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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grishina, Svetlana, Kodera, Peter, Goryainov, Sergey, Oreshonkov A. S., Seryotkin, Yurii, Simko, Frantisek, Polozov, Alexander G.
Заглавие : Application of Raman spectroscopy for identification of rinneite (K3NaFeCl6) in inclusions in minerals
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-05-00682]; European Regional Development FundEuropean Union (EU) [ITMS 26240220086]; Vedecka Grantova Agentura MSVVaS SR a SAV [1/0313/20]
Место публикации : J. Raman Spectrosc. - 2020. - Vol. 51, Is. 12. - P.2505-2516. - ISSN 0377-0486, DOI 10.1002/jrs.6005. - ISSN 1097-4555(eISSN)
Примечания : Cited References: 55. - Russian Foundation for Basic Research, Grant/Award Numbers: 18-05-00682, 18-05-00682; European Regional Development Fund, Grant/Award Number: ITMS 26240220086; Vedecka Grantova Agentura MSVVaS SR a SAV, Grant/Award Number: 1/0313/20
Предметные рубрики: SALT MELT
IRON
DEPOSIT
FLUIDS
TRANSFORMATIONS
FERRIHYDRITE
Аннотация: Solid daughter phases in fluid and salt melt inclusions in minerals provide important clues to characterization of mineral‐forming processes. The analysis of the fluid inclusions often requires the exposure of the daughter minerals. Rinneite (K3NaFeCl6), which is a hygroscopic mineral, decomposes in air and cannot thus be identified by conventional methods. A combined approach has been applied for investigation of synthetic and natural rinneite to acquire its diagnostic Raman spectrum for a nondestructive identification. We used natural rinneite inclusions in halite, suitable for applying a complex of methods, to clear up the reference spectrum. Improved high‐resolution X‐ray diffraction (XRD) data obtained from natural rinneite inclusion are comparable with that of previously published, with similar unit cell dimensions. Polarized Raman spectra of natural inclusions were obtained using different geometries and polarization of the incident and scattered light. Interpretation of experimental Raman spectra was performed within the framework of lattice dynamics simulations and group analysis. Individual spectral bands are interpreted in terms of Raman‐active vibrational modes of K3NaFeCl6 structural units. Raman spectrum of synthetic rinneite with main peaks at 75, 91, 103, 143, 167, 171, 187, and 239 cm−1 agrees well with the spectra of rinneite inclusions in halite from the Nepa potash deposit and rinneite daughter minerals in salt melt inclusions hosted by quartz veinlets from the porphyry gold systems in the Central Slovakia Volcanic Field. This provides a firm basis for any future identification of this mineral worldwide, using nondestructive Raman spectroscopy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Onufrienok V. V., Chzhan A. V., Bondarenko G. V., Yurkin G. Yu.
Заглавие : Transition of metastable pyrrhotites to a stable phase state
Место публикации : Inorg. Mater. - 2020. - Vol. 56, Is. 9. - P.898-902. - ISSN 0020-1685, DOI 10.1134/S0020168520090137. - ISSN 1608-3172(eISSN)
Примечания : Cited References: 23
Предметные рубрики: MAGNETIC-PROPERTIES
TEMPERATURE
CHEMISTRY
Аннотация: Equilibrium phase relations of synthetic minerals prepared by annealing metastable iron sulfides, followed by prolonged isothermal storage in the Earth atmosphere, have been studied by X-ray diffraction. The results demonstrate that prolonged storage of synthetic pyrrhotites annealed at different temperatures makes it possible to identify metastable and stable phases of Fe and S compounds.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Музалевский, Константин Викторович
Заглавие : Дистанционное измерение влажности в поверхностном слое минеральной почвы на двух частотах
Место публикации : Журн. радиоэлектрон.: электронный журнал. - 2020. - № 1. - С. 3. - ISSN 1684-1719 (eISSN), DOI 10.30898/1684-1719.2020.1.7
Примечания : Библиогр.: 21. - Работа выполнена в рамках проекта РФФИ №18-05-00405, методика формирования радиоимпульсов и измерения коэффициентов отражения была развита при поддержке проекта Госзадания №0356-2019-0004
