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   В37

    Мельникова, Светлана Владимировна.
    Оптические и электрооптические исследования последовательных фазовых переходов в кристаллах типа ABCl3 и A2BCl4 : автореферат дис. ... канд. физ.-мат. наук : 01.04.07 : защищена 30.11.1984 / С. В. Мельникова ; науч. рук. К. С. Александров ; офиц. оп.: Р. В. Писарев, И. С. Эдельман ; Акад. наук СССР, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского, вед. орг.: Львов. ун-т им. И. Франко. - Красноярск, 1984. - 12 с. - Библиогр.: 120 назв. - 100 экз. -

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29.31.21

29.19.15

Держатели документа:
Библиотека Института физики им. Л. В. Киренского СО РАН
Доп.точки доступа:
Александров, Кирилл Сергеевич \науч. рук.\; Aleksandrov, K. S.; Писарев, Роман Васильевич \офиц. опп.\; Эдельман, Ирина Самсоновна \офиц. опп.\; Edelman, I. S.; Mel'nikova, S. V.; Академия наук СССР; Сибирское отделение АН СССР; Институт физики им. Л.В. Киренского Сибирского отделения АН СССР; Львовский государственный университет им. И. Франко
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   В37
   М 48

    Мельникова, Светлана Владимировна.
    Оптические и электрооптические исследования последовательных фазовых переходов в кристаллах типа ABCl3 и A2BCl4 [Рукопись] : дис. на соиск. уч. степени канд. физ.-мат. наук : 01.04.07 / С. В. Мельникова ; науч. рук. К. С. Александров ; Акад. наук СССР, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского. - Красноярск, 1984. - 135 л. - Библиогр.: 120 назв. -

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29.31.21

29.19.15

ББК В374я031 + В375.1я031

Держатели документа:
Библиотека Института физики им. Л. В. Киренского СО РАН
Доп.точки доступа:
Александров, Кирилл Сергеевич \науч. рук.\; Aleksandrov, K. S.; Mel'nikova, S. V.; Академия наук СССР; Сибирское отделение АН СССР; Институт физики им. Л.В. Киренского Сибирского отделения АН СССР
Экземпляры всего: 1
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   В37


    Структурные фазовые переходы в кристаллах ABF[[d]]6[[/d]].6H[[d]]2[[/d]]O [Препринт] : препринт. № 654Ф / И. Н. Флёров [и др.] ; Акад. наук СССР, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского. - Красноярск : ИФ СО АН СССР, 1990. - 40 с. - Библиогр.: 27 назв. - 180 экз. -

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29.19.15

Держатели документа:
Библиотека Института физики им. Л. В. Киренского СО РАН
Доп.точки доступа:
Флёров, Игорь Николаевич; Flerov, I. N.; Горев, Михаил Васильевич; Gorev, M. V.; Мельникова, Светлана Владимировна; Mel'nikova, S. V.; Афанасьев, Михаил Лаврентьевич; Александров, Кирилл Сергеевич; Aleksandrov, K. S.; Академия наук СССР; Сибирское отделение АН СССР; Институт физики им. Л.В. Киренского Сибирского отделения АН СССР
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   В37


    Структурные фазовые переходы в новом ацентрическом кристалле RbLiCrO[[d]]4[[/d]] [Препринт] : препринт. № 680Ф / А. И. Круглик [и др.] ; Акад. наук СССР, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского. - Красноярск : ИФ СО АН СССР, 1991. - 36 с. - Библиогр.: 24 назв. - 150 экз. -

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29.19.15

Держатели документа:
Библиотека Института физики им. Л. В. Киренского СО РАН
Доп.точки доступа:
Круглик, Анатолий Иванович; Мельникова, Светлана Владимировна; Mel'nikova, S. V.; Толочко, Б. П.; Макарова, И. П.; Александров, Кирилл Сергеевич; Aleksandrov, K. S.; Академия наук СССР; Сибирское отделение АН СССР; Институт физики им. Л.В. Киренского Сибирского отделения АН СССР
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   В37


    Фазовые переходы в галоидных кристаллах со структурой эльпасолита [Препринт] : препринт. Ч. 2 ; № 346Ф / К. С. Александров [и др.] ; Акад. наук СССР, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского. - Красноярск : ИФ СО АН СССР, 1985. - 40 с. - Библиогр.: 54 назв. - 200 экз. -

