2KScF6 crystal characterized by the medium size of B3+ atom in Rb2KB3+F6 series are studied. The two successive phase transitions from cubic into tetragonal and then into monoclinic phases are found. The results are discussed in view of the influence of B3+ atom size on structural transformations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iomin L. M., Moskalev A. K., Voronov V. N., Buznik V. M.
Заглавие : Electric-field gradient on Cl-35 nuclei in PbFCl
Место публикации : Izvestiya Akademii Nauk SSSR Seriya Fizicheskaya. - 1981. - Vol. 45, Is. 9. - P.1775-1777. - ISSN 0367-6765
Примечания : Cited References: 9
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronov V. N., Petrakovskaya E. A.
Заглавие : EPR investigation of local paramagnetic centers in perovskite-like crystals
Место публикации : Phys. Solid State. - 2013. - Vol. 55, Is. 4. - P.730-736. - DOI 10.1134/S1063783413040367
Аннотация: In ScF3 single crystals (pure and doped) as well as in Rb2KScF6 and Rb2KDyF6 crystals with a perovskite-like structure, point nanodefects (vacancy in place of trivalent cations) have been found and studied. Electron paramagnetic resonance has been used to investigate local paramagnetic centers that are not detected using X-ray diffraction. The angular dependence of the spectra indicates a local distortion of the cubic symmetry of the crystals. An additional hyperfine structure in the observed spectra is due to the delocalization of electrons over six F− ions forming the first coordination polyhedron around the vacancy. The crystals studied are characterized by a high electron mobility and a high electron velocity, which depends on the impurity. The high mobility of electrons of the cation center can be indirectly responsible for the structural phase transition occurring in the ScF3 crystal under uniaxial pressure.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Antuzevics A., Rogulis U., Fedotovs A., Berzins D., Voronov V. N., Purans J.
Заглавие : EPR study of Gd3+ local structure in ScF3 crystal with negative thermal expansion coefficient
Место публикации : Phys. Scr.: IOP Publishing, 2015. - Vol. 90, Is. 11. - Ст.115801. - ISSN 0031-8949, DOI 10.1088/0031-8949/90/11/115801
Примечания : Cited References: 32. - We are grateful to Professor S Ovchinnikov for providing ScFINF3/INF samples. This work was supported by L-KC-11-0005 project Nr.KC/2.1.2.1.1/10/01/006,5.3
Предметные рубрики: ELECTRON-PARAMAGNETIC-RESONANCE
SPIN-HAMILTONIAN PARAMETERS
SINGLE-CRYSTALS
SUPERPOSITION-MODEL
CENTERS
SPECTRA
PHASE
TEMPERATURE
SIMULATION
Ключевые слова (''Своб.индексиров.''): electron paramagnetic resonance--gd3+--scf3--negative thermal expansion
Аннотация: Zero field splitting (ZFS) of Gd3+ impurity in ScF3 is studied by electron paramagnetic resonance at 77 and 295 K. ZFS parameter b4 values obtained from angular dependence simulations show that regardless of negative thermal expansion in ScF3 temperature dependence of |b4| is similar to other cubic fluoroperovskites. Our analysis of ZFS parameters indicates that the local structure of Gd3+ centres expands positively with temperature. © 2015 The Royal Swedish Academy of Sciences.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronov V. N., Petrakovskaya E. A., Alexandrovskaya A. V.
Заглавие : EPR Study of Solid Solutions Based on the Compound ScF3
Место публикации : Functional Materials. - 2010. - Vol. 17, Is. 3. - С. 324-328
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronov V. N., Petrakovskaya E. A., Alexandrovich A. A.
