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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

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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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Effect of central cation substitutionon the properties and phase transitions in (NH4)3Me(O2)2F4 oxyfluorides / V. D. Fokina, I. N. Flerov, M. S. Molokeev [et al.] // The 6th International Seminar on Ferroelastic Physics : abstract book. - Voronezh, 2009. - P. 5

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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; 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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Kolesnikova, E. M.
Nonempirical calculation lattice dynamics of oxyfluorides A2KWO3F3 (A= Cs, K, Rb) / E. M. Kolesnikova, S. N. Sofronova // Abstracts of the 10th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity. - 2010. - P. 171

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Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Колесникова, Евгения Михайловна; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(10 ; 2010 ; June 20-25 ; Yokohama, Japan)
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    Disorder and phase transitions in oxyfluoride (NH4)(3)Ta(O-2)(2)F-4 / I. N. Flerov [et al.] // J. Fluor. Chem. - 2011. - Vol. 132, Is. 10. - P. 713-718, DOI 10.1016/j.jfluchem.2011.05.012. - Cited Reference Count: 19. - Гранты: This work was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-4645.2010.2). - Финансирующая организация: Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-4645.2010.2] . - ISSN 0022-1139
Рубрики:
HEAT-CAPACITY
   COMPLEXES
   RB2KTIOF5
   FLUORIDES
   CRYOLITE
Кл.слова (ненормированные):
cubic oxyfluorides -- structural disorder -- phase transitions -- entropy -- permittivity -- pressure effect -- cubic oxyfluorides -- entropy -- permittivity -- phase transitions -- pressure effect -- structural disorder
Аннотация: Calorimetric, X-ray, dielectric and DTA under pressure measurements have been performed on oxyfluoride (NH4)(3)Ta(O-2)(2)F-4. The succession of nonferroelectric phase transitions was found associated with the order-disorder processes. The comparative analysis tantalate with related niobate has revealed the important role of the central atom in the physical properties behavior, mechanism of structural distortions and barocaloric effect in oxyfluorides with the eight-coordinated anionic polyhedra. (C) 2011 Elsevier By. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Siberian Dept, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
RAS, Inst Chem, Far Eastern Dept, Vladivostok 690022, Russia

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Laptash, N. M.
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Vibrational spectroscopy of alkaline tungsten oxyfluoride crystals: structure, lattice dynamics, ordering processes, and phase transitions [Text] / A. N. Vtyurin [et al.] // J. Raman Spectrosc. - 2010. - Vol. 41, Is. 12. - P1784-1791, DOI 10.1002/jrs.2637. - Cited Reference Count: 13. - Гранты: We would like to thank Prof. Igor Flerov for fruitful discussion. Technical assistance of Victor Ouskin is highly appreciated. This work has been supported by the Russian Foundation for Basic Researches, grant no. 08-02-00066-a. - Финансирующая организация: Russian Foundation for Basic Researches [08-02-00066-a] . - DEC. - ISSN 0377-0486
Рубрики:

Кл.слова (ненормированные):
Raman scattering -- infrared absorption -- alcaline tungsten oxyfluorides -- phase transitions -- alcaline tungsten oxyfluorides -- infrared absorption -- phasetransitions -- Raman scattering
Аннотация: Raman scattering (RS) and infrared absorption (IR) of ammonium oxyfluoride crystals (NH(4))(3)WO(3)F(3), (NH(4))(2)KWO(3)F(3), and Cs(2)(NH(4))WO(3)F(3) are compared. Conformation of the WO(3)F(3) octahedral groups has been established; anomalies have been found close to the transition temperatures in the internal vibrational regions of ammonium and WO(3)F(3) groups. The phase transition in (NH(4))(3)WO(3)F(3) is associated mostly with the ordering of octahedral groups and formation of W-O center dot center dot center dot H-N hydrogen bonds. In (NH(4))(2)KWO(3)F(3) crystal, the transition is not related to the ordering processes; CS(2)(NH(4))WO(3)F(3) retains its disordered structure down to 10 K. Copyright (C) 2010 John Wiley & Sons, Ltd.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Inst Chem, Vladivostok 690022, Russia

Доп.точки доступа:
Vtyurin, A.N.; Gerasimova, J.V.; Krylov, A.S.; Ivanenko, A.A.; Shestakov, N.P.; Laptash, N.M.; Voyt, E.I.
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The nonemperical calculations of the lattice dynamics of the oxyfluorides A2KW03F3 (A=Cs, Rb, K) [Text] / E. M. Kolesnikova, S. N. Sofronova // 12th European Meeting on Ferroelectricity : Abstracts. - 2011. - Ст. Pl-26

Доп.точки доступа:
Kolesnikova, E.M.; Sofronova, S.N.; European Meeting on Ferroelectricity(12 ; 2011 ; 26 June - 1 July ; Bordeaux, France)
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Barocaloric and piezocaloric effects in some ferroelectric and fer- roelastic oxyfluorides [Text] / I. N. Flerov, M. V. Gorev // 12th European Meeting on Ferroelectricity : Abstracts. - 2011. - Ст. 9A-20

