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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.
X-ray and optic investigations of phase-transition in cslicro4 crystal / K. S. Aleksandrov, S. V. Mel'nikova, A. I. Kruglik // Ferroelectrics. - 1988. - Vol. 81, Is. 1. - P. 153-156, DOI 10.1080/00150198808008833. - Cited References: 2 . - ISSN 0015-0193

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter

Аннотация: The study of optical properties and X-ray investigations were carried out in CsLiCrO4crystal. It was found (is discussed) an unusual 4 temperature dependence of optical indicatrix rotation and monoclinic angles.

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Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Kruglik, A. I.; Александров, Кирилл Сергеевич
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Birefringence and structural phase transitions in ABCl//3-type crystals / C. V. Mel'nikova [и др.] // Sov. Phys. Solid State. - 1977. - Vol. 19, Is. 1. - P. 18-20 ; Phys. Solid State
Кл.слова (ненормированные):
ELECTROOPTICAL EFFECTS -- CRYSTALS
Аннотация: The refractive indices and birefringence of CsPbCl//3, TlMnCl//3, and CsSrCl//3 were determined a wide temperature range, which included phase transition points. Relatively high values of the photoelastic and acoustooptic characteristics were obtained: the th acoustooptic figure of merit M//2 was 12 multiplied by (times) 10** minus **1**8 cgs units for TlMnCl//3 and 98 multiplied by (times) 10** minus **1**8 cgs units for CsPbCl//3. A strong influence of partial Sr for Ca substitution on the properties and transition temperatures was observed. A phenomenological theory was used to analyze the relationship between the birefringence anomalies and the theromodynamic parameters of the transitions. A comparison was made with KMnF//3 and SrTiO//3.

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Публикация на русском языке Двупреломление и структурные фазовые переходы в кристаллах типа ABCl3 [Текст] / С. В. Мельникова [и др.] // Физ. тверд. тела. - 1977. - Т. 19 Вып. 1. - С. 34-38

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Anistratov, A. T.; Beznosikov, B. V.; Безносиков, Борис Валерьевич

}
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    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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Composite magnetic materials based on porous templates with different pores morphology: synthesis and magnetic properties [Текст] / L. A. Chekanova // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism : abstracts. - Vladivostok : FEFU, 2013. - P169 . - ISBN 978-5-7444-3124-2

Доп.точки доступа:
Chekanova, L. A.; Чеканова, Лидия Александровна; Denisova, E. A.; Денисова, Елена Александровна; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)
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Effect of the size of the central atom on the stability of crystalline phases in solid solutions (NH4)3TixSn1-xF7 / E. V. Bogdanov, E. I. Pogoreltsev, M. V. Gorev [et al.] // J. Solid State Chem. - 2023. - Vol. 328. - Ст. 124373, DOI 10.1016/j.jssc.2023.124373. - Cited References: 20. - The study was supported by a grant from the Russian Science Foundation № 23-22-00115, https://rscf.ru/project/23-22-00115/. - X-ray and dilatometric data and SEM images were obtained using the equipment of the Krasnoyarsk Regional Center for Collective Use of the Federal Research Center — Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences. We are grateful to Dr. A.V. Shabanov for examination of the SEM images . - ISSN 0022-4596. - ISSN 1095-726X
Кл.слова (ненормированные):
Phase transition -- Fluorides -- Heat capacity -- Entropy -- Thermal expansion -- Birefringence -- Solid solution -- Internal pressure
Аннотация: The effect of a change in internal pressure as a result of partial substitution of the central atom on the realization and stability of the initial and distorted crystalline phases in (NH4)3TixSn1-xF7 solid solutions has been studied. It was found that at a Ti concentration in the range of x = 0.15–0.40, the reconstructive transition Pm-3m ↔ Pa-3 is transformed into a sequence of phase transitions Pm-3m ↔ P4/mbm ↔ P4/mnc ↔ Pa-3. In the (NH4)3Ti0.15Sn0.85F7 solid solution, the first-order phase transition between two cubic phases at T0 = 352 K is characterized by a significant volume jump δ(ΔV/V0) ≈ 1 %, comparable with that in (NH4)3SnF7. An increase of the Ti concentration leads to a strong decrease in the stability of the Pm-3m cubic phase: the first tetragonal P4/mbm phase appears in (NH4)3Ti0.4Sn0.6F7 at T0 = 400 K, which proves the existence of the predicted high-temperature cubic phase in (NH4)3TiF7. In solid solutions, a decrease in birefringence and entropy of phase transitions was observed in comparison with the initial compounds with Sn and Ti as central atoms. The role of critical parameters (unit cell volume, temperature, external pressure) in the formation of cubic and distorted phases is discussed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036, Krasnoyarsk, Russia
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, 660049, Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660074, Krasnoyarsk, Russia
Institute of Chemistry, Far Eastern Department of RAS, 690022, Vladivostok, Russia

