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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Likhacheva A. Y., Borodina U. O., Vtyurin A. N.
Заглавие : Raman study of hydro-cancrinite compressed in an aqueous medium at high pressures and temperatures
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2021. - Vol. 85, Is. 9. - P.962-964. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873821090112
Примечания : Cited References: 13. - This work was performed as part of a State Task for the Sobolev Institute of Geology and Mineralogy and the Kirensky Institute of Physics. It was supported by the Russian Foundation for Basic Research, project no. 21-55-14001
Аннотация: In situ Raman spectroscopy is used to study the behavior of synthetic carbonate–aluminosilicate hydro-cancrinite Na6Ca2[(OH,CO3)2 Al6Si6O24]·2H2O compressed in an aqueous medium up to 1.6 GPa at 500°C. It is found that hydro-cancrinite retains its crystal structure up to 1.5 GPa and 300°C. It then amorphizes as the temperature rises, partially dissolves, and decomposes into two main products: nepheline and a scheelite-like compound.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Atuchin V. V., Chimitova O.D., Molokeev M. S., Bazarov B.G., Adichtchev S.V., Surovtsev N.V., Bazarova Zh.G.
Заглавие : Synthesis, structural and vibrational properties of microcrystalline RbSm(Mo04)2
Коллективы : International Conference on Minerals and Materials
Место публикации : International conference on minerals and materials . - 2011. - С. 90-92
https://www.sites.google.com/site/mmcem2011/abstracts
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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) : Goryainov, Sergey, V, Tse, John S., Desgreniers, Serge, Kawaguchi, Saori, I, Pan, Yuanming, Likhacheva, Anna Yu, Molokeev M. S.
Заглавие : In situ X-ray diffraction study of chrysotile at high P–T conditions: transformation to the 3.65 Å phase
Коллективы : Ministry of Science and Higher Education of the Russian Federation; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [21-55-14001]; Natural Science and Engineering Council CanadaNatural Sciences and Engineering Research Council of Canada (NSERC)
Место публикации : Phys. Chem. Miner. - 2021. - Vol. 48, Is. 10. - Ст.36. - ISSN 0342-1791, DOI 10.1007/s00269-021-01160-8. - ISSN 1432-2021(eISSN)
Примечания : Cited References: 68. - This work was performed under the auspicious of the state assignment of IGM SB RAS supported by Ministry of Science and Higher Education of the Russian Federation. The Russian Foundation for Basic Research (project no.21-55-14001) is gratefully acknowledged. Authors thank S.V. Rashchenko for fruitful discussion on XRD diffraction patterns of the talc-water system. We thank SPring-8 Synchrotron Radiation Facilities and BLXU-10 beamline for providing the synchrotron beam-time. JST, SD and YP would like to thank Natural Science and Engineering Council Canada for the award of individual Discovery Grants
Предметные рубрики: HIGH-PRESSURE STABILITY
HYDROUS MAGNESIUM SILICATES
SYSTEM MGO-SIO2-H2O MSH
Аннотация: The behavior of chrysotile Mg3(Si2O5)(OH)4 in water medium at simultaneously high pressure and high temperature was studied by in situ synchrotron X-ray diffraction using a diamond anvil cell. In contrast to previous ‘dry’ experiments, chrysotile in water-saturated conditions undergoes two-phase transitions and exhibits higher thermal stability. At 260 °C / 3.7 GPa the initial chrysotile (phase I) transforms to the ‘chrysotile-like’ phase II, followed by the appearance of the ‘chrysotile-like’ phase III at 405 °C / 5.25 GPa. Phase III is characterized by enlarged interlayer distances, presumably resulting from the H2O intercalation into the interlayer space. During further compression, the ‘chrysotile-like’ phase III is decomposed to the 10 Å phase Mg3(Si4O10)(OH)2·xH2O, the 3.65 Å phase MgSi(OH)6, phase D, forsterite, enstatite and coesite or stishovite. The 3.65 Å phase appears at 8.8 GPa / 500 °C. The series of transformations leads to a water deficiency in the system, restricting the complete transformation from the 10 Å phase to the 3.65 Å phase. These data emphasize the crucial role of excess water in the stabilization of the high-pressure hydrous phases. The present study is the first in situ observation of sequential transformations of hydrous phases: serpentine → 10 Å phase → 3.65 Å phase, important as a potential water transport mechanism to the deep mantle.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Ovchinnikov S. G., Balaev A. D., Ivanova N.B., Pashkevich, Yu. G., Michel C.R., Bondarenko G. V.
