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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Sedykh A. E., Molokeev M. S., Oreshonkov A. S., Aleksandrovsky A. S., Krylov A. S., Khritokhin N. A., Sal'nikova E. I., Andreev O. V., Muller-Buschbaum K.
Заглавие : Crystal and electronic structure, thermochemical and photophysical properties of europium-silver sulfate monohydrate AgEu(SO4)2·H2O
Место публикации : J. Solid State Chem. - 2021. - Vol. 294. - Ст.121898. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2020.121898
Примечания : Cited References: 54. - This work was partially supported by the Russian Foundation for Basic Research (Grant 19-33-90258∖19 ). Use of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center « Krasnoyarsk Science Center SB RAS» is acknowledged
Аннотация: In order to synthesize single crystals of europium-silver double sulfate monohydrate, a hydrothermal reaction route was used. It was found that the crystallization cannot be performed under standard conditions. The compound AgEu(SO4)2·H2O crystallizes in the trigonal crystal system, space group P3221 (a = 6.917(1), c = 12.996(2) Å, V = 538.53(17) Å3). The structure consists of triple-capped trigonal prisms [EuO9], in which one oxygen atom belongs to crystalline water, silver octahedra [AgO6], and sulfate tetrahedra [SO4]. The hydrogen bonds in the system additionally stabilize the structure. The electronic band structure wasstudied by density functional theory calculations which show that AgEu(SO4)2·H2O is an indirect band gap dielectric. Temperature dependent photoluminescence spectroscopy shows emission bands of transitions from the 5D0 state to the spin-orbit components of the 7FJmultiplet (J = 0–6).The ultranarrow transition 5D0 - 7F0 shows a red shift with respect to other europium-containing water-free sulfates that is ascribed to the presence of OH group in the crystal structure in the close vicinity of the Eu3+ ion. An effect of abnormal sensitivity of the Ω4 intensity factor to minor distortions of the local environment is detected for the observed low local symmetry of C2.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grishina, Svetlana, Goryainov, Sergey, Oreshonkov A. S., Karmanov, Nikolay
Заглавие : Micro-Raman study of cesanite (Ca2Na3(OH)(SO4)3) in chloride segregations from Udachnaya-East kimberlites
Коллективы : International GeoRaman Conference
Место публикации : J. Raman Spectrosc. - 2022. - Vol. 53, Is. 3: Special Issue: GEORAMAN 2020. - P.497-507. - ISSN 0377-0486, DOI 10.1002/jrs.6168. - ISSN 1097-4555(eISSN)
Примечания : Cited References: 33
Предметные рубрики: CARBONATE
IDENTIFICATION
INSIGHTS
APATITE
Аннотация: Cesanite (Ca2Na3(OH)(SO4)3), a rare mineral, has been found in a few places restricted to a geothermal field and caves. We report the new occurrence of cesanite in quite different geological site—within sulfate-rich melt inclusions in chloride segregations from kimberlites of Udachnaya-East pipe (Siberia). Two halite generations: сesanite free and сesanite-bearing, were distinguished in concentrically zonal segregations according to the results of the mineral and sulfate melt inclusion study by micro-Raman spectroscopy and SEM-EDS. We have applied the Raman spectroscopy and first principles calculations to understand structural and vibrational properties of cesanite daughter mineral in polyphase sulfate inclusions. Polarized spectra provided additional information on the overlapped components of the spectral profile. The Raman spectra of cesanite in the range of OH stretching vibrations are reported for the first time. The study aims to clarify the source of the NaSCl-enrichment in the Udachnaya-East pipe, which is highly discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Molokeev M. S., Oreshonkov A. S., Krylov A. S., Aleksandrovsky A. S., Azarapin N. O., Andreev O. V., Razumkova I. A., Atuchin V. V.
