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A raman study of hydrostatic pressure induced phase transitions in Rb2KInF6 crystals / A. N. Vtyurin [et al.] // Phys. Solid State. - 2012. - Vol. 54, Is. 5. - P. 934-936, DOI 10.1134/S1063783412050472. - 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). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Публикация на русском языке Исследование фазовых переходов в кристалле Rb2KInF6, индуцированных гидростатическим давлением, методом комбинационного рассеяния света // Физика твердого тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54, Вып. 5. - С. 880-882. - ISSN 0367-3294

Держатели документа:
[Vtyurin, A. N.
Krylov, A. S.
Krylova, S. N.
Oreshonkov, A. S.
Voronov, V. N.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Goryainov, S. V.] Russian Acad Sci, Siberian Branch, Inst Mineral & Petrog, Novosibirsk 630090, Russia

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Goryainov, S. V.; Горяйнов, Сергей Владимирович; Krylova, S. N.; Крылова, Светлана Николаевна; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич
}
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Barocaloric effect and phase transitions in oxyfluorides Rb2KTiOF5 and (NH4)2NbO5F / M. V. Gorev, E. V. Bogdanov, I. N. Flerov [et al.] // The 6th International Seminar on Ferroelastic Physics : abstract book. - Voronezh, 2009. - P. 22

Материалы конференции

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Flerov, I. N.; Флёров, Игорь Николаевич; Voronov, V. N.; Воронов, Владимир Николаевич; Laptev, Y. V.; 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)
}
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Barocaloric effect near the structural phase transition in the Rb2KTiOF5 oxyfluoride / M. V. Gorev [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 2. - P. 377-383, DOI 10.1134/S1063783410020253. - 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). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Оригинал на русском языке Барокалорический эффект в области структурного фазового перехода в оксифториде Rb2KTiOF5 [Текст] / М. В. Горев [и др.] // Физика твердого тела. - Санкт-Петербург : Федеральное государственное унитарное предприятие "Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Российской академии наук "Издательство "Наука", 2010. - Т. 52 № 2. - С. 351-357

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

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Voronov, V. N.; Воронов, Владимир Николаевич; Laptash, N. M.
}
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Calorimetric and 23Na MAS NMR study of the phase diagram of NANB1_xTAxO3 solid solutions / I. P. Aleksandrova [et al.] // 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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Держатели документа:
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Ivanov, Y. N.; Иванов, Юрий Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Sukhovskii, A. A.; Суховский, Андрей Андреевич; Voronov, V. N.; Воронов, Владимир Николаевич
}
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    Crystal structure and phase transitions of a layered perovskite-like CsScF4 crystal / A. S. Krylov [et al.] // CrystEngComm. - 2016. - Vol. 18, Is. 43. - P. 8472-8486, DOI 10.1039/c6ce01144f. - 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. . - ISSN 1466-8033
   Перевод заглавия: Кристаллическая структура и фазовые переходы в слоистом перовскитоподобном кристалле CsScF4

РУБ Chemistry, Multidisciplinary + Crystallography
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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Держатели документа:
SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
SB RAS, Inst Automat & Electrometry, Novosibirsk 630090, Russia.

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Misyul, S. V.; Krylova, S. N.; Крылова, Светлана Николаевна; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Ivanenko, A. A.; Иваненко, Александр Анатольевич; Zykova, V. A.; Ivanov, Y. N.; Иванов, Юрий Николаевич; Sukhovsky, A. A.; Суховский, Андрей Андреевич; Voronov, V. N.; Воронов, Владимир Николаевич; Safonov, I. N.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Russian Foundation for Basic Research [16-02-00102]
}
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Crystal structures of room and low temperature phases in RBKTiOF5 and RB2KFeF6 / M. Molokeev, A. Vasiliev [et al.] // Advanced inorganic fluorides : the Third International Siberian workshop Intersibfluorine - 2008, September 01-06, 2008, Vladivostok, Russia : proceedings of ISIF-2008. - 2008. - P69-70 . - ISBN 978-5-98128-036-8

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Voronov, V. N.; Воронов, Владимир Николаевич; Laptash, N. M.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; "Advanced inorganic fluorides", International Siberian workshop(3 ; 2008 ; Sep. ; Vladivostok)
}
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Effect of B3+ ion size on the phase transitions in Rb2KB3+F6 elpasolites series / I. N. Flerov [et al.] // Ferroelectrics. - 1991. - Vol. 124, Is. 1. - P. 309-314, DOI 10.1080/00150199108209457 . - ISSN 0015-0193
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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Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Couzi, M.; Gorev, M. V.; Горев, Михаил Васильевич; Grannec, J.; Melnikova, S. V.; Мельникова, Светлана Владимировна; Chaminade, J. P.; Misul, S. V.; Мисюль, Сергей Валентинович; Voronov, V. N.; Воронов, Владимир Николаевич
}
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Electric-field gradient on Cl-35 nuclei in PbFCl / L. M. Iomin [et al.] // Izvestiya Akademii Nauk SSSR Seriya Fizicheskaya. - 1981. - Vol. 45, Is. 9. - P. 1775-1777. - Cited References: 9 . - ISSN 0367-6765

