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    A non-typical sequence of phase transitions in (NH4)3GeF7: optical and structural characterization / S. V. Mel'nikova [et al.] // Dalton Trans. - 2016. - Vol. 45, Is. 12. - P. 5321-5327, DOI 10.1039/c5dt04907e. - Cited References:25. - The reported study was partially supported by RFBR, research project no. 15-02-02009 a . - ISSN 1477-9226. - ISSN 1477-9234
   Перевод заглавия: Необычная последовательность фазовых переходов в (NH4)3GeF7: Оптическое и структурное исследование

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
Crystal-structure
   Powder diffraction
   NH4F
   Fluorination
Аннотация: Single crystals of germanium double salt (NH4)3GeF7 = (NH4)2GeF6·NH4F = (NH4)3[GeF6]F were grown and studied by the methods of polarization optics and X-ray diffraction. The birefringence Δn = (no − ne), the rotation angle of the optical indicatrix ϕ(T) and unit cell parameters were measured in the temperature range 100–400 K. Three structural phase transitions were found at the temperatures: T1↓ = 279.2 K (T1↑ = 279.4 K), T2↑ = 270 K (T2↓ = 268.9 K), T3↓ = 218 K (T3↑ = 227 K). An unusual sequence of symmetry transformations with temperature change was established: P4/mbm (Z = 2) (G1) ↔ Pbam (Z = 4) (G2) ↔ P21/c (Z = 4) (G3) ↔ Pa (Z = 8) (G4). The crystal structures of different phases were determined. The experimental data were additionally interpreted by a group-theoretical analysis of the complete condensate of order parameters taking into account the critical and noncritical atomic displacements. Strengthening of the N–H⋯F hydrogen bonds can be a driving force of the observed phase transitions.

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Держатели документа:
SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
RAS, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia.
Siberian Fed Univ, Krasnoyarsk 660074, Russia.

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Laptash, N. M.; Misyul, S. V.; Мисюль, Сергей Валентинович; RFBR [15-02-02009 a]
}
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Aleksandrov, K. S.
Successive phase-transitions in crystals of K2MGF4-type structure / K. S. Aleksandrov, B. V. Beznosikov, S. V. Misyul // Phys. Status Solidi A. - 1987. - Vol. 104, Is. 2. - P. 529-543, DOI 10.1002/pssa.2211040204. - Cited References: 66 . - ISSN 0031-8965

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

WOS
Доп.точки доступа:
Beznosikov, B. V.; Безносиков, Борис Валерьевич; Misyul, S. V.; Мисюль, Сергей Валентинович; Александров, Кирилл Сергеевич
}
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Aleksandrov, K. S.
Successive phase-transitions in ferroelastic cs2rbdyf6 with elpasolite-type structure / K. S. Aleksandrov, S. V. Melnikova, S. V. Misyul // Phys. Status Solidi A. - 1987. - Vol. 104, Is. 2. - P. 545-548, DOI 10.1002/pssa.2211040205. - Cited References: 6 . - ISSN 0031-8965

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

WOS
Доп.точки доступа:
Melnikova, S. V.; Мельникова, Светлана Владимировна; Misyul, S. V.; Мисюль, Сергей Валентинович; Александров, Кирилл Сергеевич
}
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Aleksandrov, K. S.
Successive structural phase-transitions in layered crystals. 1. TlAlF4 type crystals / K. S. Aleksandrov, B. V. Beznosikov, S. V. Misyul // Ferroelectrics. - 1987. - Vol. 73, Is. 1. - P. 201-220, DOI 10.1080/00150198708227918. - Cited References: 50 . - ISSN 0015-0193

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter

Аннотация: Rotational distortions due to octahedral tilts and possible ways of successive phase transitions are considered in crystals of TIAIF4-type structure. Crystallographical and group-theoretical analysis of possible transitions from the initial space group D14h was performed. It is shown that in some crystals of the studied type there exist the examples of distortional polytypism, i.e., different types of octahedral tilts in the neighbour layers which have been equivalent in the initial phase.