Заглавие : Crystal structure, vibrational, spectroscopic and thermochemical properties of double sulfate crystalline hydrate [CsEu(H2O)3(SO4)2]·H2O and its thermal dehydration product CsEu(SO4)2
Место публикации : Crystals. - 2021. - Vol. 11, Is. 9. - Ст.1027. - ISSN 20734352 (ISSN), DOI 10.3390/cryst11091027
Примечания : Cited References: 103. - This work was partially supported by the Russian Foundation for Basic Research (grant 19-33-90258\19)
Аннотация: Crystalline hydrate of double cesium europium sulfate [CsEu(H2O)3(SO4)2]·H2O was synthesized by the crystallization from an aqueous solution containing equimolar amounts of 1Cs+:1Eu3+:2SO42− ions. Anhydrous salt CsEu(SO4)2 was formed as a result of the thermal dehydration of the crystallohydrate. The unusual effects observed during the thermal dehydration were attributed to the specific coordination of water molecules in the [CsEu(H2O)3(SO4)2]·H2O structure. The crystal structure of [CsEu(H2O)3(SO4)2]·H2O was determined by a single crystal X-ray diffraction analysis, and the crystal structure of CsEu(SO4)2 was obtained by the Rietveld method. [CsEu(H2O)3(SO4)2]·H2O crystallizes in the monoclinic system, space group P21/c (a = 6.5574(1) Å, b = 19.0733(3) Å, c = 8.8364(2) Å, β = 93.931(1)°, V = 1102.58(3) Å3). The anhydrous sulfate CsEu(SO4)2 formed as a result of the thermal destruction crystallizes in the monoclinic system, space group C2/c (a = 14.327(1) Å, b = 5.3838(4) Å, c = 9.5104(6) Å, β = 101.979(3) °, V = 717.58(9) Å3). The vibration properties of the compounds are fully consistent with the structural models and are mainly determined by the deformation of non-rigid structural elements, such as H2O and SO42−. As shown by the diffused reflection spectra measurements and DFT calculations, the structural transformation from [CsEu(H2O)3(SO4)2]·H2O to CsEu(SO4)2 induced a significant band gap reduction. A noticeable difference of the luminescence spectra between cesium europium sulfate and cesium europium sulfate hydrate is detected and explained by the variation of the extent of local symmetry violation at the crystallographic sites occupied by Eu3+ ions, namely, by the increase in inversion asymmetry in [CsEu(H2O)3(SO4)2]·H2O and the increase in mirror asymmetry in CsEu(SO4)2. The chemical shift of the 5D0 energy level in cesium europium sulfate hydrate, with respect to cesium europium sulfate, is associated with the presence of H2O molecules in the vicinity of Eu3+ ion.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Atuchin V. V., Molokeev M. S., Wang N., Jiang X., Aleksandrovsky A. S., Krylov A. S., Oreshonkov A. S., Sedykh A. E., Volkova S. S., Lin Z., Andreev O. V., Muller-Buschbaum K.
Заглавие : Negative thermal expansion in one-dimension of a new double sulfate AgHo(SO4)2 with isolated SO4 tetrahedra
Место публикации : J. Mater. Sci. Technol. - 2021. - Vol. 76. - P.111-121. - ISSN 10050302 (ISSN), DOI 10.1016/j.jmst.2020.10.026
Примечания : Cited References: 55. - This work was financially supported by the Russian Foundation for Basic Research (Nos. 18-02-00754 and 18-32-20011 ), the National Scientific Foundations of China (No. 11974360 ) and the Russian Science Foundation (No. 19-42-02003 , in the part of conceptualization). M.S. Molokeev, A.S. Aleksandrovsky, A.S. Krylov, and A.S. Oreshonkov are grateful to Basic Project of the Ministry of Science of the Russian Federation in part of XRD, luminescent and Raman studies. IR-spectrometry was performed using resources of the Research Resource Center "Natural Resource Management and Physico-Chemical Research". Use of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS» is acknowledged
Аннотация: A double holmium-silver sulfate was obtained for the first time. The temperature intervals for the formation and stability of the compound were determined by differential scanning calorimetry. The crystal structure of AgHo(SO4)2 was determined by Rietveld method. The X-ray diffraction (XRD) analysis showed that the compound crystallizes in the monoclinic syngony, space group P21/m, with the unit cell parameters a = 4.71751 (4) Å, b = 6.84940 (6) Å and c = 9.89528 (9) Å, β = 95.1466 (4)°, V = 318.448 (5) Å3, Z = 2, RB = 1.55 %, T = 303 K. Two types of sulfate tetrahedra were found in the structure, which significantly affected the spectral properties in the infrared range. In the temperature range of 143−703 K, a negative thermal expansion along the b direction accompanied by a positive thermal expansion along the a and c directions was observed. It was established that negative thermal expansion is the result of the deformation of sulfate tetrahedra, which is affected by the movement of holmium and silver atoms. The excitation in the blue spectral range (457.9 nm) produces a luminescence in light blue (489 nm), green (545 nm) and red (654 nm) spectral ranges, and the latter two were of comparable intensity that is favorable for WLED sources. The observed luminescent band distribution is ascribed to the specific crystal field at Ho3+ ion sites rather than a variation of radiationless probability.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Molokeev M. S., Korotkov L. N., Rysiakiewicz-Pasek E.