Аннотация: В данной работе экспериментально исследовалась возможность дистанционного зондирования влажности в поверхностном слое минеральной почвы на частоте 5,4ГГц (С-диапазон) и на частоте 0,63ГГц (P-диапазон). Применялась бистатическая схема измерения коэффициента отражения в свободном пространстве на фиксированном угле зондирования 35° на горизонтальной и вертикальной поляризации. Вследствие широкой диаграммы направленности используемых антенн применялся радиоимпульсный метод для разделения во временной области прямого и отраженного от почвенного покрова сигналов. В качестве приемной и передающей антенн использовалась рупорная (5,4ГГц) и логопериодическая (0,63ГГц) антенны. Радиоимпульсы формировались с использованием векторного анализатора цепей Agilent N9918A FieldFoх. Методика оценки коэффициента отражения состояла в измерении максимума огибающей радиоимпульса, отраженного от почвенного покрова относительно максимума огибающей радиоимпульса, отраженного от металлического экрана, размещенного на почвенном покрове. Экспериментально установлено, что дистанционно измеренная объемная влажность почвы на частоте 5,4ГГц, в приближении однородного диэлектрического полупространства, с квадратом коэффициента корреляции 0,780-0,897 и среднеквадратическим отклонением 1,3-2,3% (в зависимости от используемой поляризации) согласуется с влажностью поверхности почвы, измеренной контактным методом в слое 0-0,5см. Использование частоты 5,4ГГц как основной для восстановления влажности поверхности почвы нуждается в дополнительной проверке в различных условиях шероховатости поверхности почвы и растительного покрова. Предложенная модель профиля влажности почвы в виде кусочно-линейной функции позволяет дистанционно рефлектометрическим методом на двух частотах измерять объемную влажность почвы в слое 10см с квадратом коэффициента корреляции 0,758 и среднеквадратическим отклонением 2,4% относительно влажности почвы, измеренной контактным методом. Автор видит неоспоримое преимущество использования сверхширокополосных (СШП) импульсных сигналов, спектр которых сосредоточен в мегагерцовом диапазоне частот, для дальнейшего развития технологии дистанционного измерения профилей влажности в пахотном слое агропочв. Использование сверхширокополосных электромагнитных импульсов с непрерывным спектром в мегагерцовом диапазоне частот позволит решить многопараметрическую задачу по восстановлению профиля влажности в пахотном слое агропочв. В будущем технология СШП импульсного зондирования благодаря доступности миниатюрных электронных устройств может быть реализована для платформ сверхлёгкого беспилотного летательного аппарата с целью картирования влажности в пахотном слое агропочв.In this work, the possibility of remote sensing of moisture in the mineral topsoil at a frequency of 5.4 GHz (C-band) and at a frequency of 0.63 GHz (P-band) was experimentally investigated. Bistatic scheme for measuring of the reflection coefficient at a fixed angle of 25° on horizontal and vertical polarization was used. Due to the wide radiation pattern of the used antennas, the radio impulse method was used to separate in the time domain the direct and reflected signals from the soil cover. As the receiving and transmitting antennas the pair of horn (5.4 GHz) and pair log-periodic (0.63 GHz) antennas were used. Radio impulses were generated in an unreal time scale using an Agilent N9918A FieldFox vector network analyzer. The technique for measuring the reflection coefficient consisted in the measurement of the maximum of the envelope of the radio impulse, reflected from the soil cover, relative to the maximum of the envelope of the radio impulse reflected from the metal screen placed on the soil cover. It is experimentally established that the soil moisture, which was remotely measured at a frequency of 5.4 GHz, in the approximation of a homogeneous dielectric half-space, with a correlation coefficient of 0.780-0.897 and a standard deviation of 1.3-2.3% (depending on wave polarization) is consistent with the soil surface moisture measured by the contact method in a layer of 0-0.5 cm. Using the frequency of 5.4 GHz as the main one for retrieving soil surface moisture needs additional verification in various conditions of roughness of the soil surface and vegetation cover. The proposed model of the soil moisture profile in the form of a piecewise-linear function allows remotely measuring on two-frequencies soil moisture in topsoil with a correlation coefficient of 0.758 and a standard deviation of 2.4% relative to the soil moisture measured by the contact method. The author sees the indisputable advantage of using ultra-wideband (UWB) pulsed signals, the spectrum of which is concentrated in the megahertz frequency range, for the further development of technology for remote measurement of moisture profiles in the arable layer of agricultural soils. The use of ultra-wideband electromagnetic pulses with a continuous spectrum in the megahertz frequency range will allow us to solve the multi-parameter problem of restoring the moisture profile in the arable layer of agricultural soils. In the future, the UWB technology of pulsed sounding due to the availability of miniature electronic devices can be implemented for platforms of an ultra-light unmanned aerial vehicle with the aim of mapping moisture in the arable layer of agricultural soils.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuular A. A., Simunin M. M., Bermeshev T. V., Voronin A. S., Dobrosmyslov S. S., Fadeev Y. V., Molokeev M. S., Volochaev M. N., Khartov S. V.