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Доп.точки доступа:
Beznosikov, B. V.; Безносиков, Борис Валерьевич; Misyul, S. V.; Мисюль, Сергей Валентинович; Александров, Кирилл Сергеевич
}
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Aleksandrov, K. S.
Symmetrical analysis of structural phase transitions in crystals with the Oh 5 space group / K. S. Aleksandrov, S. V. Misyul, E. E. Baturinets // Ferroelectrics. - 2007. - Vol. 354, Is. 1. - P. 60-68, DOI 10.1080/00150190701454529. - Cited References: 13 . - ISSN 0015-0193
Кл.слова (ненормированные):
Complete condensate of order parameters -- Elpasolites -- Group-theoretical methods -- Phase transitions -- Elpasolites -- Experimental data -- Group-theoretical methods -- Order parameter -- Permutation representation -- Space Groups -- Structural phase transition -- Ammonium compounds -- Crystals -- Halide minerals -- Phase transitions
Аннотация: Using the group-theoretical methods, the complete set of critical and noncritical order parameters arising at phase transitions in crystals with the Oh 5- Fm3m space group has been obtained and analyzed. The mechanical and permutation representations have been constructed, and their composition for all the right systems of points of the Oh 5 space group has been determined. Experimental data on structural phase transitions in ammonium cryolites and elpasolites have been considered.

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Держатели документа:
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation
L. V. Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Scientific and Research Institute of Physics, Southern Federal University, 344090 Rostov-on-Don, Russian Federation

Доп.точки доступа:
Misyul, S. V.; Мисюль, Сергей Валентинович; Baturinets, E. E.; Александров, Кирилл Сергеевич
}
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Anharmonic thermal atomic vibrations in the cubic phase of Cs//2NaNdCl//6 single crystals. / I. P. Makarova [et al.] // Phys Status Solidi B. - 1984. - Vol. 121, Is. 2. - P. 481-486 . - ISSN 0370-1972
Кл.слова (ненормированные):
CRYSTALS -- X-RAYS - Diffraction -- ANHARMONIC THERMAL ATOMIC VIBRATIONS -- CUBIC PHASE -- PHASE TRANSITIONS -- CESIUM COMPOUNDS
Аннотация: Thermal atomic vibrations in the cubic phase of Cs//2NaNdCl//6 single crystal undergoing the structural phase transition (PT) at 138 K are investigated from the data of X-ray diffraction obtained at 278, 218, and 148 K. A significant anisotropy of thermal vibrations and their deviations from harmonic behavior are found for the Cl-atoms of the structure. These atoms displace from their equilibrium positions below PT due to the tilts of the octahedral groups.

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Держатели документа:
Acad of Sciences of the USSR, A. V., Shubnikov Inst of Crystallography,, Moscow, USSR, Acad of Sciences of the USSR, A. V. Shubnikov Inst of Crystallography, Moscow, USSR

Доп.точки доступа:
Makarova, I. P.; Misyul, S. V.; Мисюль, Сергей Валентинович; Muradyan, L. A.; Bovina, A. F.; Бовина, Ася Федоровна; Simonov, V. I.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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    Crystal and magnetic structures, phase transitions in quasi-one-dimensional pyroxenes Na0.5Li0.5FeGe2O6 / T. V. Drokina [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 385. - P. 243-249, DOI 10.1016/j.jmmm.2015.03.016. - Cited References:25. - Neutron beam time at the cold neutron powder diffractometer DMC at the Swiss spallation neutron source SINQ Paul Scherrer Institut, Switzerland is gratefully acknowledged. MF acknowledges funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under Grant Agreement no. 290605 (PSIFELLOW/COFUND). This work was also supported by Ministry of Education and Science of the Russian Federation of Siberian Federal University 2014 year (Assignment no. 3.2534.2014/K). . - ISSN 0304. - ISSN 1873-4766
   Перевод заглавия: Кристаллическая и магнитные структуры, фазовые переходы в квазиодномерном пироксене Na0.5Li0.5FeGe2O6

