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1.

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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2.

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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3.

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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4.

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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5.

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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6.

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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7.

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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8.

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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9.

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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10.

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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