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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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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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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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Mel'nikova, S. V.
A study of the effect of gradual substitution NH4 - Cs on phase transitions in NH4LiSO4 crystals / S. V. Mel'nikova, V. A. Grankina, A. V. Kartashev // Phys. Solid State. - 2002. - Vol. 44, Is. 2. - P. 379-385, DOI 10.1134/1.1451032. - Cited References: 22 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MIXED-CRYSTALS
   TEMPERATURE PHASE
   LINH4SO4
   BIREFRINGENCE
   SULFATE
   RAMAN
Аннотация: Solid solutions in the Cs-x(NH4)(1 - x)LiSO4 (0 less than or equal to x less than or equal to 0.35) system are grown and investigated. The birefringence (n(a) - n(b)) and the heat capacity are measured in the temperature range 100-530 K. The (x-T) phase diagram is constructed. It is demonstrated that the substitution of cesium for ammonium in the NH4LiSO4 crystal affects the transition temperatures in such a way that the region of the ferroelectric phase increases and the ferroelastic phase disappears at x 0.22. The character of the high-temperature transition remains unchanged (2beta = 0.24 +/- 0.01 for all compositions), but the birefringence anomaly and enthalpy decrease. As the concentration x increases, the low-temperature transition becomes more similar to a first-order transition: the birefringence jump deltan and the temperature hysteresis DeltaT increase. (C) 2002 MAIK "Nauka/Interperiodica".

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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:
Grankina, V. A.; Kartashev, A. V.; Карташев, Андрей Васильевич; Мельникова, Светлана Владимировна
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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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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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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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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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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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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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11.

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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12.

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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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.

Investigation of the reconstructive phase transition between metastable (alpha) and stable (beta) modifications of the NH4LiSO4 crystal / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2003. - Vol. 45, Is. 8. - P. 1572-1578, DOI 10.1134/1.1602898. - Cited References: 13 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
AMMONIUM LITHIUM-SULFATE
LINH4SO4
TEMPERATURE
Аннотация: Crystals of ammonium lithium sulfate NH4LiSO4 in alpha and beta modifications are studied, and conditions of their nucleation and growth are determined. The alpha modification of NH4LiSO4 and alpha--beta phase transitions are investigated using polarized light microscopy, x-ray diffraction, and differential scanning calorimetry in the temperature range 80-530 K. It is found that, depending on the conditions of growth and storage, there exist two temperature ranges (T(alpha--beta)approximate to340-350 and approximate to440-450 K) in which the crystals can undergo an alpha--beta reconstructive phase transition. The enthalpy of this transformation depends on the symmetry of the final phase. In the former case (340-350 K), the reconstructive phase transition leads to rapid destruction of the sample. In the latter case (440-450 K), the crystal structure undergoes a slow transformation (recrystallization) without noticeable distortions. The results obtained indicate that no structural phase transition occurs in the alpha modification of NH4LiSO4 at 250 K. (C) 2003 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, 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:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Kartashev, A. V.; Карташев, Андрей Васильевич; Grankina, V. A.; Flerov, I. N.; Флёров, Игорь Николаевич
}
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15.

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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16.

Мельникова, Светлана Владимировна.
Оптические исследования фазовой (T-x)-диаграммы твердых растворов оксифторидов (NH4)2MoO2F4-Rb2MoO2F4 / С. В. Мельникова, Н. М. Лапташ // Физ. тверд. тела. - 2015. - Т. 57, Вып. 6. - С. 1180-1184. - Библиогр.: 8. - Работа выполнена при финансовой поддержке гранта Президента РФ для поддержки ведущих научных школ РФ (НШ-924.2014.2). . - ISSN 0367-3294
Аннотация: Выращены монокристаллы твердых растворов (NH4)2-xRbxMoO2F4 (включая индивидуальный комплекс Rb2MoO2F4). Проведено их исследование методами поляризационной оптики. Измерено двупреломление Δn(T) в интервале температур 100-400 K. Построена полная фазовая (T-x)-диаграмма твердых растворов.

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Переводная версия Mel'nikova S. V. Optical studies of the (T-x) phase diagram of oxyfluoride (NH4)2MoO2F4-Rb2MoO2F4 solid solutions [Текст] / S. V. Mel'nikova, N. M. Laptash // Phys. Solid State : MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57 Is. 6.- P.1201-1205

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Лапташ, Н. М.; Mel'nikova, S. V.
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17.