ГРНТИ

29.19.15

Держатели документа:
Библиотека Института физики им. Л. В. Киренского СО РАН
Доп.точки доступа:
Александров, Кирилл Сергеевич; Aleksandrov, K. S.; Воронов, Владимир Николаевич; Voronov, V. N.; Горев, Михаил Васильевич; Gorev, M. V.; Мельникова, Светлана Владимировна; Mel'nikova, S. V.; Мисюль, Сергей Валентинович; Прокерт, Ф.; Флёров, Игорь Николаевич; Flerov, I. N.; Академия наук СССР; Сибирское отделение АН СССР; Институт физики им. Л.В. Киренского Сибирского отделения АН СССР
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   В37


    Фазовые переходы в галоидных кристаллах со структурой эльпасолита [Препринт] : препринт. Ч. 1 ; № 345Ф / К. С. Александров [и др.] ; Акад. наук СССР, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского. - Красноярск : ИФ СО АН СССР, 1985. - 40 с. - 200 экз. -

ГРНТИ

29.19.15

Polarization-optical and X-ray diffraction investigations on the symmetry of distorted phases of ammonium cryolite (NH4)(3)ScF6 / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2000. - Vol. 42, Is. 2. - P. 345-349, DOI 10.1134/1.1131210. - Cited References: 12 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
TRANSITIONS
Аннотация: Single-crystal plates of different sections of the (NH4)(3)ScF6 crystal have been investigated by polarization-optical microscopy and X-ray diffraction over a wide temperature range, including the temperatures of two known phase transitions and the third transition found recently. It is established that the symmetry of phases changes in the following sequence: O-h(5) - Fm3m (Z = 4) ↔ C-2h(5) - P12(1)/n1 (Z = 2)↔ C-2h(3) -I12/m1 (Z = 16) ↔ C-i(1) - I (l) over bar (Z = 16). (C) 2000 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
ИФ СО РАН

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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Flerov, I. N.
Calorimetric and optical studies of orthorhombic and cubic CsLiCrO4 crystals / I. N. Flerov, A. V. Kartashev, S. V. Mel'nikova // Phys. Solid State. - 2006. - Vol. 48, Is. 11. - P. 2171-2176, DOI 10.1134/S1063783406110242. - Cited References: 23 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   X-RAY
   NH4LISO4
   ALPHA
Аннотация: Careful calorimetric and polarization optical studies of a metastable cubic modification of a CsLiCrO4 crystal (space group (F43m)) are performed. Anomalies of the heat capacity indicative of structural distortions at 92.4 and 69.1 K were revealed, and the values of the thermodynamic parameters of the phase transitions were determined. The crystal twinning in the intermediate phase was studied. A comparative analysis of the phase transitions occurring in a series of ALiMO(4) crystals (A=NH4, Cs; M=S, Cr, Mo, W) was performed. First studies of the monotropic structural transformation F43m - Pmcn and the enantiotropic phase transition Pmcn reversible arrow P112(1)/n were carried out using scanning calorimetry, and the thermodynamic parameters of these transitions were determined.

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

Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Флёров, Игорь Николаевич
}
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Mel'nikova, S. V.
Phase transitions in RbxK1-xLiSO4 mixed crystals / S. V. Mel'nikova, M. V. Gorev, V. A. Grankina // Phys. Solid State. - 1998. - Vol. 40, Is. 7. - P. 1219-1222, DOI 10.1134/1.1130524. - Cited References: 12 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
LOW-TEMPERATURE PHASE
LIKSO4
Аннотация: Structural phase transitions in RbxK1-xLiSO4 mixed crystals (with x varying from 0 to 1) have been studied from the melting point to liquid-nitrogen temperature. Calorimetric (DTA and DSM) data, birefringence and optical polarization measurements were used to construct the full phase (T-x) diagram. It has been established that crystals of most compositions (x less than or equal to 0.95) grow in the hexagonal-trigonal KLiSO4 structure. Replacement of K by the larger Rb atom results in a considerable increase of the region of existence of the P31c phase and expulsion of the high-temperature hexagonal phase. (C) 1998 American Institute of Physics.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Grankina, V. A.; Мельникова, Светлана Владимировна
}
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10.