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
CLINOPYROXENE-TYPE LIFEGE2O6
NAFESI2O6
LIFESI2O6
Кл.слова (ненормированные):
Phase transition -- Magnetic structure -- Pyroxene -- Magnetic properties -- Calorimetric measurements
Аннотация: The possibility of cation substitution in pyroxenes allows the investigation the gradual change of structural and magnetic properties under doping in these compounds. Here, Na0.5Li0.5FeGe2O6 was prepared by the standard solid-phase reaction method and has been investigated using X-ray and neutron powder diffraction, and further characterized by magnetic and calorimetric measurements. The crystal structure of Na0.5Li0.5FeGe2O6 at 300 K is monoclinic C2/c (a=10.0333(1), b=8.8136(1), c=5.5295(9) Å, β=108.921(1)°). Calorimetric investigations indicate a displacive first order phase transition at T=271±1 K which is accompanied by the appearance of superstructure reflections in the X-ray patterns. At this transition Na0.5Li0.5FeGe2O6 undergoes a space group change from C2/c to P21/c (a=9.9692(3), b=8.8545(3), c=5.4752(2) Å, β=108.494(1)°). Magnetic order has been found below the Néel temperature TN≈18 K and has been refined from neutron diffraction. The quasi-low-dimensional magnetic spin system Na0.5Li0.5FeGe2O6 exhibits a collinear antiferromagnetic structure with the space group Pa21/c and the doubling of the unit cell along the crystallographic a-axis of the pyroxene crystal (propagation vector k=(1/2, 0, 0)). The critical modes which are responsible for the phase transition from C2/c to P21/c symmetry and for the magnetic transition from paramagnetic to antiferromagnetic state have been determined and their role in the transition is described. They are also the relevant mechanism driving the magnetic order in LiFeGe2O6.

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Far Eastern State Transport Univ, Khabarovsk 680021, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland

Доп.точки доступа:
Drokina, T. V.; Дрокина, Тамара Васильевна; Petrakovskii, G. A.; Петраковский, Герман Антонович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Misyul, S. V.; Мисюль, Сергей Валентинович; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Frontzek, M.; Schefer, J.; Ministry of Education and Science of the Russian Federation of Siberian Federal University
}
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Crystal structure and phase transition mechanisms in CsFe2F6 / M. S. Molokeev [et al.] // J. Solid State Chem. - 2013. - Vol. 200. - P. 157-164DOI 10.1016/j.jssc.2013.01.038
Аннотация: For the first time, structural phase transitions induced by the temperature were found in AxMxIIM(1−x)IIIF3 fluorides with the defect pyrochlore structure (Fdm, Z=8). The room temperature structure of CsFe2F6 was determined using X-ray powder diffraction technique. This phase was found to be ordered with the Pnma space group. The study of the temperature stability of orthorhombic structure by differential scanning calorimeter between 100 K and 700 K has shown a succession of phase transitions. The Pnma (Z=4)→Imma (Z=4)→I41/amd (Z=4)→Fdm (Z=8) structural sequence was proposed to occur within a rather narrow temperature range 500–560 K. The mechanism of structural transition has been mainly associated with the rotation of (MF6) octahedra and small displacements of some Fe atoms. This assumption is in good agreement with the low experimental entropy value, which is characteristic for displacive transformations.

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Держатели документа:
Siberian Dept RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
State Agrarian Univ, Inst Energet & Management Energet Sources, Krasnoyarsk 660049, Russia
Siberian Fed Univ, Inst Phys Engn & Radioelect, Krasnoyarsk 660074, Russia
Univ Bordeaux, CNRS, ICMCB, F-33608 Pessac, France

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Misyul, S. V.; Мисюль, Сергей Валентинович; Tressaud, A.; Flerov, I. N.; Флёров, Игорь Николаевич
}
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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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10.

    Improper ferroelectric phase due to condensation of two order parameters in crystals of high-temperature superconductors / G. M. Chechin [et al.] // Ferroelectrics. - 1992. - Vol. 130, Is. 1. - P. 155-162. - Cited References: 21 . - ISSN 0015-0193
Рубрики:
TRANSITIONS
   FERROELASTICS
   RB3CD2CL7
Кл.слова (ненормированные):
Ceramic materials -- Crystals -- Ferroelectricity -- Phase diagrams -- Order parameters -- Oxide superconductors -- High temperature superconductors
Аннотация: Using group-theoretical methods it is shown that improper ferroelectric phase may arise in high-temperature superconductors (HTSC) where high-symmetry phases have space groups D4h1 or D4h17. Their appearance is caused by condensation of order parameters (OP's) transforming two irreducible representations (IR's). The most typical phase diagrams are considered, as well as temperature dependence of OP's and the basic structural mechanism of the ferroelectricity arising in the HTSC.

