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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarova I. P., Verin I. A., Aleksandrov K. S.
Заглавие : Structure and twinning of RbLiCrO4 crystals
Место публикации : Acta Crystallogr. B. - 1993. - Vol. 49. - P.19-28. - ISSN 0108-7681, DOI 10.1107/S0108768192006141
Примечания : Cited References: 14
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarova I. P., Verin I. A., Aleksandrov K. S.
Заглавие : X-ray diffraction study of RbLiCrO4
Коллективы : European meeting on ferroelectricity
Место публикации : Ferroelectrics. - 1991. - Vol. 124, Is. 1. - P.91-96. - ISSN 0015-0193, DOI 10.1080/00150199108209420
Примечания : Cited References: 12
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Zherebtsova L. I., Iskornev I. M., Kruglik A. I., Rozanov O. V., Flerov I. N.
Заглавие : Investigation of structural and physical properties of cesium-lithium double sulfate
Место публикации : Sov. Phys. Solid State. - 1980. - Vol. 22, Is. 12. - P.2150-2152. - ISSN 0584-5807; Phys. Solid State
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wang X., Li J. -G., Molokeev M. S., Zhu Q., Li X., Sun X.
Заглавие : 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)
Место публикации : Chem. Eng. J.: Elsevier, 2016. - Vol. 302. - P.577-586. - ISSN 13858947 (ISSN), DOI 10.1016/j.cej.2016.05.089
Примечания : 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.
Предметные рубрики: PHOTOLUMINESCENCE PROPERTIES
OXYSULFATE/OXYSULFIDE SYSTEMS
CRYSTAL-STRUCTURE
OXYGEN-STORAGE
Ln
NANOCOMPOSITES
EMISSION
CAPACITY
FAMILY
FABRICATION
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bukhtiyarova G. A., Mart'yanov O. N., Yakushkin S. S., Shuvaeva M. A., Bayukov O. A.
Заглавие : State of iron in nanoparticles prepared by impregnation of silica gel and aluminum oxide with FeSO4 solutions
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 4. - P826-837. - ISSN 1063-7834, DOI 10.1134/S1063783410040268
Примечания : 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."
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Kartashev A. V., Grankina V. A.
Заглавие : Heat capacity and phase transitions in NH4LiSO4, Cs-x(NH4)(1-x) LiSO4, and RbLiSO4
Разночтения заглавия :авие SCOPUS: Heat capacity and phase transitions in NH4LiSO4, Csx(NH4)1-xLiSO4, and RbLiSO 4
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 4. - P720-728. - ISSN 1063-7834, DOI 10.1134/1.1913987
Примечания : Cited References: 29
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Grankina V. A.
Заглавие : Optical investigations of the effect of gradual substitution NH4 - Cs on the ferroelastic phase transition in a CsLiSO4 crystal
Разночтения заглавия :авие SCOPUS: Optical Investigations of the Effect of Gradual Substitution NH4 Cs on the Ferroelastic Phase Transition in a CsLiSO4 Crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 3. - P515-520. - ISSN 1063-7834, DOI 10.1134/1.1687871
Примечания : Cited References: 14
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanov Y. N., Sukhovskii A. A., Aleksandrova I. P., Totz J., Michel D.
Заглавие : Nuclear spin resonance study of the ion mobility in a KHSeO4 crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 10. - P1845-1850. - ISSN 1063-7834, DOI 10.1134/1.1809417
Примечания : Cited References: 15
Предметные 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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Kartashev A. V., Grankina V. A., Flerov I. N.
Заглавие : Investigation of the reconstructive phase transition between metastable (alpha) and stable (beta) modifications of the NH4LiSO4 crystal
Разночтения заглавия :авие SCOPUS: Investigation of the Reconstructive Phase Transition between Metastable (α) and Stable (β) Modifications of the NH4LiSO 4 Crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 8. - P1572-1578. - ISSN 1063-7834, DOI 10.1134/1.1602898
Примечания : Cited References: 13
Предметные 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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