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1.


   
    (NH4)3HfF7: Crystallooptical and calorimetric studies of a number of successive phase transitions / E. Pogoreltsev [et al.] // J. Fluor. Chem. - 2017. - Vol. 204. - P. 45-49, DOI 10.1016/j.jfluchem.2017.10.004. - Cited References: 14 . - ISSN 0022-1139
   Перевод заглавия: (NH4)3HfF7: Кристаллооптические и калориметрические исследования ряда последовательных фазовых переходов
Аннотация: Single crystals of (NH4)3HfF7 were grown. Polarising optical observations as well as measurement of the heat capacity and birefringence Δn(Т) were performed in the temperature range of 200–310 K. Reversible phase transitions at temperatures T0 = 290 K, Т1 = 280.5 K, Т2 ≈ 273 K, Т3 = 266 K, Т4 = 259 K, Т5 = 231 K, Т6 = 229 K were found. Observations in polarised light make it possible to suggest a sequence of changes in the symmetry groups for these transitions: Fm3m ⟵Т0→ cub. ⟵Т1→ mmm (1) ⟵Т2→ mmm (2) ⟵Т3→ mmm (3) ⟵Т5→ 2/c. The T-p phase diagram was studied and the temperature boundaries of the stability of the distorted crystalline phases were determined. A significant change of the entropy at successive phase transitions ΣΔS = 10.6 J/mol K indicates a disordering of the initial cubic phase.

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

Доп.точки доступа:
Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Melnikova, S.V.; Мельникова, Светлана Владимировна; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
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2.


    Melnikova, S. V.
    Birefringes and structure phase-transitions in ABCl3 perovskites / S. V. Melnikova, A. T. Anistratov, K. S. Aleksandrov // Fiz. Tverd. Tela. - 1981. - Vol. 23, Is. 1. - P. 246-250. - Cited References: 16 . - ISSN 0367-3294

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Публикация на русском языке Мельникова, Светлана Владимировна. Двупреломление и структурные фазовые переходы в ABCl3 перовскитах [Текст] / С. В. Мельникова, А. Т. Анистратов, К. С. Александров // Физ. тверд. тела. - 1981. - Т. 23 Вып. 1. - С. 246-249


Доп.точки доступа:
Anistratov, A. T.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Мельникова, Светлана Владимировна
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3.


    Melnikova, S. V.
    CS2CDI4 and CS2ZNI4 crystals with incommensurate phases / S. V. MELNIKOVA, S. V. PRIMAK // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 7. - P. 2173-2177. - Cited References: 7 . - ISSN 0367-3294
РУБ Physics, Condensed Matter


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Доп.точки доступа:
PRIMAK, S. V.; Мельникова, Светлана Владимировна
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4.


    Melnikova, S. V.
    Dispersion of optical-properties of A4CDX6 trigonal crystals / S. V. Melnikova, T. N. Davydova // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 7. - P. 2094-2097. - Cited References: 8 . - ISSN 0367-3294
РУБ Physics, Condensed Matter


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Доп.точки доступа:
Davydova, T. N.; Мельникова, Светлана Владимировна
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5.


   
    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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6.


   
    Effect of the K↔Rb sub?stitution on structure and phase transition in mixed KxRb1-xPb2Br5 crystals [Text] / L. I. Isaenko, A. A. Merkulov [et al.] // Cryst. Growth and Design. - 2009. - Vol. 9, № 5. - P2248-2251


Доп.точки доступа:
Isaenko, L.I.; Merkulov, A.A.; Melnikova, S.V.; Pashkov, V.M.; Tarasova, A.Yu.
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7.


    MELNIKOVA, S. V.
    ELECTROOPTICAL PROPERTIES OF SOME ABCL3 PEROVSKITE STRUCTURE TYPE CRYSTALS / S. V. MELNIKOVA, A. T. ANISTRATOV // Fiz. Tverd. Tela. - 1984. - Vol. 26, Is. 6. - P. 1906-1908. - Cited References: 6 . - ISSN 0367-3294
РУБ Physics, Condensed Matter


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Доп.точки доступа:
ANISTRATOV, A. T.
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8.