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Держатели документа:
Rostov-on-Don Univ, Rostov, Russian Federation

Доп.точки доступа:
Chechin, G. M.; Sakhnenko, V. P.; Misyul, S. V.; Мисюль, Сергей Валентинович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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11.

Misyul, S. V.
Structural changes in the trigger transition, critical and noncritical order parameters in the Rb2KHoF6 elpasolite / S. V. Misyul, M. S. Molokeev, I. N. Safonov // The 7th International Seminar on Ferroelastic Physics : abstract book. - Voronezh, 2012. - P. 20

Программа семинара,
Материалы конференции

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Safonov, I. N.; Мисюль, Сергей Валентинович; Воронежский государственный технический университет; Российская академия наук; International Seminar on ferroelastic physics (7 ; 2012 ; Sept. 10-13 ; Voronezh); Международный семинар по физике сегнетоэластиков (7(12) ; 2012 ; сент. ; 10-13 ; Воронеж)
}
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12.

Mn2+ paramagnetic resonance and structural phase transitions in Rb2CdCl4 / K. S. Aleksandrov [et al.] // Solid State Commun. - 1985. - Vol. 53, Is. 10. - P. 835-839. - Cited References: 18 . - ISSN 0038-1098
Кл.слова (ненормированные):
MAGNETIC RESONANCE -- OPTICAL METHODS -- PARAMAGNETIC RESONANCE -- STRUCTURAL PHASE TRANSITIONS -- CRYSTALS
Аннотация: Structural phase transition in Rb2CdCl4: Mn2+ single crystal has been found near 133 K by EPR, X-ray and optical methods. Octahedral tilt system in the low temperature phase corresponds to the symmetry change D17 4h > D18 2h or D17 4h > C6 2h. В© 1985.

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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Emelyanova, L. S.; Misjul, S. V.; Мисюль, Сергей Валентинович; Kokov, I. T.
}
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13.

Molokeev, M. S.
Processes of ordering of structural elements, critical and noncritical parameters of phase transitions in the (NH4)3WO3F3 crystal / M. S. Molokeev, S. V. Misyul' // Phys. Solid State. - 2012. - Vol. 54, Is. 1. - P. 155-165, DOI 10.1134/S1063783412010222. - Cited References: 18. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00062) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4645.2010.2). . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
OXYFLUORIDE
   TRANSFORMATIONS
   (NH4)3TiOF5
   DISORDER
Аннотация: The structure of the low-temperature triclinic phase of the (NH4)3WO3F3 crystal has been determined and the structure of the cubic phase of this crystal has been refined from data of an X-ray diffraction experiment performed for a powder sample. The profile and structural parameters have been refined according to the procedure implemented in the DDM program. The results obtained have been discussed with invoking the group-theoretical analysis of the complete order parameter condensate, which takes into account the critical and noncritical atomic orderings and allows one to interpret the obtained experimental data. It has been found that the symmetry transformation in the crystal can be schematically represented in the following form: Fm3¯m(Z=4)→P1¯(Z=1)→P1¯(Z=6)Fm\bar 3m(Z = 4) \to P\bar 1(Z = 1) \to P\bar 1(Z = 6) . This transformation is accompanied by the complete ordering of WO3F3 polyhedra and the displacement of NH4 ions.

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Публикация на русском языке Молокеев, Максим Сергеевич. Процессы упорядочения структурных элементов, критические и некритические параметры переходов в кристалле (NH4)3WO3F3 [Текст] / М. С. Молокеев, С. В. Мисюль // Физ. тверд. тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54 Вып. 1. - С. 144-153

Держатели документа:
[Molokeev, M. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Misyul', S. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Misyul', S. V.; Мисюль, Сергей Валентинович; Молокеев, Максим Сергеевич
}
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14.