РУБ Physics, Multidisciplinary

WOS
Доп.точки доступа:
Iomin, L. M.; Moskalev, A. K.; Voronov, V. N.; Воронов, Владимир Николаевич; Buznik, V. M.
}
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    EPR study of Gd3+ local structure in ScF3 crystal with negative thermal expansion coefficient / A. Antuzevics [et al.] // Phys. Scr. - 2015. - Vol. 90, Is. 11. - Ст. 115801, DOI 10.1088/0031-8949/90/11/115801. - 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 . - ISSN 0031-8949
   Перевод заглавия: ЭПР исследование локальной структуры гадолиния в кристалле трехфтористого скандия с отрицательным коэффициентом теплового расширения

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRON-PARAMAGNETIC-RESONANCE
   SPIN-HAMILTONIAN PARAMETERS
   SINGLE-CRYSTALS
   SUPERPOSITION-MODEL
   CENTERS
   SPECTRA
   PHASE
   TEMPERATURE
   SIMULATION
Кл.слова (ненормированные):
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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Держатели документа:
Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, Riga, Latvia
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Antuzevics, A.; Rogulis, U.; Fedotovs, A.; Berzins, D.; Voronov, V. N.; Воронов, Владимир Николаевич; Purans, J.
}
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10.

EPR Study of Solid Solutions Based on the Compound ScF3 [Text] / Voronov V.N., Petrakovskaya E.A., Alexandrovskaya A.V. // Functional Materials. - 2010. - Vol. 17, Is. 3. - P324-328

Доп.точки доступа:
Voronov, V. N.; Воронов Владимир Николаевич; Petrakovskaya, E. A.; Петраковская Элеонора Анатольевна; Alexandrovskaya, A. V.
}
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11.

Ferroelectric phase-transitions in CSLIMOO4 single-crystals / K. S. Aleksandrov [et al.] // Phys. Status Solidi A. - 1981. - Vol. 67, Is. 2. - P. 377-380, DOI 10.1002/pssa.2210670203. - Cited References: 3 . - ISSN 0031-8965

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter

WOS
Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Anistratov, A. T.; Melnikova, S. V.; Мельникова, Светлана Владимировна; KLEVTSOV, P. V.; KRUGLIK, A. I.; VORONOV, V. N.; Воронов, Владимир Николаевич
}
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12.

Ferroelectricity in caesium lithium molybdate CsLiMoO4 and related crystals CsLiWO4 and RbLiMoO4 / K. S. Aleksandrov [и др.] // Ferroelectrics. - 1981. - Vol. 36, Is. 1. - P. 399-402, DOI 10.1080/00150198108218138 . - ISSN 0015-0193
Кл.слова (ненормированные):
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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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; ANISTRATOV, A. T.; Melnikova, S. V.; Мельникова, Светлана Владимировна; Klevtsov, P. V.; Kruglik, A. I.; Voronov, V. N.; Воронов, Владимир Николаевич; International meeting on ferroelectricity(5 ; 1981 ; 17-21 Aug. ; Universal Park, USA)
}
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13.

Heat capacity, p-T phase diagram, and structure of Rb2KTiOF5 / V. . Fokina [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 11. - P. 2175-2183, DOI 10.1134/S1063783408110280. - Cited References: 23. - This work was supported by the Russian Foundation for Basic Research, project no. 06-02-16102. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ELECTRON-DIFFRACTION
   TRANSITIONS
   OXYFLUORIDES
   (NH4)(2)KWO3F3
   TEMPERATURE
   XRD
   CS
Кл.слова (ненормированные):
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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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi 59, Krasnoyarsk, 660074, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Flerov, I. N.; Флёров, Игорь Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Krylov, A. S.; Крылов, Александр Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Voronov, V. N.; Воронов, Владимир Николаевич; Laptash, N. M.
}
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14.