Заглавие : Specific heat and thermal expansion of triglycine sulfate-porous glass nanocomposites
Коллективы : Russian Foundation for Basic Research [16-32-00092 mol-a]
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 7. - P.1338-1343. - ISSN 1063-7834, DOI 10.1134/S1063783418070181. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 27. - This study was supported by the Russian Foundation for Basic Research, project no. 16-32-00092 mol-a.
Предметные рубрики: PHASE-TRANSITIONS
DIELECTRIC-PROPERTIES
FERROELECTRIC COMPOSITES
Аннотация: The effect of restricted geometry on specific heat capacity and thermal expansion of the triglycine sulfate (TGS)–borosilicate glass composites have been studied first. A decrease in the entropy and temperature of the P21 ↔ P21/m phase transition in the TGS component with decreasing the glass matrix pore diameter at the invariable specific heat and thermal expansion coefficient has been observed. The estimates are indicative of the minor effect of internal pressure on the TGS pressure coefficient dTC/dp in the composites.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Aleksandrovsky A. S., Atuchin V. V., Krylov A. S., Molokeev M. S., Oreshonkov A. S., Shestakov N. P., Andreev O. V.
Заглавие : Exploration of structural, thermal and spectroscopic properties of self-activated sulfate Eu2(SO4)3 with isolated SO4 groups
Место публикации : J. Ind. Eng. Chem. - 2018. - Vol. 68. - P.109-116. - ISSN 1226086X (ISSN), DOI 10.1016/j.jiec.2018.07.034
Примечания : Cited References: 83. - This work was supported by the Russian Foundation for Basic Research ( 16-52-48010 , 17-52-53031 ). The equipments of the Collective Use Center — Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch Russian Academy of Sciences [ http://ccu.kirensky.ru/ ] was used.
Ключевые слова (''Своб.индексиров.''): europium sulfate--synthesis--structure--thermal analysis--photoluminescence
Аннотация: Eu2(SO4)3 was synthesized by chemical precipitation method and the crystal structure was determined by Rietveld analysis. The compound crystallizes in monoclinic space group С2/с. In the air environment, Eu2(SO4)3 is stable up to 670 °C. The sample of Eu2(SO4)3 was examined by Raman, Fourier-transform infrared absorption and luminescence spectroscopy methods. The low site symmetry of SO4 tetrahedra results in the appearance of the IR inactive ν1 mode around 1000 cm−1 and ν2 modes below 500 cm−1. The band intensities redistribution in the luminescent spectra of Eu3+ ions is analyzed in terms of the peculiarities of its local environment.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Atuchin V. V., Molokeev M. S., Aleksandrovsky A. S., Krylov A. S., Oreshonkov A. S., Volkova S. S., Andreev O. V.
Заглавие : Structure, thermal stability, and spectroscopic properties of triclinic Double sulfate AgEu(SO4)2 with isolated SO4 groups
Место публикации : Inorg. Chem. - 2018. - Vol. 57, Is. 21. - P.13279-13288. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.8b01837
Примечания : Cited References: 81. - This work was supported by the Russian Foundation for Basic Research (Grants 16-52-48010 and 17-52-53031). The equipment of the Collective Use Center, Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch Russian Academy of Sciences (http://ccu.kirensky.ru/) were used.