Заглавие : Magnetic and transport properties of Gd(0.9)A(0.1)CoO(3-delta) (A = Ba, Sr)
Место публикации : J. Magn. Magn. Mater. - 2009. - Vol. 321, Is. 9. - P.1266-1271. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2008.11.087
Примечания : Cited Reference Count: 31. - Гранты: This study was supported by the Rosnauka (Project no. MK-4278.2008.2), Russian Foundation for Basic Research (Project no. 08-02-90708 mob_st) and "Strongly correlated electrons'' program of the Department of Physical Sciences of RAS.Финансирующая организация: Rosnauka [MK-4278.2008.2]; Russian Foundation for Basic Research [08-02-90708 mob_st]; "Strongly correlated electrons'' program of the Department of Physical Sciences of RAS
Предметные рубрики: PEROVSKITE
PR
LA
EU
ND
LN
TRANSITION
SPIN
GD
SM
Ключевые слова (''Своб.индексиров.''): perovskite structure--doped cobaltite--magnetic susceptibility--metal-insulator transition--doped cobaltite--magnetic susceptibility--metal-insulator transition--perovskite structure--antiferromagnetism--barium--cobalt compounds--electric conductivity--ferromagnetic materials--ferromagnetism--gadolinium--magnetic susceptibility--metal insulator boundaries--oxide minerals--paramagnetic materials--perovskite--phase separation--semiconductor insulator boundaries--transport properties--antiferromagnetic--doped cobaltite--doped samples--electrical conductivity measurements--ferromagnetic transitions--insulator-metal transitions--magnetic and transport properties--magnetic behaviors--perovskite structure--temperature ranges--transport datum--x- ray diffractions--metal insulator transition
Аннотация: The X-ray diffraction, magnetization and electrical conductivity measurements for Gd(0.9)A(0.1)CoO(3-delta) (A = Ba, Sr) have been made. The complicated magnetic behavior, including the paramagnetic-ferromagnetic-antiferromagnetic and paramagnetic-ferromagnetic transitions, was found for Ba- and Sr-doped samples. The gradual insulator-metal transitions were observed in a wide temperature range T = 600-800 K. The complex magnetic and transport data could be explained on the basis of the structural phase separation. (C) 2009 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fokina V. D., Gorev M. V., Kocharova A. G., Flerov I. N., Pogoreltsev E.I.
Заглавие : Phase transitions and thermodynamic properties of (NH4)(3)VO2F4 cryolite
Место публикации : Solid State Sci. - 2009. - Vol. 11, Is. 4. - P.836-840. - ISSN 1293-2558, DOI 10.1016/j.solidstatesciences.2008.11.004
Примечания : Cited Reference Count: 17. - Гранты: The authors are grateful to Dr. SM. Mel'nikova for the permission to use the unpublished results.; This work was supported by the Russian Foundation for Basic Research (project 06-02-16102).Финансирующая организация: Russian Foundation for Basic Research [06-02-16102]
Предметные рубрики: PEROVSKITE-LIKE OXYFLUORIDES
(NH4)(3)TIOF5
CS
(NH4)(3)WO3F3
DIFFRACTION
(NH4)3VO2F4
ELPASOLITE
METALS
RB
Ключевые слова (''Своб.индексиров.''): oxyfluorides--phase transition--calorimetry--phase diagram--ferroelectricity--calorimetry--ferroelectricity--oxyfluorides--phase diagram--phase transition--calorimetry--ferroelectricity--halide minerals--phase diagrams--sugar (sucrose)--thermodynamic properties--calorimetric measurements--cubic phase--first-order phase transitions--heat capacities--oxyfluorides--phase transition temperatures--pressure dependences--structural transformations--temperature ranges--phase transitions
Аннотация: Calorimetric measurements performed in a wide temperature range on (NH4)(3)VO2F4 have shown the presence of four heat capacity anomalies at T-1 = 438 K, T-2 = 244 K, T-3 = 210.2 K, T-4 = 205.1 K associated with the first order phase transitions. In accordance with the permittivity behavior, the structural transformations are of nonferroelectric nature. Pressure dependence of the phase transition temperatures has been studied by DTA under pressure. The entropy of phase transitions is analyzed mainly in the framework of the orientational disordering of NH4+ and VO2F43- ions in a cubic phase. (C) 2008 Elsevier Masson SAS. All rights reserved.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Grossman V.G., Bazarov B.G., Atuchin V.V., Molokeev M.S., Bazarova J.G., Gavrilova T.A.
Заглавие : K2(l-x)Rb2xA12B207, 0x0.75: nonlinear optical borates
Коллективы : International Conference on Minerals and Materials
Место публикации : International Conference on Minerals and Materials / International Conference on Minerals and Materials (2011 ; Sep. ; 29-30, ; Ulaanbaatar, Mongolia). - 2011. - С. 90-92
https://www.sites.google.com/site/mmcem2011/abstracts
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kartashev A. V., Flerov I. N., Volkov N. V., Sablina K. A.
