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Makarova, I. P.
Structure and twinning of RbLiCrO4 crystals / I. P. Makarova, I. A. Verin, K. S. Aleksandrov // Acta Crystallogr. B. - 1993. - Vol. 49. - P. 19-28, DOI 10.1107/S0108768192006141. - Cited References: 14 . - ISSN 0108-7681

РУБ Crystallography
Рубрики:
LITHIUM POTASSIUM-SULFATE
   NEUTRON-DIFFRACTION
   THERMAL VIBRATIONS
   KLISO4
   PROGRAM
   LIKSO4
Аннотация: The crystal structures of the G3 (space group P31c) and G2 (space group P6(3)) phases of RbLiCrO4 have been determined from X-ray diffraction data (Mo Kalpha radiation) at 293, 428, 493 and 523 K (G3 phase) and 553 and 583 K (G2 phase). The RbLiCrO4 crystals exhibit twinning by merohedry with twin laws in the G3 phase: 2 parallel-to [001], m perpendicular-to [001], 1BAR; in the G2 phase: m parallel-to [001], 2 perpendicular-to [001], 1BAR. The analysis of diffraction intensities and influence of anomalous scattering on them provided the unambiguous determination of the twin laws for all the specimens investigated. The structure has been refined using the approximation of the anharmonic thermal vibrations of atoms.

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Держатели документа:
ACAD SCI,INST PHYS,SIBERIAN DIV,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН

Доп.точки доступа:
Verin, I. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
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Makarova, I. P.
X-ray diffraction study of RbLiCrO4 / I. P. Makarova, I. A. Verin, K. S. Aleksandrov // Ferroelectrics. - 1991. - Vol. 124, Is. 1. - P. 91-96, DOI 10.1080/00150199108209420. - Cited References: 12 . - ISSN 0015-0193

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
LITHIUM POTASSIUM-SULFATE
   THERMAL VIBRATIONS
   CRYSTALS
   PROGRAM
   KLISO4
   LIKSO4
Аннотация: Crystal structure of RbLiCrO4 was determined in G3 phase (sp. gr. P31c) at 293, 428, 493, 523 K and in G2 phase (sp. gr. P63) at 553, 583 K applying X-ray diffraction data. The investigated crystals exhibit ‘twinning by merohedry’. The analysis of intensities and influence of anomalous scattering on them allowed us to choose twin elements and atomic configurations of twin domains for all the investigated specimens.

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Доп.точки доступа:
Verin, I. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; European meeting on ferroelectricity(7 ; 1991 ; Jul ; 08-12 ; Dijon, France)
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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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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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    Layered hydroxyl sulfate: Controlled crystallization, structure analysis, and green derivation of multi-color luminescent (La,RE)2O2SO4 and (La,RE)2O2S phosphors (RE = Pr, Sm, Eu, Tb, and Dy) / X. Wang [et al.] // Chem. Eng. J. - 2016. - Vol. 302. - P. 577-586, DOI 10.1016/j.cej.2016.05.089. - Cited References: 50. - This work is supported in part by the National Natural Science Foundation of China (Grants Nos. 51172038, 51302032, and U1302272), the Fundamental Research Fund for the Central Universities (Grant No. N140204002), Grants-in-Aid for Scientific Research (KAKENHI No. 26420686), and the Russian Foundation for Basic Research (15-52-53080). X.J. Wang acknowledges financial support from the China Scholarship Council for her overseas Ph.D. study (Contract No. 201406080035) and the assistance of Q. Q. Zhu (University of Science and Technology of China) for his help with calcination. . - ISSN 1385-8947
   Перевод заглавия: Слоистые гидроксил сульфаты: контролируемая кристаллизация, структурный анализ, и зеленый синтез мультицветных люминофоров (La,RE)2O2SO4 и (La,RE)2O2S (RE=Pr, Sm, Eu, Tb, and Dy)