Search for and study of phase transitions in some representatives of the APb(2)X(5) family / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2006. - Vol. 48, Is. 11. - P. 2152-2156, DOI 10.1134/S1063783406110217. - Cited References: 5 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL
Аннотация: Single crystals of KPb2Cl5, RbPb2Cl5, and RbPb2Br5 are grown and studied using optical polarization methods. The heat capacity of the crystals is investigated by differential scanning microcalorimetry, and the birefringence and the angle of rotation of the optical indicatrix are measured. The measurements are performed in the temperature range 270-640K. It is found that KPb2Cl5 undergoes a first-order ferroelastic phase transition at T-0 up arrow=530K, T-0 down arrow=528K, and Delta H=1000 +/- 200 J/mol. The transition is accompanied by twinning and a change in symmetry mmm reversible arrow P2(1)/c. The RbPb2Cl5 crystal remains monoclinic up to the melting temperature. The RbPb2Br5 compound belongs to the I4/mcm tetragonal modification and does not undergo structural transformations.

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Mineral & Petrog, Siberian Div, Novosibirsk 630058, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute of Mineralogy and Petrography, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630058, Russian Federation

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Isaenko, L. I.; Pashkov, V. M.; Pevnev, I. V.
}
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11.

Investigation of the influence of gradual substitution K a dagger" Rb on the structure and phase transition in K (x) Rb1-x Pb2Br5 solid solutions / L. I. Isaenko [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 3. - P. 589-592, DOI 10.1134/S1063783409030251. - Cited References: 5. - This study was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools ( grant no. NSh-1011.2008.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL
Аннотация: Single crystals of K (x) Rb1 - x Pb2Br5 solid solutions have been grown and investigated using X-ray diffraction and polarized light microscopy in the temperature range 270-640 K. The regions of existence of the tetragonal (I4/mcm) and monoclinic (P2(1)/c) phases have been determined. It has been demonstrated that the partial introduction of rubidium into KPb2Br5 leads to an increase in the temperature of the ferroelastic phase transition (P2(1)/ca dagger"mmm), so that it approaches the melting temperature. In the solid solutions with x a parts per thousand 0.4-0.5, the temperature region of existence of the orthorhombic phase is narrowed to a parts per thousand 1-2 K. It has been revealed that an increase in the potassium content in the material results in a considerable increase in the incorporation coefficient of Er3+ ions.

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Держатели документа:
[Isaenko, L. I.
Merkulov, A. A.
Pashkov, V. M.
Tarasova, A. Yu.] Russian Acad Sci, Trofimuk United Inst Geol Geophys & Mineral, Siberian Branch, Novosibirsk 630090, Russia
[Mel'nikova, S. V.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Akad Gorodok, Krasnoyarsk 660036, Russia
ИФ СО РАН
Trofimuk United Institute of Geology, Geophysics, and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Koptyuga 3, Novosibirsk 630090, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Isaenko, L. I.; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Merkulov, A. A.; Pashkov, V. M.; Tarasova, A. Y.; President of the Russian Federation [NSh-1011.2008.2]
}
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12.

Mel'nikova, S. V.
Optical Studies of Phase Transitions in the (NH4)(3)VO2F4 Crystal / S. V. Mel'nikova, A. G. Kocharova // Phys. Solid State. - 2009. - Vol. 51, Is. 3. - P. 597-600, DOI 10.1134/S1063783409030275. - Cited References: 7. - This work was supported by the Council on Grants from the President of the Russian Federation (grant NSh-1011.2008.2) and the Russian Foundation for Basic Research (project no. 06-02-16 102). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
(NH4)3VO2F4
Аннотация: (NH4)(3)VO2F4 crystals were grown, and polarization-optical studies and measurements of birefringence were conducted on crystal plates of various cuts over a wide temperature range. Phase transitions were detected at temperatures T-1 up arrow = 417 K, T-3 up arrow = 211 K, and T-4 up arrow = 205 K (on heating) and at T-1 down arrow = 413 K, T-3 down arrow = 210 K, and T-4 down arrow = 200 K (on cooling). The transitions are accompanied by anomalies of the birefringence and by twinning. The sequence of changes in the phase symmetry is assumed to be as follows: cubic Fm (3) over barm↔ orthorhombic Immm (I222(1)) monoclinic 112/m)↔ triclinic P (1) over bar. Near temperatures T-2 approximate to 240-250 K, an additional anomaly of the birefringence is observed, with the crystal retaining the orthorhombic symmetry.