Заглавие : ESR study of ScF3 crystals and the crystals of ScF3 based solid solutions
Место публикации : Functional Materials. - 2010. - Vol. 17, Is. 3. - P.324-328. - ISSN 10275495
Аннотация: The ScF3 crystals belong to the perovskite family but, in contrast to other fluorides of that class, exhibit cubic symmetry. The ESR study of those crystals has shown that the spectra of impurity-free crystals as well as those containing Ga, Mg, Sb, Al, Fe include lines that can be ascribed to the local defects of the crystal structure. Those defects have been evidenced most reliably in ScF3 single crystals with Ga and Fe impurities as well in the impurity-free ones. In all the cases, the spectra show the presence of defects related to six fluorine atoms. This fact is most pronounced in the crystals with Fe impurity. A local distortion of cubic symmetry has been revealed unambiguously at the defect center sites. The letter seem to be fluorine octahedrons. В© 2010 STC "Institute for Scientific Crystals".
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Anistratov A. T., Melnikova S. V., KLEVTSOV P. V., KRUGLIK A. I., VORONOV V. N.
Заглавие : Ferroelectric phase-transitions in CSLIMOO4 single-crystals
Место публикации : Phys. Status Solidi A. - 1981. - Vol. 67, Is. 2. - P.377-380. - ISSN 0031-8965, DOI 10.1002/pssa.2210670203
Примечания : Cited References: 3
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., ANISTRATOV A. T., Melnikova S. V., Klevtsov P. V., Kruglik A. I., Voronov V. N.
Заглавие : Ferroelectricity in caesium lithium molybdate CsLiMoO4 and related crystals CsLiWO4 and RbLiMoO4
Коллективы : International meeting on ferroelectricity
Место публикации : International meeting on ferroelectricity (5 ; 1981 ; 17-21 Aug. ; Universal Park, USA). Ferroelectrics. - 1981. - Vol. 36, Is. 1. - P.399-402. - ISSN 0015-0193, DOI 10.1080/00150198108218138
Ключевые слова (''Своб.индексиров.''): cesium compounds--rubidium compounds--cesium lithium molybdate--cesium lithium tungstate--phase transitions--rubidium lithium molybdate--ferroelectric materials
Аннотация: Successive ferroelectric phase transitions were discovered in CsLiMoO//4, CsLiWO//4 and RbLiMoO//4 single crystals. Strong elastic and no dielectric anomalies were found with temperature lowering in the initial cubic phases. The phase transitions are qualitatively described as pseudoproper ferroelectric ones.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fokina V. D., Flerov I. N., Molokeev M. S., Pogoreltsev E. I., Bogdanov E. V., Krylov A. S., Bovina A. F., Voronov V. N., Laptash N. M.
Заглавие : Heat capacity, p-T phase diagram, and structure of Rb2KTiOF5
Коллективы :
Разночтения заглавия :авие SCOPUS: Heat capacity, p-T phase diagram, and structure of Rb2KTiOF 5
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 11. - P2175-2183. - ISSN 1063-7834, DOI 10.1134/S1063783408110280
Примечания : Cited References: 23. - This work was supported by the Russian Foundation for Basic Research, project no. 06-02-16102.
Предметные рубрики: ELECTRON-DIFFRACTION
TRANSITIONS
OXYFLUORIDES
(NH4)(2)KWO3F3
TEMPERATURE
XRD
CS
Ключевые слова (''Своб.индексиров.''): 61--50--ks--65--40--ba--65--40--gd--78--30--hv--81--30--dz
Аннотация: Elpasolite Rb2KTiOF5 (space group, Fm was synthesized using a solid-phase reaction method. The temperature dependences of the heat capacity, the unit cell parameters, the structure, the permittivity, the response to an external pressure, and the Raman spectra were studied. A nonferroelectric phase transition was revealed at T (0) = 215 K; the transition is accompanied by a tetragonal distortion of the unit cell (space group I4/m, Z = 10) and a change in the entropy (S (0) = Rln8), which is anomalously large for perovskite-like oxyfluorides with atomic cations. The specific features of the mechanism of structure distortion are discussed in combination with the previous experimental data obtained for cryolite (NH4)(3)TiOF5 and elpasolite Rb2KGaF6.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vtyurin A. N., Krylov A. S., Krylova S. N., Goryainov S. V., Voronov V. N., Oreshonkov A. S.