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Gorev, M. V.; Горев, Михаил Васильевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Laptash, N. M.; Flerov, I. N.; Флёров, Игорь Николаевич
}
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Ferroelastic phase transitions in (NH4)2TaF7 / E. I. Pogoreltsev [et al.] // Phys. Sol. St. - 2013. - Vol. 55, Is. 3. - P. 611-618DOI 10.1134/S1063783413030232
Аннотация: The heat capacity, unit cell parameters, permittivity, optical properties, and thermal expansion of the (NH4)2TaF7 compound with a seven coordinated anion polyhedron have been measured. It has been found that the compound undergoes two successive phase transitions with the symmetry change: tetragonal (T1 = 174 K) orthorhombic (T2 = 156 K) tetragonal. The ferroelastic nature of structural transformations has been established, and their entropy and susceptibility to hydrostatic pressure have been determined.

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Публикация на русском языке Сегнетоэластические фазовые переходы в (NH4)2TaF7 // Физика твердого тела. - 2013. - Т. 55, Вып. 3. - С. 555-561

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia
Russian Acad Sci, Far Eastern Branch, Inst Chem, Vladivostok 690022, Russia

Доп.точки доступа:
Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Kartashev, A. V.; Карташев, Андрей Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
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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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Influence of the molecular groups ordering on structural phase transitions in (NH4)2WO2F4 crystal / A. S. Krylov [et al.] // Cryst. Growth Des. - 2014. - Vol. 14, Is. 1. - P. 374-380, DOI 10.1021/cg400899m. - Cited References: 27. - This work was partly supported by the Russian Foundation for the Basic Research project no. 12-02-00056, no. 13-02-00825, and integration project SB RAS no. 28, SS-4828.2012.2. - Published as part of the Crystal Growth & Design virtual special issue Anion-controlled New Inorganic Materials. . - ISSN 1528-7483. - ISSN 1528-7505

РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary
Рубрики:
RAMAN-SCATTERING
   NEUTRON-SCATTERING
   SOLID-STATE
   OXYFLUORIDES
   DISORDER
   POLAR
   ANION
Аннотация: Phase transitions of the (NH4)2WO2F 4 crystal were studied by Raman spectroscopy in the range from 10 to 350 K. The mechanism of two phase transitions at T1 = 201 and T 2 = 160 K was proposed. The significant spectra changes occur in the range corresponding to the W-O vibrations. The first temperature phase transition is due to the ordering of the quasi-octahedral groups [WO 2F4]2- and partial ordering of ammonium groups. Experimental data allow for attributing the first (T1 = 201 K) phase transition to the first order close to the tricritical point. The noticeable changes of the Raman spectrum have been found in the range corresponding to the ammonium vibrations below the temperature T2. The second phase transition is associated with the further ordering of ammonium groups. Room temperature (296 K) experiments have been carried out under high hydrostatic pressure up to 10 GPa. Above 2 GPa, new spectral features appear, allowing for the assumption of the existence of a new high-pressure phase of (NH 4)2WO2F4, which is mainly connected with ordering of the [WO2F4]2- quasi-octahedral groups.

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Держатели документа:
Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Inst Geol & Mineral SB RAS, Novosibirsk 630090, Russia
Inst Chem FEB RAS, Vladivostok 690022, Russia

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Goryainov, S. V.; Laptash, N. M.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Krylova, S. N.; Крылова, Светлана Николаевна
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10.

Investigation into phase diagrams of the fluorine–oxygen system: ferroelastic–antiferroelectric (NH4)2WO2F4–(NH4)2MoO2F4 / E. V. Bogdanov [et al.] // Phys. Sol. St. - 2013. - Vol. 55, Is. 2. - P. 409-418DOI 10.1134/S1063783413020042
Аннотация: Thermal, physical, structural, optical, and dielectric investigations have been performed for oxy- fluoride solid solutions (NH4)2W1–xMoxO2F4 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1). The character of the influence of the chemical and hydrostatic pressures on the stability of the parent (space group Cmcm) and dis& torted ferroelastic and antiferroelectric phases has been determined by analyzing the temperature–pressure, unit cell volume–composition, and temperature–composition phase diagrams. The specific features of the nature and mechanism of the phase transitions have been discussed using the available data on the structural, entropy, and dielectric parameters.

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Публикация на русском языке Исследование фазовых диаграмм фторкислородной системы сегнетоэластик--антисегнетоэлектрик (NH4)2WO2F4--(NH4)2MoO2F4 // Физика твердого тела. - 2013. - Т. 55, Вып. 2. - С. 366-374

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660074, Russia
Russian Acad Sci, Far Eastern Branch, Inst Chem, Vladivostok 690022, Russia
Krasnoyarsk State Agr Univ, Inst Energet & Power Resources Management, Krasnoyarsk 660049, Russia

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