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Держатели документа:
[Mel'nikova, S. V.
Kocharova, A. G.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Kocharova, A. G.; Кочарова, Алла Георгиевна; Мельникова, Светлана Владимировна; Russian Federation [NSh-1011.2008.2]; Russian Foundation for Basic Research [06-02-16 102]
}
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13.

Optical studies of phase transitions in the (NH4)(3)Ti(O-2)F-5 crystal / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 4. - P. 817-822, DOI 10.1134/S1063783409040301. - Cited References: 13. - This work was supported by the Council on Grants from the President of the Russian Federation (project no. NSh-1011.2008.2), the Russian Foundation for Basic Research (project no. 06-02-16102), and RFBR Enisei (project no. 07-02-096800). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
(NH4)(3)WO3F3 OXYFLUORIDE
RAMAN-SCATTERING
DISORDER
Аннотация: Polarization-optical study of twinning and measurements of the Raman spectra and birefringence in oxyfluoride (NH4)(3)Ti(O-2)F-5 were carried out over the temperature range 90-350 K. Phase transitions were detected at temperatures T (01) = 266 K (second-order transition) and T (02) = 225 K (first order). It is assumed that the crystal symmetry is changed as follows: Fm3m a dagger" I4/mmm a dagger" I4/m. Anomalies of the spectral parameters are established in the frequency range of internal vibrations of ammonium ions and Ti(O-2)F-5 complexes. An analysis of the results shows that the transition at T (01) is likely due to small shifts of the tetrahedral groups from their position on the triad axis and that the transition at T (02) is due to fluorine-oxygen ordering of Ti(O-2)F-5 complexes.

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Держатели документа:
[Mel'nikova, S. V.
Krylov, A. S.
Zhogal', A. L.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, 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:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Krylov, A. S.; Крылов, Александр Сергеевич; Zhogal', A. L.; Laptash, N. M.; Russian Federation [NSh-1011.2008.2]; Russian Foundation for Basic Research [06-02-16102]; RFBR Enisei [07-02-096800]
}
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14.

Mel'nikova, S. V.
Specific features of the ferroelastic phase transition in CsLiS1-zCrzO4 solid solutions / S. V. Mel'nikova, V. N. Voronov // Phys. Solid State. - 2006. - Vol. 48, Is. 9. - P. 1786-1790, DOI 10.1134/S1063783406090290. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CSLICRO4 CRYSTAL
X-RAY
CSLISO4
Аннотация: Single crystals of the CsLiS1-zCrzO4 solid solutions (z = 0, 0. 1, 0.4, 0.5, 0.9, 1.0) are grown, optical polarization studies are performed, and the birefringence and the angle of rotation of the optical indicatrix phi(T) are measured. A (z-T) phase diagram is constructed in the temperature range from 77 to similar to 550 K. It is established that substitution of chromium for sulfur has practically no effect on the shape of the optical indicatrix in the initial phase with Pmcn symmetry but produces strong distortions in the monoclinic phase with P112(1)/n symmetry. The unusual shape of the curve phi(T) for compositions with z approximate to 1 is accounted for by the interaction of the polarization-constant tensor components a(ij). No radical differences in the patterns of the ferroelastic phase transition between CsLiSO4 and CsLiCrO4 are revealed (the critical exponent for the transition parameter is beta = 0.33 +/- 0.01). These crystals differ only in the magnitudes of the anomalies, which is associated with the large difference between the ionic radii of sulfur and chromium.

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

Доп.точки доступа:
Voronov, V. N.; Воронов, Владимир Николаевич; Мельникова, Светлана Владимировна
}
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15.