Заглавие : Hydrostatic pressure-induced phase transitions in Rb2KInF 6 and Rb2KScF6 crystals : Raman spectra and lattice dynamics simulations
Коллективы : International Symposium on Ferroic Domains and Micro- to Nanoscopic Structures, Russia/CIS/Baltic/Japan Symposium on Ferroelectricity
Место публикации : Ferroelectrics: Taylor & Francis, 2012. - Vol. 440. - P.100-104. - ISSN 0015-0193, DOI 10.1080/00150193.2012.743375
Примечания : Cited References: 10. - This work has been financially supported by grants: Russian Foundation for Basic Research (project nos. 11-02-98002-r_sibir' and 09-02-00062), the Siberian Branch of the Russian Academy of Sciences (integration project no. 101), and the Council on Grants from the President of the Russian Federation (grant no. HSh-4645.2010.2).
Ключевые слова (''Своб.индексиров.''): rb2kinf6--rb2kscf6--phase transitions--raman scattering--lattice dynamics
Аннотация: Raman scattering spectra of Rb2KInF6 and Rb2KScF6 crystals have been studied under hydrostatic pressure up to 5.3 GPa at room temperature. Results are interpreted within semiempirical simulations of the lattice dynamics. Observed phase transitions both in Rb2KInF6 and Rb2KScF6 crystals are associated with condensation of soft F-1g phonon mode. High-pressure phases for both crystals are supposed to be of C2/m space group.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Handunkanda, Sahan U., Curry, Erin B., Voronov V. N., Hancock, Jason N.
Заглавие : Infrared lattice dynamics in negative thermal expansion material in single-crystal ScF3
Место публикации : J. Phys.: Condens. Matter. - 2020. - Vol. 32, Is. 3. - Ст.035403. - ISSN 0953-8984, DOI 10.1088/1361-648X/ab4955. - ISSN 1361-648X(eISSN)
Примечания : Cited References: 49. - Work at the University of Connecticut is supported by National Science Foundation Award No. DMR-1506825
Предметные рубрики: LONGITUDINAL-OPTIC MODES
TEMPERATURE-DEPENDENCE
ABSORPTION
Аннотация: Simple cubic 'open' perovskite ScF3 stands out among trifluoride materials in its large, isotropic negative thermal expansion (NTE), but also its proximity of its zero-temperature state to a structural phase transition. Here we report a temperature- and frequency-dependent lattice dynamical study of Brillouin zone center lattice excitations of single crystals of ScF3 using infrared reflectivity measurements. In addition to quantifying the mode strengths and energies in single crystals of this interesting material, we also find strong evidence for multiphonon absorption processes which excite the zone-edge incipient soft modes associated with NTE and the structural quantum phase transition. In this way, we identify an optically-allowed pathway to excite soft modes provides a means to athermally populate modes associated with NTE in ScF3.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Handunkanda S. U., Curry E. B., Voronov V. N., Said, Ayman H., Guzman-Verri G. G., Brierley R. T., Littlewood P. B., Hancock J. N.
Заглавие : Large isotropic negative thermal expansion above a structural quantum phase transition
Место публикации : Phys. Rev. B: American Physical Society, 2015. - Vol. 92, Is. 13. - Ст.134101. - ISSN 1098, DOI 10.1103/PhysRevB.92.134101. - ISSN 1550235X(eISSN)
Примечания : Cited References:35. - The authors also acknowledge the valuable conversations with Joe Budnick and Gabe Aeppli. Work at the University of Connecticut is supported by National Science Foundation Award No. DMR-1506825. Work at the University of Costa Rica is supported by Vicerrectoria de Investigacion under Project No. 816-B5-220, and work at Argonne National Laboratory is supported by the US Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-06CH11357. R.T.B. acknowledges support from the Yale Prize Postdoctoral Fellowship. The construction of HERIX was partially supported by the NSF under Grant No. DMR-0115852.