РУБ Engineering, Environmental + Engineering, Chemical
Рубрики:
PHOTOLUMINESCENCE PROPERTIES
   OXYSULFATE/OXYSULFIDE SYSTEMS
   CRYSTAL-STRUCTURE
   OXYGEN-STORAGE
   Ln
   NANOCOMPOSITES
   EMISSION
   CAPACITY
   FAMILY
   FABRICATION
Кл.слова (ненормированные):
Sulfate type layered rare earth hydroxide -- Luminescence -- Oxysulfate -- Oxysulfide
Аннотация: The two important groups of Ln2O2SO4 and Ln2O2S compounds are traditionally synthesized with the involvements of environmentally harmful sulfur-containing reagents. We developed in this work a unique green approach for their synthesis, using Ln2(OH)4SO4·2H2O layered hydroxyl sulfate as the precursor (Ln-241 phase). Phase selective crystallization of La-241 under both atmospheric pressure and hydrothermal conditions was firstly optimized, followed by transformation into La2O2S and La2O2SO4 by controlled calcination. Rietveld structure refinement was performed for La-241, La(OH)SO4, La2O2SO4, and La2O2S, and the crystal structure and cell parameters of La-241 were originally reported. The photoluminescence performances of several important activators (Pr3+, Sm3+, Eu3+, Tb3+, and Dy3+) in the two hosts, in terms of excitation, emission, quantum yield, and color coordinates of emission, were thoroughly investigated, and multi-color luminescence including bright red, green, orange red, and yellow was obtained under ultraviolet excitation. Detailed investigations of Tb3+ photoluminescence revealed that the lack of 5D3 emission in La2O2S and the gradual quenching of 5D3 blue emission at a higher Tb3+ content (hence decreasing I488/I545 ratio and changing color coordinates) in La2O2SO4 were suggested to be due to thermal activation of the 5D3 electrons into the conduction band and cross relaxation between adjacent Tb3+, respectively. The synthesis approach developed in this work for La2O2SO4 and La2O2S, with water vapor as the only exhaust gas, is environmentally benign and holds great potential in the facile synthesis of analogous compounds of other lanthanides. © 2016 Elsevier B.V.

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Держатели документа:
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, China
Advanced Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation

Доп.точки доступа:
Wang, X.; Li, J. -G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhu, Q.; Li, X.; Sun, X.
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State of iron in nanoparticles prepared by impregnation of silica gel and aluminum oxide with FeSO4 solutions / G. A. Bukhtiyarova [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 4. - P. 826-837, DOI 10.1134/S1063783410040268. - Cited References: 27. - This study was supported by the Presidium of the Russian Academy of Sciences within the framework of the Program no. 27 "Principles of Basic Research of Nanotechnologies and Nanomaterials," Project no. 46 "Magnetically Ordered Nanoparticles in Catalytic Systems: Synthesis, Evolution, and Physicochemical Properties." . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
THERMAL-DECOMPOSITION
   BETA-FEOOH
   MOSSBAUER
   FERRIHYDRITE
   EPSILON-FE2O3
   FE-2(SO4)(3)
   SULFATE
   FE-57
Аннотация: The state of iron in nanoparticles prepared by impregnating silica gel and aluminum oxide with iron(II) sulfate solutions has been investigated using Mossbauer spectroscopy. It has been revealed that the state of iron depends on the nature of the support. Iron(III) hydroxysulfate and iron(III) oxysulfate nanoparticles are formed on the surface of silica gel, and iron oxide nanoparticles are formed on the surface of aluminum oxide. An increase in the concentration of iron ions or in the size of iron-containing particles leads to hydration of the nanoparticle surface. The calcination of the samples results in the formation of E -Fe2O3 oxide in a strongly disordered or amorphous state in iron-containing particles on the surface of silica gel.

