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Golovnev, N. N.
Crystal structures of cesium and rubidium 2-thiobarbiturates / N. N. Golovnev, M. S. Molokeev // Russ. J. Inorg. Chem. - 2014. - Vol. 59, Is. 9. - P. 943-946, DOI 10.1134/S003602361409006X. - Cited References: 13 . - ISSN 0036-0236. - ISSN 1531-8613

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
ACID
COLLECTION
Аннотация: The crystal structures of cesium 2-thiobarbiturate C4H3CsN2O2S (I) and rubidium 2-thiobarbiturate C4H3N2O2RbS (II) (C4H4N2O2S is 2-thiobarbituric acid, H2TBA) have been determined. Isostructural crystals are monoclinic; a = 7.9609(3) Å,b = 11.8474(3) Å, c = 7.7317(2) Å, β = 101.285(3)°, V = 715.13(4) Å3, space group C2/m, Z = 4 for I and a = 7.6369(2) Å, b = 11.7690(3) Å, c = 7.5568(2) Å, β = 100.212(1)°, V = 668.44(3) Å3, space group C2/m, Z = 4 for II. Each metal ion in complexes I and II is bonded to four oxygen atoms and two sulfur atoms at the vertices of a six-vertex polyhedron. N-H…O hydrogen bonds link HTBA-ions into chains. The structure is also stabilized by the “head-to-tail” π-π interaction of HTBA-ions.

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Публикация на русском языке

Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Головнёв, Николай Николаевич
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Study of structural and physical-properties of cesium and lithium double sulfate / K. S. Aleksandrov [и др.] // Fiz. Tverd. Tela. - 1980. - Vol. 22, Is. 12. - P. 3673-3677. - Cited References: 6 . - ISSN 0367-3294

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Публикация на русском языке Исследование структурных и физических свойств двойного сульфата и цезия и лития [Текст] / К. С. Александров [и др.] // Физ. тверд. тела. - 1980. - Т. 22 Вып. 12. - С. 3673-3677

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Zherebtsova, L. I.; Iskornev, I. M.; Искорнев, Игорь Михайлович; Kruglik, A. I.; Круглик, Анатолий Иванович; Rozanov, O. V.; Flerov, I. N.; Флёров, Игорь Николаевич
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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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Phase transitions in Cs2CdI4 single crystals / K. S. Aleksandrov [et al.] // Phys. Status Solidi A. - 1988. - Vol. 105, Is. 2. - P. 441-446 . - ISSN 0031-8965
Кл.слова (ненормированные):
CALORIMETRY -- CRYSTALS - Structure -- DIELECTRIC PROPERTIES -- OPTICAL PROPERTIES -- X-RAY ANALYSIS -- BIREFRINGENCE -- CESIUM CADMIUM IODIDE -- DIELECTRIC PERMEABILITY -- SPECIFIC HEAT -- SYMMETRY -- CESIUM COMPOUNDS
Аннотация: Cs//2CdI//4 crystals were grown from the melt (A) and from water solution (B). Optic, dielectric, X-ray, and calorimetric investigations were carried out. Crystal A shows three phase transitions at 332. 3, 259. 6, and 183. 4 K with the following sequence of phases: commensurate orthorhombic of beta -K//2SO//4 type ( alpha //0 equals 1. 074, b//0 equals 0. 8458, c equals 1. 4852 nm) B ARR LR incommensurate B ARR LR monoclinic ferroelastic (P2//1/n) B ARR LR triclinic ferroelastic (P1 OVER BAR ). The B-crystal belongs to monoclinic symmetry (P2//1/m) and undergoes transformation into the orthorhombic phase of beta -K//2SO//4 type at 420 K.