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Доп.точки доступа:
Flerov, I.N.; Gorev, M.V.; European Meeting on Ferroelectricity(12 ; 2011 ; 26 June - 1 July ; Bordeaux, France)
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    Phase transitions in (NH4)2MoO2F4 crystal / A. Krylov [et al.] // J. Mol. Struct. - 2016. - Vol. 1124, Special Issue : Novel developments and applications of two-dimensional correlation spectroscopy — A festschrift in honor of professor Isao Noda. - P. 125-130, DOI 10.1016/j.molstruc.2016.03.009. - Cited References:17 . - ISSN 0022-2860. - ISSN 1872-8014
   Перевод заглавия: Фазовые переходы в кристалле (NH4)2MoO2F4

РУБ Chemistry, Physical
Рубрики:
OXYFLUORIDE
   (NH4)2WO2F4
   DISORDER
   DIAGRAMS
Кл.слова (ненормированные):
Phase transitions -- Raman high-pressure -- Two-dimensional correlations -- Oxyfluorides
Аннотация: The mechanisms of temperature and high pressure phase transitions have been studied by Raman spectroscopy. Room temperature (295 K) experiments under high hydrostatic pressure up to 3.6 GPa for (NH4)(2) MoO2 F-4 have been carried out. Experimental data indicates a phase transition into a new high-pressure phase for (NH4)(2) MoO2 F-4 at 1.2 GPa. This phase transition is related to the ordering anion octahedron groups [MoO2 F-4](2) and is not associated with ammonium group. Raman spectra of small non-oriented crystals ranging from 10 to 350 K have been observed. The experiment shows anion groups [MoO2 F-4](2-) and ammonium in high temperature phase are disordered. The phase transition at T-1 = 269.8 K is of the first-order, close to the tricritical point. The first temperature phase transition is related to the ordering anion octahedron groups [MoO2 F-4](2-). Second phase transitions T-2 = 180 K are associated with the ordering of ammonium. The data presented within this study demonstrate that 2D correlation analysis combined with traditional Raman spectroscopy are powerful tool to study phase transitions in the crystals. (C) 2016 Elsevier B.V. All rights reserved.

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Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Laptash, N. M.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; International Symposium on Two-Dimensional Correlation Spectroscopy(8th ; JUL 08-11, 2015 ; Vienna, Austria)
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    Caloric Effects in Some Ferroelectric and Ferroelastic Fluorides, Oxyfluorides and Oxides / I. N. Flerov [et al.] // Joint 13th Russia/CIS/Baltic/Japan Symp. on Ferroelectricity and Int. Workshop on Relaxor Ferroelectrics (RCBJSF-IWRF 2016) : book of abstracts. - 2016. - Ст. Invite-6. - References: 4. - The reported study was partially supported by RFBR, research project No. 15-02-02009 a
   Перевод заглавия: Калорические эффекты в некоторых сегнетоэлектрических и сегнетоэластических фторидах, оксифторидах и оксидах

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Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Kartashev, A. V.; Карташев, Андрей Васильевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; Jun. ; 19-23 ; Matsue, Japan); International Workshop on Relaxor Ferroelectrics(2016 ; Jun. ; 19-23 ; Matsue, Japan)
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10.

    The structure and phase transitions in oxyfluoride (ND4)2MoO2F4 / E. V. Bogdanov [et al.] // Solid State Sci. - 2016. - Vol. 61. - P. 155-160, DOI 10.1016/j.solidstatesciences.2016.08.012. - Cited References: 18. - The authors are grateful to A.G. Kocharova for the synthesis and deuteration of the samples, and to A.A. Sukhovsky and Y.N. Ivanov for the execution of NMR studies to determine the degree of sample deuteration. - This study was partially supported by Russian Foundation for Basic Research, project No. 16–32–00201 mol_а. . - ISSN 1293-2558
   Перевод заглавия: Структура и фазовые переходы в оксифториде (ND4)2MoO2F4
Кл.слова (ненормированные):
Deuterium -- Heavy water -- Single crystals -- X ray analysis -- Crystal phasis -- Deuterations -- Distorted phasis -- Oxyfluorides -- Polarization optics -- Scanning microcalorimetry -- Tricritical point -- Molybdenum oxide
Аннотация: Single crystals of (ND4)2MoO2F4 containing 95% deuterium were produced by repeated recrystallization of (NH4)2MoO2F4 in heavy water. The effect of deuteration on the parameters of successive phase transitions was investigated by differential scanning microcalorimetry and polarization optics. X-ray analysis of the original and distorted phases was performed. It was found that deuteration does not change the sequence of crystal phases typical for (NH4)2MoO2F4, but leads to a shift in the phase transition Cmcm > Pnma towards the tricritical point. The mechanism of phase transitions in (ND4)2MoO2F4 was associated with both the ordering and the displacement of atoms. © 2016 Elsevier Masson SAS

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian State University, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, Khabarovsk, Russian Federation

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич
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