Mel'nikova, S. V.
Phase transitions in oxyfluoride (NH4)(2)WO2F4 / S. V. Mel'nikova, V. D. Fokina, N. M. Laptash // Phys. Solid State. - 2006. - Vol. 48, Is. 1. - P. 117-121, DOI 10.1134/S1063783406010239. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: (NH4)(2)WO2F4 single crystals are grown, and their polarization-optical, calorimetric, and birefringence properties are studied in the temperature range 90-350K. A first-order structural phase transition is found to occur at T-01 up arrow = 202K with thermal hysteresis of Delta T-01 approximate to 6-12K. The phase transition is accompanied by twinning and modification of the symmetry Cmcm↔ (1) over bar. An additional weak anomaly in the differential scanning calorimeter signal is found at T-02 approximate to 170K. The total thermal effect of both anomalies is = 3200 +/- 400 J/mol and Sigma Delta S-i = 16.5 +/- 2.0 J/mol K. The phase transition at T-01 is of the order-disorder type.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
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:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Laptash, N. M.; Мельникова, Светлана Владимировна
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16.

Investigation of the structure, physical properties, and phase transition in SrAlF5 / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 3. - P. 509-514, DOI 10.1134/S1063783410030108. - Cited References: 16. - This study was supported by the Russian Foundation for Basic Research (project no. 07-02-00442) and the Siberian Branch of the Russian Academy of Sciences within the framework of the Interdisciplinary Integration Project No. 34. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-STRUCTURE
   BEHAVIOR
   GROWTH
   SRAIF5
Аннотация: Crystals of SrAlF5 have been grown by the Bridgman method from the melt and by sintering of the components. Optical polarization studies and measurements of the thermal expansion and birefringence coefficients have been carried out over a wide temperature range. The electromechanical coefficient d (33) has been measured, and the optical second harmonic, dielectric hysteresis loop, and optical quality of the crystal have been assessed. X-ray diffraction investigations have been performed to identify the revealed compounds. It has been demonstrated that the SrAlF5 crystals obtained under the growth conditions chosen have I4(1)/a symmetry and do not undergo structural phase transitions in the temperature range 100-800 K. Crystalline inclusions of the AlOF oxyfluoride have been revealed in crystals grown with an AlF3 excess. The birefringence of the AlOF crystal is an order of magnitude higher than that of SrAlF5, does not depend on temperature, and has no anomalies up to 800 K.

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Держатели документа:
[Mel'nikova, S. V.
Gorev, M. V.
Vasil'ev, A. D.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Isaenko, L. I.
Lobanov, S. I.] Russian Acad Sci, Trofimuk United Inst Geol Geophys & Mineral, Siberian Branch, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Trofimuk United Institute of Geology, Geophysics, and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Koptyuga 3, Novosibirsk 630090, Russian Federation

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Isaenko, L. I.; Gorev, M. V.; Горев, Михаил Васильевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Lobanov, S. I.
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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.

Mel'nikova, S. V.
Phase transitions in orthorhombic oxyfluoride (NH4)(2)MoO2F4 / S. V. Mel'nikova, N. M. Laptash // Phys. Solid State. - 2008. - Vol. 50, Is. 3. - P. 511-514, DOI 10.1134/S1063783408030207. - Cited References: 15 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
(NH4)(2)WO2F4
Аннотация: (NH4)(2)MoO2F4 single crystals were grown and studied using polarization-optical methods, and the birefringence was measured in the temperature range 90-350 K. The following sequence of phase transitions is revealed: G(0) reversible arrow G(1) reversible arrow G(2). It is established that the phase transition at delta T-01 approximate to 267 K is of the first order and exhibits thermal hysteresis delta T-01 approximate to 0.6 K. A weak anomaly is found in Delta n(T) at T-02 approximate to 180 K. The crystals are shown to retain the orthorhombic symmetry during the phase transitions.

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Держатели документа:
[Mel'nikova, S. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН

Доп.точки доступа:
Laptash, N. M.; Мельникова, Светлана Владимировна
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19.

    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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20.

Magnetic anisotropy of nanocrystalline FeNi(P) columns electroless deposited in polycarbonate membranes / S. V. Komogortsev [et al.] // 58th Annual conference on мagnetism and мagnetic мaterials : abstacts. - 2013. - P. 580

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Доп.точки доступа:
Komogortsev, S. V.; Комогорцев, Сергей Викторович; Denisova, E. A.; Денисова, Елена Александровна; Chekanova, L. A.; Чеканова, Лидия Александровна; Bukaemskiy, A. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Chizhik, M. V.; Annual conference on мagnetism and мagnetic мaterials(58 ; 2013 ; 4-8 nov. ; Denver)
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