Hydrostatic pressure-induced phase transitions in Rb2KInF 6 and Rb2KScF6 crystals : Raman spectra and lattice dynamics simulations / A. N. Vtyurin [et al.] // Ferroelectrics. - 2012. - Vol. 440. - P. 100-104, DOI 10.1080/00150193.2012.743375. - 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). . - ISSN 0015-0193
Кл.слова (ненормированные):
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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Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Goryainov, S. V.; Voronov, V. N.; Воронов, Владимир Николаевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; International Symposium on Ferroic Domains and Micro- to Nanoscopic Structures(11 ; 2012 ; Ekaterinburg); Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(11 ; 2012 ; Aug. ; 20-24 ; Ekaterinburg)
}
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15.

Infrared lattice dynamics in negative thermal expansion material in single-crystal ScF3 / S. U. Handunkanda, E. B. Curry, V. Voronov, J. N. Hancock // J. Phys.: Condens. Matter. - 2020. - Vol. 32, Is. 3. - Ст. 035403, DOI 10.1088/1361-648X/ab4955. - Cited References: 49. - Work at the University of Connecticut is supported by National Science Foundation Award No. DMR-1506825 . - ISSN 0953-8984. - ISSN 1361-648X

РУБ Physics, Condensed Matter
Рубрики:
LONGITUDINAL-OPTIC MODES
TEMPERATURE-DEPENDENCE
ABSORPTION
Кл.слова (ненормированные):
phonons -- infrared reflectivity -- negative thermal expansion -- optical properties
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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Держатели документа:
Univ Connecticut, Dept Phys, Storrs, CT 06269 USA.
Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 66006, Russia.

Доп.точки доступа:
Handunkanda, Sahan U.; Curry, Erin B.; Voronov, V. N.; Воронов, Владимир Николаевич; Hancock, Jason N.
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16.

Krylova, S. N.
The structural phase transitions in the elpasolites with ReF6 octahedral molecular group / S. N. Krylova, A. S. Krylov, A. N. Vtyurin, V. N. Voronov // Proceedings of XXVI International Conference on Raman Spectroscopy (ICORS 2018). - 2018. - P. 454

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Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Voronov, V. N.; Воронов, Владимир Николаевич; Крылова, Светлана Николаевна; International Conference on Raman Spectroscopy (26 ; 2018 ; авг. ; 26-31 ; Jeju, Korea)
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17.

    Large isotropic negative thermal expansion above a structural quantum phase transition / S. U. Handunkanda [et al.] // Phys. Rev. B. - 2015. - Vol. 92, Is. 13. - Ст. 134101, DOI 10.1103/PhysRevB.92.134101. - 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. . - ISSN 1098. - ISSN 1550-235X
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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Держатели документа:
Univ Connecticut, Dept Phys, Storrs, CT 06269 USA.
Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA.
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
Univ Costa Rica, Ctr Invest Ciencia & Ingn Mat, San Jose 2060, Costa Rica.
Univ Costa Rica, Escuela Fis, San Jose 2060, Costa Rica.
Argonne Natl Lab, Div Mat Sci, Argonne, IL 60349 USA.
Yale Univ, Dept Phys, New Haven, CT 06520 USA.
Univ Chicago, James Franck Inst, Chicago, IL 60637 USA.
Argonne Natl Lab, Argonne, IL 60349 USA.

Доп.точки доступа:
Handunkanda, S. U.; Curry, E. B.; Voronov, V. N.; Воронов, Владимир Николаевич; Said, Ayman H.; Guzman-Verri, G. G.; Brierley, R. T.; Littlewood, P. B.; Hancock, J. N.
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18.

Lattice dynamics and hydrostatic-pressure-induced phase transitions in ScF3 / K. S. Aleksandrov [et al.] // J. Exp. Theor. Phys. - 2002. - Vol. 94, Is. 5. - P. 977-984, DOI 10.1134/1.1484991. - Cited References: 20 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
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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Публикация на русском языке Динамика решетки и индуцированные гидростатическим давлением фазовые переходы в ScF[3] [Текст] / К. С. Александров [и др.] // Журн. эксперим. и теор. физ. - 2002. - Т. 121 Вып. 5. - С. 1139-1148

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Joint Inst Geol Geophys & Mineral, Siberian Div, Novosibirsk 630090, Russia

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович; Krylov, A. S.; Крылов, Александр Сергеевич
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19.

Lattice dynamics and phase transitions in A2BMeF6 elpasolites studied by raman scattering / A. N. Vtyurin [et al.] // 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

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; 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); Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина
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20.

Lattice dynamics and phase transitions in A[[d]]2[[/d]]BMeF[[d]]6[[/d]] elpasolites studied by raman scattering / A. S. Krylov [и др.] // 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. - P207

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Goryainov, S. V.; Горяйнов, Сергей Владимирович; Voronov, V. N.; Воронов, Владимир Николаевич; 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); Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина
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