Molokeev, M. S.
Structural changes during phase transitions and the critical and noncritical order parameters in the (NH4)3Nb(O2)2F4 crystal / M. S. Molokeev, S. V. Misyul' // Phys. Solid State. - 2012. - Vol. 54, Is. 1. - P. 143-154, DOI 10.1134/S1063783412010234. - Cited References: 17. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00062) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4645.2010.2). . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
TRANSFORMATIONS
OXYFLUORIDE
CELL
Аннотация: The structures of two phases of the (NH4)3Nb(O2)2F4 crystal, namely, the parent cubic phase and the most distorted low-temperature phase, have been determined from data of an X-ray diffraction experiment performed for a powder sample. The profile and structural parameters have been refined according to the procedure implemented in the DDM program. The results obtained have been discussed with invoking the group-theoretical analysis of the complete order parameter condensate, which takes into account the critical and noncritical atomic displacements and allows the interpretation of the obtained experimental data. It has been found that the most probable sequence of structural transformations occurring in the crystal can be schematically represented in the following form: Fm3¯m−→−−−−(η1,η1,η)Γ+5(11−7)C2/m−→−−−−−−−−−−−−−−−−(η1,η1,η)(0,0,0,0,0,ξ,0−ξ,0,0,0,0)Γ+5(11−7)⊗Σ2(4−2)P21/m−→−−−−−−−−−−−−−−−−−−−−−−−−−−−−(η1,η1,η)(0,0,0,0,0,ξ,0−ξ,0,0,0,0)(0,0,0,0,0,ε,0,ε,0,0,0,0)Γ+5(11−7)⊗Σ2(4−2)⊗Σ3(4−3)P21/n.\begin{gathered} Fm\bar 3m\xrightarrow[{(\eta 1,\eta 1,\eta )}]{{\Gamma _5. + (11 - 7)}}C2/m\xrightarrow[{(\eta 1,\eta 1,\eta )(0,0,0,0,0,\xi ,0 - \xi ,0,0,0,0)}]{{\Gamma _5. + (11 - 7) \otimes \Sigma _2 (4 - 2)}}P2_1 /m \hfill \\ \xrightarrow[{(\eta 1,\eta 1,\eta )(0,0,0,0,0,\xi ,0 - \xi ,0,0,0,0)(0,0,0,0,0,\varepsilon ,0,\varepsilon ,0,0,0,0)}]{{\Gamma _5. + (11 - 7) \otimes \Sigma _2 (4 - 2) \otimes \Sigma _3 (4 - 3)}}P2_1 /n. \hfill \\ \end{gathered}

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Публикация на русском языке Молокеев, Максим Сергеевич. Структурные изменения при фазовых переходах, критические и некритические параметры порядка в кристалле(NH4)3Nb(O2)2F4 [Текст] / М. С. Молокеев, С. В. Мисюль // Физ. тверд. тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54 Вып. 1. - С. 134-143

Держатели документа:
[Molokeev, M. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Misyul', S. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Misyul', S. V.; Мисюль, Сергей Валентинович; Молокеев, Максим Сергеевич
}
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15.

Molokeev, M. S.
Structural transformations and the critical and noncritical parameters during the phase transition in the (NH4)(2)KWO3F3 oxyfluoride / M. S. Molokeev, S. V. Misyul' // Phys. Solid State. - 2011. - Vol. 53, Is. 8. - P. 1672-1679, DOI 10.1134/S1063783411080208. - Cited References: 18. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4645.2010.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MOLECULAR CRYSTALS
DISORDER
(NH4)(3)WO3F3
Аннотация: The structures of two phases of the (NH4)(2)KWO3F3 crystal have been determined from X-ray diffraction data obtained for a powder sample. The profile and structural parameters have been refined according to the procedure implemented in the DDM program. The results obtained have been discussed with invoking the group-theoretical analysis of the complete order parameter condensate, which takes into account the critical and noncritical atomic orderings and allows one to interpret the experimental data. It has been found that the symmetry transformation in the crystal can be schematically represented in the form Fm (3) over barm (10-10((X) over bar5)) - ((eta, 0, 0, 0, 0, 0)) Pmmn.This transformation is accompanied by the ordering of WO3F3 polyhedra and the displacement of NH4 and K ions.

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Держатели документа:
[Molokeev, M. S.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Misyul', S. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Misyul', S. V.; Мисюль, Сергей Валентинович; Молокеев, Максим Сергеевич
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16.