Аннотация: Silver–europium double sulfate AgEu(SO4)2 was obtained by solid-phase reaction between Ag2SO4 and Eu2(SO4)3. The crystal structure of AgEu(SO4)2 was determined by Monte Carlo method with simulated annealing, and after that, it was refined by the Rietveld method from X-ray powder diffraction data. The compound crystallizes in the triclinic symmetry, space group P1̅ (a = 0.632929(4), b = 0.690705(4), c = 0.705467(4) nm, α = 98.9614(4), β = 84.5501(4), γ = 88.8201(4)°, V = 0.303069(3) nm3). Two types of sulfate tetrahedra were found in the structure, which significantly affects the spectroscopic properties in the IR-range. In the temperature range of 143–703 K, the average linear thermal expansion coefficients of cell parameters a, b, and c are very similar, (1.11–1.67) × 10–5 K–1 in magnitude, and therefore, AgEu(SO4)2 expands almost isotropically. Upon heating in argon flow, AgEu(SO4)2 is stable up to 1053 K. The luminescence spectra in the region of ultranarrow 5D0–7F0 transition contain a single narrow and symmetric line at 579.5 nm that is evidence of good crystalline quality of AgEu(SO4)2 and uniform local environment of Eu3+ ions in the structure. Distribution of luminescence bands is determined by the environment of Eu3+ ions in the structure. Influence of Ag+ ions on the electron density distribution at Eu sites is detected.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karnachuk O. V., Rusanov I. I., Panova I. A., Kadnikov V. V., Avakyan M. R., Ikkert O. P., Lukina A. P., Beletsky A. V., Mardanov A. V., Knyazev Yu. V., Volochaev M. N., Pimenov N. V., Ravin N. V.
Заглавие : The low-temperature germinating spores of the thermophilic Desulfofundulus contribute to an extremely high sulfate reduction in burning coal seams
Колич.характеристики :13 с
Место публикации : Front. Microbiol. - 2023. - Vol. 14. - Ст.1204102. - ISSN 1664302X (eISSN), DOI 10.3389/fmicb.2023.1204102
Примечания : Cited References: 80. - This study was supported by the Russian Science Foundation Projects 21-14-00114 (to OK, sampling, sulfate reduction rate measurements, pure culture isolation and physiological experiments with pure culture and spores) and 22-14-00178 (to NR, metagenome and genome sequencing and analysis) and the Ministry of Science and Higher Education of the Russian Federation
Аннотация: Burning coal seams, characterized by massive carbon monoxide (CO) emissions, the presence of secondary sulfates, and high temperatures, represent suitable environments for thermophilic sulfate reduction. The diversity and activity of dissimilatory sulfate reducers in these environments remain unexplored. In this study, using metagenomic approaches, in situ activity measurements with a radioactive tracer, and cultivation we have shown that members of the genus Desulfofundulus are responsible for the extremely high sulfate reduction rate (SRR) in burning lignite seams in the Altai Mountains. The maximum SRR reached 564 ± 21.9 nmol S cm−3 day−1 at 60°C and was of the same order of magnitude for both thermophilic (60°C) and mesophilic (23°C) incubations. The 16S rRNA profiles and the search for dsr gene sequences in the metagenome revealed members of the genus Desulfofundulus as the main sulfate reducers. The thermophilic Desulfofundulus sp. strain Al36 isolated in pure culture, did not grow at temperatures below 50°C, but produced spores that germinated into metabolically active cells at 20 and 15°C. Vegetative cells germinating from spores produced up to 0.738 ± 0.026 mM H2S at 20°C and up to 0.629 ± 0.007 mM H2S at 15°C when CO was used as the sole electron donor. The Al36 strain maintains significant production of H2S from sulfate over a wide temperature range from 15°C to 65°C, which is important in variable temperature biotopes such as lignite burning seams. Burning coal seams producing CO are ubiquitous throughout the world, and biogenic H2S may represent an overlooked significant flux to the atmosphere. The thermophilic spore outgrowth and their metabolic activity at temperatures below the growth minimum may be important for other spore-forming bacteria of environmental, industrial and clinical importance.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Semenov S. V., Knyazev Yu. V., Balaev D. A., Karnachuk O. V., Ikkert O. P.
Заглавие : Biosyntesis of magnetic nanocomposites using sulfate-reducing bacteria
Коллективы : Байкальская международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Иркутский государственный университет
Место публикации : Магнитные материалы. Новые технологии: тез. докл. IX Байкал. междунар. конф. BICMM-2023/ чл. прогр. ком.: S. S. Aplesnin [et al.] ; чл. орг. ком. R. S. Iskhakov [et al.]. - Иркутск, 2023. - P.170. - ISBN 978-5-00133-051-6, DOI 10.26516/978-5-9624-2178-0.2023.1-207
Примечания : Библиогр.: 2
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Basova S. A., Molokeev M. S., Oreshonkov A. S., Zhernakov M. A., Khritokhin N. A., Aleksandrovsky A. S., Krylov A. S., Sal’nikova E. I., Azarapin N. O., Shelpakova N. A., Muller-Buschbaum K., Denisenko Yu. G.