Thermal, structural, optical, dielectric and barocaloric properties at ferroelastic phase transition in trigonal (NH4)2SnF6: A new look at the old compound / I. N. Flerov [et al.] // J. Fluor. Chem. - 2016. - Vol. 183. - P. 1-9, DOI 10.1016/j.jfluchem.2015.12.010. - Cited References: 25. - The reported study was partially supported by RFBR, research project No. 15-02-02009a. . - ISSN 0022-1139

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
Heat-capacity
   Ammonium
   (NH4)3TiF7
   Pressure
Кл.слова (ненормированные):
Fluorides -- Structural disorder -- Phase transitions -- Entropy -- Barocaloric effect
Аннотация: Structural phase transition P-3m1 → P-1 of the first order and nonferroelectric nature was found in (NH4)2SnF6 at about 110 K in the process of thermal, optical, dielectric and X-ray studies. Order-disorder transformation is accompanied by large changes of entropy (ΔS0 = 16.4 J/mol K) and volume (ΔV0/V ≈ 1%). The structural model associated with three orientations of NH4 tetrahedra in P-3m1 phase and their complete ordering in P-1 phase was suggested with the entropy change (ΔS0 = 18.3 J/mol K) close to the experimental value. A good agreement between baric coefficients measured in a direct way (dT0/dp = -157 K/GPa) and evaluated using entropy and volume changes at phase transition (-170 K/GPa) was found. Barocaloric effects in (NH4)2SnF6 are comparable with those of known solid state refrigerants and are characterised by a low-pressure need for realising their maximum values. © 2015 Elsevier B.V. All rights reserved.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of RAS, Akademgorodok 50, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian State University, Krasnoyarsk, Russian Federation
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, Khabarovsk, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Laptash, N. M.
}
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18.

    Birefringence, twinning and structural phase transitions in ABCl3 single crystals / K. S. Aleksandrov, A. T. Anistratov [и др.] // Ferroelectrics. - 1978. - Vol. 20, Spesial issue. - P. 305-307DOI 10.1080/00150197808237245
   Перевод заглавия: Двулучепреломление, двойникование и структурные фазовые переходы в кристаллах ABCl3
Аннотация: The temperature investigations of birefringence, twinning and elasticity of CsPbCl3, CsSrCl3, TlMnCl3, RbCdCl3, CsCaCl3 and RbMnCl3, were carried out. A group-theoretical analysis is made and the description of phase transitions is given.

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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Anistratov, A. T.; Анистратов, Анатолий Тихонович; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Zinenko, V. I.; Зиненко, Виктор Иванович; Shabanova, L. A.; Beznosikov, B. V.; Безносиков, Борис Валерьевич; International meeting on ferroelectricity(4 ; 1977 ; 18-23 Sept. ; Leningrad)
}
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19.

    Structural transformation between two cubic phases of (NH4)3SnF7 / I. N. Flerov [et al.] // J. Fluor. Chem. - 2015. - Vol. 178. - P. 86-92, DOI 10.1016/j.jfluchem.2015.06.024. - Cited References: 19. - We thank T.A. Kaidalova for the idea of doubling the unit cell parameter of (NH4)3SnF7 at room temperature. The reported study was partially supported by RFBR, research project No. 15-02-02009 a. . - ISSN 0022-1139
   Перевод заглавия: Структурный переход между двумя кубическими фазами в (NH4)3SnF7

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
CRYSTAL-STRUCTURE
TRANSITION
NH4F
Кл.слова (ненормированные):
Cubic fluorides -- Phase transitions -- X-ray -- Calorimetry -- Crystal optics
Аннотация: Reinvestigations of the room temperature structure of ammonium heptafluorostannate (NH4)3SnF7 = (NH4)2SnF6·NH4F = (NH4)3[SnF6]F by both powder and single crystal X-ray diffractions have revealed that its real symmetry is Pa−3 (Z = 8) instead of Pm−3m (Z = 1) suggested earlier. Polarizing optical observations, heat capacity, X-ray powder, and single crystal measurements were performed in a wide temperature range (100–420 K). A reversible structural phase transition of the first order between two cubic modifications Pa−3 ↔ Pm−3m was found at about T0 = 360 K. The structural models associated with partially disordered and totally ordered high and low temperature phases, respectively, comply with a large value of phase transition entropy.

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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, Khabarovsk, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Laptash, N. M.; Udovenko, A. A.; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Misyul, S. V.; Мисюль, Сергей Валентинович
}
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20.

Синтез и исследование магнитных композиционных материалов на основе пористых матриц с различной морфологией пор [Текст] / Е. А. Денисова [и др.] // Фазовые переходы, межфазные границы и наноматериалы : электронный журнал. - 2014. - Вып. 3. - С. 92-94. - Библиогр.: 5 назв. - Работа выполнена при поддержке РФФИ проект № 13-03-00476 . - ISSN 2073-0373
Кл.слова (ненормированные):
нанокластеры
Аннотация: Методом химического осаждения синтезированы композиционные материалы на основе различных матриц (пористый кремний, трековые мембраны, активированный уголь, МСМ-41) с порами, заполненными частицами сплава Со(Р). Исследованы структурные и магнитные характеристики композитов. Установлено, что морфология пор определяет величину поля локальной анизотропии и коэрцитивной силы композитов.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Денисова, Елена Александровна; Denisova, E. A.; Исхаков, Рауф Садыкович; Iskhakov, R. S.; Чеканова, Лидия Александровна; Chekanova, L. A.; Мельникова, Светлана Владимировна; Mel'nikova, S. V.
}
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