Optical and x-ray diffraction investigations of the symmetry of distorted phases of the (NH4)(2)KGaF6 crystal / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2002. - Vol. 44, Is. 10. - P. 1967-1971, DOI 10.1134/1.1514789. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
THERMODYNAMIC PROPERTIES
TRANSITION
Аннотация: Powders and single-crystal plates of different sections of an (NH4)(2)KGaF6 crystal are investigated using polarized light microscopy and x-ray diffraction over a wide temperature range, including the phase transition temperatures. It is established that the sequence of symmetry changes in the crystal under investigation is as follows: O-h(5)-Fm3m (Z = 4) ↔ C-4h(5)-I114/m (Z = 2) ↔ C-2h(5)-P112(1)/n (Z = 2). (C) 2002 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Misyul', S. V.; Мисюль, Сергей Валентинович; Bovina, A. F.; Бовина, Ася Федоровна; Afanas'ev, M. L.
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17.

Optical and X-ray Diffraction Studies of the Symmetry of Distorted Phases of the (NH4)(3)ZrF7 Crystal / S. V. Misyul [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 10. - P. 1951-1956, DOI 10.1134/S1063783408100272. - Cited References: 12. - This work was supported by the Council on Grants from the President of the Russian Federation (project NSh-4137.2006.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
AMMONIUM HEPTAFLUOROZIRCONATE
   DISORDER
   TRANSITION
   K3ZRF7
Аннотация: (NH4)(3)ZrF7 single crystals were grown, and polarization-optical and x-ray diffraction studies were performed on powders and crystalline plates of various cuts over a wide temperature range. Phase transitions are revealed at temperatures T-1 up arrow = 280 K, T-2 up arrow = 279.6 K, T-3 up arrow = 260-265 K, and T-4 up arrow = 238 K on heating and at T-1 down arrow = 280 K, T-2 down arrow = 269-270 K, T-3 down arrow = 246 K, and T-4 down arrow = 235 K on cooling. The sequence of changes in symmetry is established to be as follows: O-h(5) (Z = 4)↔ D-2h(25) (Z = 2) ↔ C-2h(3) (Z = 2)↔ C-i(1) (Z = 108)↔ monoclinic(2) (Z = 216).

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Держатели документа:
[Misyul, S. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Mel'nikova, S. V.
Bovina, A. F.] Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Siberian Federal University, Svobodnyi pr. 59, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Misyul, S. V.; Мисюль, Сергей Валентинович; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Bovina, A. F.; Бовина, Ася Федоровна; Laptash, N. M.
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18.

Optical and x-ray studies of the structural phase transition in cryolite (NH4)(3)GaF6 / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2001. - Vol. 43, Is. 8. - P. 1594-1597, DOI 10.1134/1.1395110. - Cited References: 7 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: Optical polarization and x-ray diffraction studies of powders and single-crystal plates of different cuts of an (NH4)(3)GaF6 crystal are carried out in a broad temperature range, including the phase transition point. The following sequence of symmetry changes is found to occur: O-h(5) - Fm3m (Z = 4)↔ C-i(1) - I (1) over bar (Z = 16). (C) 2001 MAIK "Nauka /Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk Agr Univ, Krasnoyarsk 660049, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk Agricultural University, pr. Mira 88, Krasnoyarsk, 660049, Russian Federation

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Misyul', S. V.; Мисюль, Сергей Валентинович; Bovina, A. F.; Бовина, Ася Федоровна; Afanas'ev, M. L.
}
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19.

Phase transition in MNBO4 type crystals / M. P. Zaitseva [et al.] // Journal of the Physical Society of Japan. - 1980. - Vol. 49, Supplement B. - P. 99-101 . - ISSN 0031-9015

Материалы конференции

Доп.точки доступа:
Zaitseva, M. P.; Зайцева, Мария Пантелеймоновна; Krasikov, V. S.; Kruglik, A. I.; Круглик, Анатолий Иванович; Misyul, S. V.; Мисюль, Сергей Валентинович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Japanese-Soviet symposium on ferroelectricity(2 ; 1980 ; Sept. 6-11 ; Kyoto, Japan); Советско-японский симпозиум по сегнетоэлектричеству(2 ; 1980 ; 6-11 сент. ; Киото, Япония)
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20.

Phase transitions in defect pyrochlore structure of CsFe2F6 / M. S. Molokeev [et al.] // 17th European Symposium on Fluorine Chemistry : Abstracts book. - 2013. - P. 276

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Misyul, S. V.; Мисюль, Сергей Валентинович; Tressaud, A.; Flerov, I. N.; Флёров, Игорь Николаевич; European Symposium on Fluorine Chemistry (17 ; 2013 ; June ; 21-25 ; Paris, France)
}
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