Предметные рубрики: SCF3 CRYSTAL
CUBIC SCF3
DYNAMICS
SCATTERING
SRTIO3
Аннотация: Perovskite structured materials contain myriad tunable ordered phases of electronic and magnetic origin with proven technological importance and strong promise for a variety of energy solutions. An always-contributing influence beneath these cooperative and competing interactions is the lattice, whose physics may be obscured in complex perovskites by the many coupled degrees of freedom, which makes these systems interesting. Here, we report signatures of an approach to a quantum phase transition very near the ground state of the nonmagnetic, ionic insulating, simple cubic perovskite material ScF3, and show that its physical properties are strongly effected as much as 100 K above the putative transition. Spatial and temporal correlations in the high-symmetry cubic phase determined using energy- and momentum-resolved inelastic x-ray scattering as well as x-ray diffraction reveal that soft mode, central peak, and thermal expansion phenomena are all strongly influenced by the transition.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Voronov V. N., Vtyurin A. N., Goryainov S. V., Zamkova N. G., Zinenko V. I., Krylov A. S.
Заглавие : Lattice dynamics and hydrostatic-pressure-induced phase transitions in ScF3
Место публикации : J. Exp. Theor. Phys.: American Institute of Physics, 2002. - Vol. 94, Is. 5. - P.977-984. - ISSN 1063-7761, DOI 10.1134/1.1484991
Примечания : Cited References: 20
Предметные рубрики: RAMAN-SPECTROSCOPY
CRYSTALS
SCATTERING
Аннотация: New phase transitions induced by hydrostatic pressure in a cubic (under standard conditions) ScF3 crystal are discovered by the methods of polarization microscopy and Raman scattering. The space groups R (3) over barc for Z = 2 and Pnma for Z = 4 are proposed for the high-pressure phases. A nonempirical computation of the lattice dynamics of the crystal is carried out. It is shown that, under normal pressure, the cubic phase is stable down to T = 0 K, while the application of a hydrostatic pressure gives rise to a phonon branch in the vibrational spectrum (between points R and M of the Brillouin zone) with negative values of squares of frequencies. The condensation of soft mode R-5 at the boundary point of the Brillouin zone leads to rhombohedral distortion of the cubic structure with the unit cell volume doubling. The calculated frequencies at q = 0 of the ScF3 lattice in the distorted rhombohedral phase are real-valued; the number and position of frequencies active in Raman scattering are in accord with the experimental values. (C) 2002 MAIK "Nauka/Interperiodica".
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vtyurin A. N., Goryainov S. V., Krylov A. S., Krylova S. N., Oreshonkov A. S., Voronov V. N.
Заглавие : Lattice dynamics and phase transitions in A2BMeF6 elpasolites studied by raman scattering
Коллективы : Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина , Объединенный международный симпозиум ISFD-11th-RCBJSF (11; 2012 ; авг. ; 20-24; Екатеринбург), International Symposium on Ferroic Domains and Micro- to Nanoscopic Structures (11; 2012 ; Aug. ; 20-24; Ekaterinburg), Международный симпозиум по доменам в ферроиках, микро- и нано-масштабным структурам (11; 2012 ; авг. ; 20-24; Екатеринбург), Russian-CIS-Baltic-Japan Symposium on Ferroelectricity (11; 2012 ; Aug. ; 20-24; Ekaterinburg), Российско-Японский и стран Балтии и СНГ симпозиум по сегнетоэлектричеству (11; 2012 ; авг. ; 20-24; Екатеринбург)
Место публикации : Proc. Joint Int. Symp: 11th Int. Symp. on Ferroic Domains and Micro-to Nanoscopic Structures and 11th - Russia/CIS/Baltic/Japan Symp. on Ferroelectricity. - 2012. - P.55
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