Заглавие : Thermochemistry, structure, and optical properties of a new β-La2(SO4)3 polymorphic modification
Колич.характеристики :14 с
Место публикации : Inorganics. - 2023. - Vol. 11, Is. 11. - Ст.434. - ISSN 23046740 (eISSN), DOI 10.3390/inorganics11110434
Примечания : Cited References: 58. - The work was partly carried out within the framework of the Strategic Academic Leadership Program “Priority-2030” for the Kazan Federal University and the state assignment of the Kirensky Institute of PhysicsWe acknowledge Lisa-Marie Wagner (JLU Giessen) for help with X-ray powder diffractometry, and Svetlana Volkova and Irina Palamarchuk (UTMN) for help with IR- and UV-spectrometry. The use of equipment provided by the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” is acknowledged
Аннотация: A new polymorphic modification of lanthanum sulfate was obtained by thermal dehydration of the respective nonahydrate. According to powder X-ray diffraction, it was established that β-La2(SO4)3 crystallized in the C2/c space group of the monoclinic system with the KTh2(PO4)3 structure type (a = 17.6923(9), b = 6.9102(4), c = 8.3990(5) Å, β = 100.321(3)°, and V = 1010.22(9) Å3). Temperature dependency studies of the unit cell parameters indicated almost zero expansion along the a direction in the temperature range of 300–450 K. Presumably, this occurred due to stretching of the [LaO9]n chains along the c direction, which occurred without a significant alteration in the layer thickness over the a direction. A systematic study of the formation and destruction processes of the lanthanum sulfates under heating was carried out. In particular, the decisive impact of the chemical composition and formation energy of compounds on the thermodynamic and kinetic parameters of the processes was established. DFT calculations showed β-La2(SO4)3 to be a dielectric material with a bandgap of more than 6.4 eV. The processing of β-La2(SO4)3 with the Kubelka–Munk function exhibited low values below 6.4 eV, which indicated a fundamental absorption edge above this energy that was consistent with LDA calculations. The Raman and infrared measurements of β-La2(SO4)3 were in accordance with the calculated spectra, indicating that the obtained crystal parameters represented a reliable structure.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Yu. G., Molokeev M. S., Jiang X., Sedykh A. E., Aleksandrovsky A. S., Oreshonkov A. S., Roginskii E. M., Zhernakov M. A., Heuler D., Seuffert M., Lin Zh., Andreev O. V., Muller-Buschbaum K.
Заглавие : Negative thermal expansion in the polymorphic modification of double sulfate β-AEu(SO4)2 (A–Rb+, Cs+)
Колич.характеристики :11 с
Место публикации : Inorg. Chem. - 2023. - Vol. 62, Is. 31. - P.12423-12433. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.3c01624. - ISSN 1520510X (eISSN)
Примечания : Cited References: 71. - The work was partly carried out within the framework of the Strategic Academic Leadership Program ″Priority-2030″ for the Siberian Federal University, Tyumen State University, Kazan Federal University and the state assignment of Kirensky Institute of Physics. The calculations were performed in part using facilities of JSCC supercomputer center of RAS
Аннотация: New polymorphic modifications of double sulfates β-AEu(SO4)2 (A–Rb+, Cs+) were obtained by the hydrothermal method, the structure of which differs significantly from the monoclinic modifications obtained earlier by solid-state methods. According to single-crystal diffraction data, it was found that the compounds crystallize in the orthorhombic system, space group Pnna, with parameters β-RbEu(SO4)2: a = 9.4667(4) Å, b = 13.0786(5) Å, c = 5.3760(2) Å, V = 665.61(5) Å3; β-CsEu(SO4)2: a = 9.5278(5) Å, b = 13.8385(7) Å, c = 5.3783(3) Å, V = 709.13(7) Å3. The asymmetric part of the unit cell contains one-half Rb+/Cs+ ion, one-half Eu3+ ion, both in special sites, and one SO42– ion. Both compounds exhibit nonlinear negative thermal expansion. According to the X-ray structural analysis and theoretical calculations, the polarizing effect of the alkali metal ion has a decisive influence on the demonstration of this phenomenon. Experimental indirect band gaps of β-Rb and β-Cs are 4.05 and 4.11 eV, respectively, while the direct band gaps are 4.48 and 4.54 eV, respectively. The best agreement with theoretical calculations is obtained using the ABINIT package employing PAW pseudopotentials with hybrid PBE0 functional, while norm-conserving pseudopotentials used in the frame of CASTEP code and LCAO approach in the Crystal package gave worse agreement. The properties of alkali ions also significantly affect the luminescent properties of the compounds, which leads to a strong temperature dependence of the intensity of the 5D0 → 7F4 transition in β-CsEu(SO4)2 in contrast to much weaker dependence of this kind in β-RbEu(SO4)2.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Sedykh A. E., Basova S. A., Atuchin V. V., Molokeev M. S., Aleksandrovsky A. S., Krylov A. S., Oreshonkov A. S., Khritokhin N. A., Sal'nikova E. I., Andreev O. V., Muller-Buschbaum K.