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Держатели документа:
[Bukhtiyarova, G. A.
Mart'yanov, O. N.
Yakushkin, S. S.
Shuvaeva, M. A.] Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[Bayukov, O. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent'eva 5, Novosibirsk 630090, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Bukhtiyarova, G. A.; Mart'yanov, O. N.; Yakushkin, S. S.; Shuvaeva, M. A.; Bayukov, O. A.; Баюков, Олег Артемьевич
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Flerov, I. N.
Heat capacity and phase transitions in NH4LiSO4, Cs-x(NH4)(1-x) LiSO4, and RbLiSO4 / I. N. Flerov, A. V. Kartashev, V. A. Grankina // Phys. Solid State. - 2005. - Vol. 47, Is. 4. - P. 720-728, DOI 10.1134/1.1913987. - Cited References: 29 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ROOM-TEMPERATURE
   MONTE-CARLO
   LINH4SO4
   SUBSTITUTION
   CRYSTALS
   SULFATE
   CSLISO4
Аннотация: The heat capacity of NH4LiSO4, RbLiSO4, and Cs-x(NH4)(1 - x) LiSO4 crystals and its behavior over a broad temperature range including the phase transition regions were studied. The entropy changes corresponding to structural transformations in these crystals were found not to be characteristic of straightforward ordering of structural blocks. The results obtained are discussed in terms of phenomenological theory and model concepts. (C) 2005 Pleiades Publishing, Inc.

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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:
Kartashev, A. V.; Карташев, Андрей Васильевич; Grankina, V. A.; Флёров, Игорь Николаевич
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Mel'nikova, S. V.
Optical investigations of the effect of gradual substitution NH4 - Cs on the ferroelastic phase transition in a CsLiSO4 crystal / S. V. Mel'nikova, V. A. Grankina // Phys. Solid State. - 2004. - Vol. 46, Is. 3. - P. 515-520, DOI 10.1134/1.1687871. - Cited References: 14 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
AMMONIUM LITHIUM-SULFATE
TEMPERATURE PHASE
NH4LISO4
Аннотация: Crystals of Cs-x(NH4)(1 - x)LiSO4 (0.39 less than or equal to x less than or equal to 1.0) solid solutions are grown and investigated using polarized light microscopy and measurements of the birefringence in the temperature range 100-530 K. The (x-T) phase diagram of the Cs-x(NH4)(1 - x)LiSO4 solid solutions is constructed. It is demonstrated that, upon substitution of ammonium for cesium in the CsLiSO4 crystal, the phase transition temperature gradually increases to such a degree that the ferroelastic phase can exist at room temperature. The triple point of intersection of the Pmcn, P2(1)cn, and P112(1)/n phase boundaries is determined. It is established that the introduction of ammonium in small amounts has an unusually strong effect on the refractive properties and character of the ferroelastic phase transition in the CsLiSO4 crystal. (C) 2004 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.; Мельникова, Светлана Владимировна
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Nuclear spin resonance study of the ion mobility in a KHSeO4 crystal / Y. N. Ivanov [et al.] // Phys. Solid State. - 2004. - Vol. 46, Is. 10. - P. 1845-1850, DOI 10.1134/1.1809417. - Cited References: 15 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
POTASSIUM HYDROGEN SULFATE
EXCHANGE NMR
SOLIDS
Аннотация: The ion mobility in a crystal of partially deuterated potassium hydroselenate (KHSe) was studied using nuclear spin resonance (NSR) of H-1, H-2, Se-77, and K-39 in a wide temperature range. The temperature dependences of the deuterium NSR spectra above 360 K exhibit changes in the line shape characteristic of chemical exchange processes. These exchange processes were studied in detail using two-dimensional H-2 NSR spectroscopy. It was ascertained that the exchange between deuterons of hydrogen bonds take place in the entire temperature range under study. However, the measured conductivity was approximately one-hundredfold lower than that estimated from the exchange frequencies. It was assumed that the low conductivity in the temperature range under study is caused by closed dimers of SeO4 groups in the KHSe structure. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Leipzig, D-04103 Leipzig, Germany
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Leipzig University, Leipzig, D-04103, Germany

Доп.точки доступа:
Ivanov, Y. N.; Иванов, Юрий Николаевич; Sukhovskii, A. A.; Суховский, Андрей Андреевич; Aleksandrova, I. P.; Александрова, Инга Петровна; Totz, J.; Michel, D.
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10.

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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