Заглавие : Heat capacity and magnetocaloric effect in manganites (La1-yEuy)(0.7)Pb0.3MnO3 (y:0.2; 0.6)
Место публикации : J. Magn. Magn. Mater. - 2010. - Vol. 322, Is. 6. - P.622-627. - MAR. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2009.10.026
Примечания : Cited Reference Count: 17. - Гранты: This work was supported by the Krasnoyarsk's regional sciences foundation and RFBR in the framework of project "Siberia''(Grant no. 09-02-98001), by Integrational project of Siberian and Far Eastern Departments of RAS(no. 101) and by Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools(Projectno. NSh-1011.2008.2). Dr Maxim S. Molokeev is acknowledged for the X-raycharacterization of the samples.Финансирующая организация: Krasnoyarsk's regional sciences foundation [09-02-98001]; Siberian and Far Eastern Departments [101]; Russian Federation [NSh-1011.2008.2]
Предметные рубрики:
Ключевые слова (''Своб.индексиров.''): manganites--magnetic phase transition--heat capacity--magnetocaloric effect--heat capacity--magnetic phase transition--magnetocaloric effect--manganites--adiabatic calorimeters--heat capacities--magnetic phase transitions--magneto-caloric effects--magnetocaloric effect--multi-element--nonmagnetics--relative cooling power--temperature range--europium--lead--manganese compounds--oxide minerals--specific heat--phase transitions
Аннотация: Heat capacity and intensive magnetocaloric effect (MCE) in manganites (La1-yEuy)(0.7)Pb0.3MnO3[y=0.2; 0.6] (LEPM) were investigated by means of adiabatic calorimeter. The heat capacity anomaly as well as the values of both the intensive (Delta T-AD) and the extensive (Delta S-MCE) MCE were found to decrease upon increased replacement of La with nonmagnetic Eu. However, because of widening of the MCE peaks, the LEPM compounds show the relative cooling power, RCP/Delta H, comparable to other solid solutions of manganites. Owing to strong effect of Eu - La substitution on the Curie temperature, LEPM might have potential as the solid state refrigerants in multi-element cooling apparatus operating in a wide temperature range. (C) 2009 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronin A. S., Masiygin A. N., Molokeev M. S., Khartov S. V.
Заглавие : Atomic layer deposition ZnO on porous Al2O3 nanofibers film
Коллективы : International Scientific Conference on Applied Physics, Information Technologies and Engineering
Место публикации : J. Phys. Conf. Ser. - 2020. - Vol. 1679, Is. 2. - Ст.022072. - DOI 10.1088/1742-6596/1679/2/022072
Примечания : Cited References: 10. - Studies by scanning electron microscopy and X-ray powder diffraction were performed on the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS». The transmission electron microscopy investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation
Аннотация: The paper presents the results of the formation and study of the morphological and structural characteristics of the mesoporous ZnO / Al2O3 nanofibers film (ZANF). The deposition of a ZnO layer on Al2O3 nanofibers film (ANF) ~ 1 µm thick was carried out by the method of atomic layer deposition. The morphology of the mesoporous composite layer ZnO / Al2O3 (ZANF) has been studied by scanning and transmission electron microscopy. It is shown that in the process of atomic layer deposition, the ZnO layer grows according to the Stranski-Krastanov mechanism. A ZnO layer less than 5 nm thick gives an island structure in which Al2O3 nanofibers are uniformly coated with ZnO particles, an increase in the ZnO layer thickness to 15 nm demonstrates a continuous coating of Al2O3 nanofibers. The system has a core-shell structure. The resulting composite structures are promising for applications in photocatalysis and gas sensing.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorobyev S., Likhatski M., Romanchenko A., Maksimov N., Zharkov S. M., Krylov A. S., Mikhlin Y.
Заглавие : Colloidal and deposited products of the interaction of tetrachloroauric acid with hydrogen selenide and hydrogen sulfide in aqueous solutions
Место публикации : Minerals. - 2018. - Vol. 8, Is. 11. - Ст.492. - ISSN 2075163X (ISSN), DOI 10.3390/min8110492
Примечания : Cited References: 63. - This research was funded by the Siberian Branch of the Russian Academy of sciences, Program of Interdisciplinary Studies, grant number 64 (project 303).
Ключевые слова (''Своб.индексиров.''): gold selenide--gold sulfoselenide--colloids--nanoparticles--nucleation--liquid intermediates--deposition
Аннотация: The reactions of aqueous gold complexes with H2Se and H2S are important for transportation and deposition of gold in nature and for synthesis of AuSe-based nanomaterials but are scantily understood. Here, we explored species formed at different proportions of HAuCl4, H2Se and H2S at room temperature using in situ UV-vis spectroscopy, dynamic light scattering (DLS), zeta-potential measurement and ex situ Transmission electron microscopy (TEM), electron diffraction, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Metal gold colloids arose at the molar ratios H2Se(H2S)/HAuCl4 less than 2. At higher ratios, pre-nucleation “dense liquid” species having the hydrodynamic diameter of 20–40 nm, zeta potential −40 mV to −50 mV, and the indirect band gap less than 1 eV derived from the UV-vis spectra grow into submicrometer droplets over several hours, followed by fractional nucleation in the interior and coagulation of disordered gold chalcogenide. XPS found only one Au+ site (Au 4f7/2 at 85.4 eV) in deposited AuSe, surface layers of which partially decomposed yielding Au0 nanoparticles capped with elemental selenium. The liquid species became less dense, the gap approached 2 eV, and gold chalcogenide destabilized towards the decomposition with increasing H2S content. Therefore, the reactions proceed via the non-classical mechanism involving “dense droplets” of supersaturated solution and produce AuSe1−xSx/Au nanocomposites.
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