Заглавие : Exploration of the structural, spectroscopic and thermal properties of double sulfate monohydrate NaSm(SO4)2·H2O and its thermal decomposition product NaSm(SO4)2
Место публикации : Adv. Powder Technol. - 2021. - Vol. 32, Is. 11. - P.3943-3953. - ISSN 09218831 (ISSN), DOI 10.1016/j.apt.2021.08.009
Примечания : Cited References: 81. - This work was partly supported by the Russian Science Foundation (21-19-00046) and Russian Foundation for Basic Research (Grant 19-33-90258\19). The use of the equipment of Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” is acknowledged
Аннотация: Samarium-sodium double sulfate crystalline hydrate NaSm(SO4)2·H2O was obtained by the crystallization from an aqueous solution containing equimolar amounts of ions. The anhydrous salt of NaSm(SO4)2 was formed by a thermally induced release of the equivalent of water from NaSm(SO4)2·H2O. The kinetic parameters of thermal decomposition were determined (Ea = 102 kJ/mol, A = 9·106). The crystal structures of both compounds were refined from the X-ray powder diffraction data. Sulfate hydrate NaSm(SO4)2·H2O crystallizes in the trigonal symmetry, space group P3121 (a = 6.91820(3) and c = 12.8100(1) Å, V = 530.963(7) Å3). The anhydrous salt crystallizes in the triclinic symmetry, space group P-1 (a = 6.8816(2), b = 6.2968(2) and c = 7.0607(2) Å, α = 96.035(1), β = 99.191(1) and γ = 90.986(1)°, V = 300.17(1) Å3). The vibrational properties of compounds are mainly determined by the sulfate group deformations. The luminescence spectra of both sulfates are similar and are governed by the transitions of samarium ions 4G5/2 → 6HJ (J = 5/2, 7/2, 9/2 and 11/2). The anhydrous sulfate is stable up to 1100 K and undergoes an almost isotropic expansion when heated. After 1100 K, the compound decomposes into Sm2(SO4)3 and Na2SO4.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Sedykh A. E., Oreshonkov A. S., Molokeev M. S., Azarapin N. O., Sal'nikova E. I., Chimitova O. D., Andreev O. V., Razumkova I. A., Muller-Buschbaum K.
Заглавие : Europium (II) sulfate EuSO4: Synthesis methods, crystal and electronic structure, luminescence properties
Коллективы : [0273-2021-0008]
Место публикации : Eur. J. Inorg. Chem. - 2022. - Vol. 2022, Is. 12. - Ст.e202200043. - ISSN 1434-1948, DOI 10.1002/ejic.202200043. - ISSN 1099-0682(eISSN)
Примечания : Cited References: 69. - This research is partially supported by the state order of BINM SB RAS (project no. 0273-2021-0008)
Предметные рубрики: DEPENDENT DECAY BEHAVIOR
ELECTROCHEMICAL REDUCTION
OPTICAL-PROPERTIES
Аннотация: In the present work, we report on the synthesis of EuSO4 powders by two different methods using EuS as starting material. The compound EuSO4 contains divalent europium and crystallizes in the orthorhombic crystal system, space group Pnma with parameters close to SrSO4. The compound exhibits near isotropic thermal expansion over the temperature range 300–700 K. EuSO4 was examined by Raman, Fourier-transform infrared absorption and luminescence spectroscopy methods. EuSO4 is found to be an indirect bandgap material with a bandgap close to direct electronic transition. The emission lifetime of divalent europium d-f emission in EuSO4 shows an unusual behavior for stoichiometric compounds, as it shortens upon cooling from 1.11(1) μs at room temperature to 0.44(1) μs at 77 K.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Atuchin V. V., Molokeev M. S., Sedykh A. E., Khritokhin N. A., Aleksandrovsky A. S., Oreshonkov A. S., Shestakov N. P., Adichtchev S. V., Pugachev A. M., Sal’nikova E. I., Andreev O. V., Razumkova I. A., Muller-Buschbaum K.