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Держатели документа:
USSR Acad of Sciences, Krasnoyarsk, USSR, USSR Acad of Sciences, Krasnoyarsk, USSR

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Melnikova, S. V.; Мельникова, Светлана Владимировна; Flerov, I. N.; Флёров, Игорь Николаевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Kruglik, A. I.; Круглик, Анатолий Иванович; Kokov, I. T.
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Prokert, F.
Neutron scattering studies on phase transition and phonon dispersion in Cs//2NaBiCl//6 / F. Prokert, K. S. Aleksandrov // Phys Status Solidi B. - 1984. - Vol. 124, Is. 2. - P. 503-513, DOI 10.1002/pssb.2221240208. - Cited References: 24 . - ISSN 0370-1972
Кл.слова (ненормированные):
NEUTRONS - Scattering -- PHONONS -- PHASE TRANSITION -- PHONON DISPERSION -- CESIUM COMPOUNDS
Аннотация: The structural phase transition (PT) of elpasolite-type crystal Cs//2NaBiCl//6 is investigated by neutron scattering. At first the acoustic phonon dispersion is measured at room temperature for the high-symmetric directions DELTA , SIGMA , and LAMBDA of the Brillouin zone. The transverse rotary mode is studied for phonon wave vectors q parallel as well as perpendicular to DELTA and the dispersion shows a quasi-two-dimensional behavior of the Cl-octahedra rotation. At cooling down to the PT, this branch shows a softening along DELTA , reaching the lowest energies at the zone center. The PT, which is found to be of weakly first order, seems to be driven and triggered by the ferrorotative octahedra mode.

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

Доп.точки доступа:
Aleksandrov, K. S.; 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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Aleksandrov, K. S.
Spectroscopic investigation of phase transitions in CsLiMoO//4 crystals. / K. S. Aleksandrov, Yu. N. Ivanov, A. D. Schafer // Ferroelectrics. - 1983. - Vol. 55, Is. 1. - P. 671-674 . - ISSN 0015-0193
Кл.слова (ненормированные):
CRYSTALS - Structure -- MAGNETIC RESONANCE -- SPECTROSCOPY, RAMAN -- CESIUM LITHIUM MOLYBDATE -- PHASE TRANSITIONS -- FERROELECTRIC MATERIALS
Аннотация: Raman and NMR spectra in cubic and two distorted phases of CsLiMoO//4 have been studied. Phase transitions in the crystal are shown to belong to order-disorder type.

Scopus

Доп.точки доступа:
Ivanov, Y. N.; Иванов, Юрий Николаевич; Schafer, A. D.; Александров, Кирилл Сергеевич; European Meeting on Ferroelectricity(5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp)
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Investigation of ferroelectric phase transitions in CsLiMoO//4 type crystals / K. S. Aleksandrov [et al.] // Ferroelectrics. - 1983. - Vol. 54, Is. 1. - P. 573-576 . - ISSN 0015-0193
Кл.слова (ненормированные):
CALORIMETRY -- CESIUM COMPOUNDS - X-Ray Analysis -- PHASE TRANSITIONS -- FERROELECTRIC MATERIALS
Аннотация: X-ray and calorimetric investigations of successive phase transitions (PTs) in crystals of CsLiMoO//4 type were made. The theoretical model description of these PTs as of order-disorder type ones is suggested and thermodynamical properties of the model are discussed.

Scopus

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Blat, D. H.; Zinenko, V. I.; Зиненко, Виктор Иванович; Iskornev, I. M.; Kruglik, A. I.; Flerov, I. N.; Флёров, Игорь Николаевич; European Meeting on Ferroelectricity(5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp)
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Investigation of structural and physical properties of cesium-lithium double sulfate / K. S. Aleksandrov [и др.] // Sov. Phys. Solid State. - 1980. - Vol. 22, Is. 12. - P. 2150-2152 ; Phys. Solid State . - ISSN 0584-5807
Кл.слова (ненормированные):
LITHIUM COMPOUNDS -- FERROELASTICITY -- PHASE TRANSITIONS -- CESIUM COMPOUNDS
Аннотация: A study was made of the temperature dependences of the integrated intensities of the 006 and 021 x-ray reflections, deviation of the angle gamma from 90 degree , NMR of **7Li, specific heat c//p, thermal expansion, and permittivity. Moreover, the effects of hydrostatic pressure on the phase transition were studied. It was definitely established that a ferroelastic phase transition of the second kind occurs at 202. 07 degree K and this transition does not alter the number of atoms in a unit cell.

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Доп.точки доступа:
Aleksandrov, K. S.; Zherebtsova, L. I.; Iskornev, I. M.; Kruglik, A. I.; Rozanov, O. V.; Flerov, I. N.

}
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10.