   
    Features of the melt–solution synthesis of the TbCr3(BO3)4 single crystals / I. A. Gudim, N. V. Mikhashenok, A. D. Vasiliev [et al.] // J. Cryst. Growth. - 2024. - Vol. 637-638. - Ст. 127716, DOI 10.1016/j.jcrysgro.2024.127716. - Cited References: 22. - The authors thank A.V. Zamkov for assistance in preparing the samples for the conoscopic study. The characterization and examination of the samples were performed at the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. - This study was supported in part by the Russian Science Foundation and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 22-12-20019 . - ISSN 0022-0248. - ISSN 1873-5002
Кл.слова (ненормированные):
Growth from melt-solution -- Single crystal growth -- Cromium borates -- Rare-earth compounds -- Oxides -- Magnetic materials
Аннотация: The phase formation of terbium chromoborate TbCr3(BO3)4 in the bismuth trimolybdate and lithium tungstate melt–solutions has been studied. The absence of the terbium chromoborate trigonal phase in the bismuth trimolybdate-based system at all component ratios has been shown. The component ratio in the lithium tungstate-based system has been found at which the TbCr3(BO3)4 trigonal crystals are formed at temperatures above 1100 °C; below this temperature, the monoclinic phase dominates. The structural and magnetic properties of the grown crystals have been studied. It has been established that the trigonal and monoclinic TbCr3(BO3)4 crystals synthesized from the lithium tungstate-based solvent exhibit identical magnetic properties. At the same time, a significant difference of the magnetic properties of the single crystals synthesized from the bismuth molybdate melt–solution has been observed. This difference has been attributed to the effect of Bi3+ ions that partially replace Tb3+ ions.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036 Russia

Доп.точки доступа:
Gudim, I. A.; Гудим, Ирина Анатольевна; Mikhashenok, N. V.; Михашенок, Наталья Владимировна; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Melnikova, S. V.; Мельникова, Светлана Владимировна; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Pankrats, A. I.; Панкрац, Анатолий Иванович
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9.


   
    Ferroelastic phase transition in Cs3Bi2I9 crystal / S. V. Melnikova [et al.] // Ferroelectrics, Letters Section. - 1996. - Vol. 20, Is. 5-6. - P. 163-167 . - ISSN 0731-5171
Кл.слова (ненормированные):
Birefringence -- Cesium compounds -- Crystal symmetry -- Crystals -- Differential scanning calorimetry -- Elasticity -- Ferroelectricity -- Permittivity -- Stiffness -- Twinning -- Cesium bismuth iodide -- Elastic constant -- Elastic stiffness -- Ferroelastic phase transition -- Phase transitions
Аннотация: Phase transition (PT) was found in Cs3Bi2I9 single crystal at T0=223 K. Optical birefringence, dielectric and elastic constants and differential scanning calorimetry have been studied. It was found that birefringence ?nc and twinning picture appeared on (001) - and (100) - plates below T0, as well as softening of elastic stiffness C44 above T0. It allows to classify the PT as proper ferroelastic one with symmetry change 6/mmm - 2/m. В© 1996 OPA (Overseas Publishers Association) Amsterdam B.V. Published in The Netherlands under license by Gordon and Breach Science Publishers SA.

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Доп.точки доступа:
Melnikova, S. V.; Мельникова, Светлана Владимировна; Shabanova, L. A.; Zaitsev, A. I.; Зайцев, Александр Иванович; Parshikov, S. A.; Ageev, O. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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10.


    Melnikova, S. V.
    Ferroelectric phase transition in Cs3Bi2I9 / S. V. Melnikova, A. I. Zaitsev // Phys. Solid State. - 1997. - Vol. 39, Is. 10. - P. 1652-1654, DOI 10.1134/1.1129882. - Cited References: 7 . - ISSN 1063-7834
РУБ Physics, Condensed Matter

Аннотация: Single crystals of Cs3Bi2I9 have been grown. Polarized-optical, dielectric, and calorimetric studies have been performed, along with measurements of birefringence, and the coefficients of elasticity c(44), and linear expansion alpha over a wide temperature range. It is found that an intrinsic (pseudo-intrinsic) second-order phase transition to the ferroelastic phase takes place at T-0=220.0+/-0.6 K accompanied by a change of the crystal symmetry from 6/mmc to 2/m. The transition parameter depends linearly on the shear strain x(5) and varies with temperature according to a power law with exponent beta=0.5. (C) 1997 American Institute of Physics.

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Держатели документа:
L. V. Kirenskii Inst. of Phys., Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН

Доп.точки доступа:
Zaitsev, A. I.; Зайцев, Александр Иванович; Мельникова, Светлана Владимировна
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