Заглавие : Exploration of the crystal structure and thermal and spectroscopic properties of monoclinic praseodymium sulfate Pr2(SO4)3
Место публикации : Molecules. - 2022. - Vol. 27, Is. 13. - Ст.3966. - ISSN 14203049 (ISSN), DOI 10.3390/molecules27133966
Примечания : Cited References: 95. - This research was funded by the Russian Science Foundation (project 21-19-00046, in part of conceptualization). Some parts of the experiments were performed in the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: Praseodymium sulfate was obtained by the precipitation method and the crystal structure was determined by Rietveld analysis. Pr2(SO4)3 is crystallized in the monoclinic structure, space group C2/c, with cell parameters a = 21.6052 (4), b = 6.7237 (1) and c = 6.9777 (1) Å, β = 107.9148 (7)°, Z = 4, V = 964.48 (3) Å3 (T = 150 °C). The thermal expansion of Pr2(SO4)3 is strongly anisotropic. As was obtained by XRD measurements, all cell parameters are increased on heating. However, due to a strong increase of the monoclinic angle β, there is a direction of negative thermal expansion. In the argon atmosphere, Pr2(SO4)3 is stable in the temperature range of T = 30–870 °C. The kinetics of the thermal decomposition process of praseodymium sulfate octahydrate Pr2(SO4)3·8H2O was studied as well. The vibrational properties of Pr2(SO4)3 were examined by Raman and Fourier-transform infrared absorption spectroscopy methods. The band gap structure of Pr2(SO4)3 was evaluated by ab initio calculations, and it was found that the valence band top is dominated by the p electrons of oxygen ions, while the conduction band bottom is formed by the d electrons of Pr3+ ions. The exact position of ZPL is determined via PL and PLE spectra at 77 K to be at 481 nm, and that enabled a correct assignment of luminescent bands. The maximum luminescent band in Pr2(SO4)3 belongs to the 3P0 → 3F2 transition at 640 nm.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Molokeev M. S., Bogdanov E. V., Bondarev V. S., Korotkov L. N., Rysiakiewicz-Pasek E.
Заглавие : Effect of restricted geometry and external pressure on the phase transitions in ammonium hydrogen sulfate confined in a nanoporous glass matrix
Место публикации : J. Mater. Sci. - 2018. - Vol. 53, Is. 15. - P.12132–12144. - ISSN 00222461 (ISSN), DOI 10.1007/s10853-018-2467-1
Примечания : Cited References: 44. - The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the Research Project No. 16-32-00092 mol_a.
Ключевые слова (''Своб.индексиров.''): hydraulics--hydrostatic pressure--permittivity--pore size--specific heat--sulfur compounds--thermal expansion
Аннотация: A study of heat capacity, thermal dilatation, susceptibility to hydrostatic pressure, permittivity and polarization loops was carried out on NH4HSO4–porous glass nanocomposites (AHS + PG) as well as empty glass matrices. The formation of dendrite clusters of AHS with a size, dcryst, exceeding the pore size was found. An insignificant anisotropy of thermal expansion of AHS + PG showing statistically uniform distribution of AHS with random orientations of nanocrystallites over the matrix was observed. The effect of internal and external pressures on thermal properties and permittivity was studied. At the phase transition P-1 ↔ Pc, a strongly nonlinear decrease in the entropy ΔS2 and volume strain (ΔV/V)T2 was observed with decreasing dcryst. The linear change in temperatures of both phase transitions P-1 ↔ Pc ↔ P21/c under hydrostatic pressure is accompanied by the expansion of the temperature range of existence of the ferroelectric phase Pc, while this interval narrows as dcryst decreases.
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16.

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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17.

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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18.

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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19.

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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20.

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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