    Synthesis, structural and spectroscopic properties of acentric triple molybdate Cs2NaBi(MoO4)3 / A. A. Savina [et al.] // J. Solid State Chem. - 2015. - Vol. 225. - P. 53–58, DOI 10.1016/j.jssc.2014.11.023. - Cited References: 66. - The authors are grateful to Dr. K.M. Khal'baeva and Dr. Irina A. Gudkova for their assistance in preparing the compound and taking X-ray single-crystal diffraction data. This study is partly supported by the Russian Foundation for Basic Research (Grants 13-03-01020 and 14-03-00298). V.V.A., A.S.K. and A.S.O. gratefully acknowledge the Ministry of Education and Science of the Russian Federation for a partial financial support. . - ISSN 0022-4596. - ISSN 1095-726X
   Перевод заглавия: Синтез, структурные и спектроскопические свойства ацентричного тройного молибдата Cs2NaBi(MoO4)3

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
CRYSTAL-STRUCTURE
   SINGLE-CRYSTALS
   VIBRATIONAL PROPERTIES
   RAMAN-SPECTROSCOPY
   HYDROTHERMAL SYNTHESIS
   DIELECTRIC-PROPERTIES
   SELECTIVE OXIDATION;
   BISMUTH MOLYBDATES
   IONIC-CONDUCTIVITY
   OPTICAL-PROPERTIES
Кл.слова (ненормированные):
Triple molybdate -- Sodium -- Cesium -- Bismuth -- Crystal structure -- Raman spectroscopy -- CRYSTAL-STRUCTURE -- SINGLE-CRYSTALS -- VIBRATIONAL PROPERTIES -- RAMAN-SPECTROSCOPY -- HYDROTHERMAL SYNTHESIS -- DIELECTRIC-PROPERTIES -- SELECTIVE OXIDATION; -- BISMUTH MOLYBDATES -- IONIC-CONDUCTIVITY -- OPTICAL-PROPERTIES
Аннотация: New ternary molybdate Cs2NaBi(MoO4)3 is synthesized in the system Na2MoO4–Cs2MoO4–Bi2(MoO4)3. The structure of Cs2NaBi(MoO4)3 of a new type is determined in noncentrosymmetric space group R3c, a=10.6435(2), c=40.9524(7) Å, V=4017.71(13) Å3, Z=12 in anisotropic approximation for all atoms taking into account racemic twinning. The structure is completely ordered, Mo atoms are tetrahedrally coordinated, Bi(1) and Bi(2) atoms are in octahedra, and Na(1) and Na(2) atoms have a distorted trigonal prismatic coordination. The Cs(1) and Cs(2) atoms are in the framework cavities with coordination numbers 12 and 10, respectively. No phase transitions were found in Cs2NaBi(MoO4)3 up to the melting point at 826 K. The compound shows an SHG signal, I2w/I2w(SiO2)=5 estimated by the powder method. The vibrational properties are evaluated by Raman spectroscopy, and 26 narrow lines are measured.

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Держатели документа:
SB RAS, Baikal Inst Nat Management, Lab Oxide Syst, Ulan Ude 670047, Russia.
Buryat State Univ, Dept Chem, Ulan Ude 670000, Russia.
SB RAS, Rzhanov Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia.
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia.
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia.
SB RAS, Nikolaev Inst Inorgan Chem, Lab Crystal Chem, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Dept Nat Sci, Novosibirsk 630090, Russia.
SB RAS, Kirensky Inst Phys, Lab Mol Spectroscopy, Krasnoyarsk 660036, Russia.
SB RAS, Nikolaev Inst Inorgan Chem, Lab Epitaxial Layers, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Lab Res Methods Composit & Struct Funct Mat, Novosibirsk 630090, Russia.
SB RAS, Kirensky Inst Phys, Lab Crystal Struct, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Photon & Laser Technol, Krasnoyarsk 660079, Russia.
SB RAS, Inst Automat & Elect, Lab Condenced Matter Spectroscopy, Novosibirsk 630090, Russia.

Доп.точки доступа:
Savina, A. A.; Atuchin, V. V.; Solodovnikov, S. F.; Solodovnikova, Z. A.; Krylov, A. S.; Крылов, Александр Сергеевич; Maximovsky, E. A.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Pugachev, A. M.; Khaikina, E. G.; Russian Foundation for Basic Research [4828.2012.2, 12-02-31205]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [8379]
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