Заглавие : The Influence of Alumina Nanofibers on the Physical and Mechanical Properties of Mineral-Filled Polyethylene: an Experimental Study
Место публикации : Tech. Phys. Lett. - 2020. - Vol. 46, Is. 12. - P.1215-1218. - ISSN 10637850 (ISSN), DOI 10.1134/S1063785020120214
Примечания : Cited References: 6. - This study was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of a state order to the Smart Materials and Structures Research Laboratory on the subject “Development of Multifunctional Smart Materials and Structures Based on Modified Polymer Composites Capable to Operate under Extreme Conditions,” subject no. FEFE-2020-0015
Аннотация: Improvement of physical and mechanical characteristics of mineral-filled polyethylene (MFPE) upon addition of alumina nanofibers with a high aspect ratio has been experimental studied. It is shown that, at the weight concentration of alumina nanofibers of 0.1 wt %, the ultimate tensile strength increases from 3.82 ± 0.04 to 6.70 ± 0.07 MPa and the Young’s modulus increases from 1.08 ± 0.01 to 1.38 ± 0.01GPa (with respect to MFPE). The MFPE/Al2O3 nanofiber composite can be described within a model of weak adhesive interaction between a filler and a matrix with high friction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fomin S. V., Muzalevskiy K. V.
Заглавие : Dielectric Model for Thawed Mineral Soils at a Frequency of 435 MHz
Место публикации : IEEE Geosci. Remote Sens. Lett. - 2021. - Vol. 18, Is. 2. - P.222-225. - ISSN 1545-598X (ISSN), DOI 10.1109/LGRS.2020.2972559. - ISSN 1558-0571 (eISSN)
Примечания : Cited References: 20. - This work was supported by the Program of SB RAS, project №0356-2019-0004
Аннотация: A single-frequency dielectric model at 435 MHz for mineral soils is proposed. The dielectric model was created on the basis of the laboratory dielectric measurements of three soil samples with clay content in the range of 9.1%-41.3%. The input parameters of the dielectric model are volumetric soil moisture and clay content. The output parameter of the dielectric model is complex permittivity (CP). The model prediction errors are comparable with the errors of instrumental measurements of the CP for refractive index and normalized attenuation 0.1-0.3 and 0.06-0.12, respectively, in terms of root-mean-square error (RMSE). The comparative analysis of dielectric predictions in the case of the developed model proved to obtain a better accuracy than the existing dielectric models. The created model may be recommended for practical use in the algorithms of soil-moisture retrieval in the P-band.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mironov V. L., Molostov I. P., Lukin Y. I., Karavaysky A. Yu., Fomin S. V.
Заглавие : Frequency-, temperature-, and texture-dependent dielectric model for frozen and thawed arctic mineral soi
Коллективы : Progress in Electromagnetics Research Symposium
Место публикации : Progr. Electromag. Res. Symp. (PIERS): Proceedings. - 2017. - P.2546-2553. - DOI 10.1109/PIERS.2017.8262181
Примечания : Cited References: 15. - Present research was supported in the frame of project No. 16-45-242162 in the corporative program of the Russian foundation for basic research and Krasnoyarsk region government foundation for science and technology. It was also supported by the RAS Presidium Program “Arctika”, 2015– 2017 and program II.12.1. of the SB RAS basic researches.
Аннотация: A simple single-frequency dielectric model for the set of frequencies which are 0.45, 1.26, 1.4, 1.6, 5.4, 6.9, 9.6, and 10.7 GHz for frozen mineral soils is developed. The model is based on the dielectric measurements of three typical soils (sandy loam, silt loam, and silty clay) at the temperature range from -1°C to -30°C. The measured data as a function of moisture were fitted with the refractive mixing dielectric model. The model parameters are maximum bound water fraction, and refractive indexes of soil solid, unfrozen bound water, and wet ice. In the result of fitting measured data, the model parameters were determined as a functions of soil type (clay content), and soil temperature. The error of the predicted values of the complex relative permittivity (CRP) of frozen soils relative to the measured ones was evaluated through determination coefficients, and root mean square error (RMSE). The values of RMSE are on the order of the dielectric measurement error itself. The proposed dielectric model can be applied in active and passive remote sensing techniques used in the cold regions.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mironov V. L., Fomin S. V., Lukin Y. I., Karavaysky A. Yu., Molostov I. P.
Заглавие : Single-frequency dielectric model of frozen mineral soils for frequencies of the basic satellites
Коллективы : Progress in Electromagnetics Research Symposium
Место публикации : Progr. Electromag. Res. Symp. (PIERS): Proceedings. - 2017. - P.2155-2161. - DOI 10.1109/PIERS.2017.8262108
Примечания : Cited References: 11. - The study was supported by a grant from the Russian Foundation for Basic Research No. 16-05-00572).
Аннотация: A simple single-frequency dielectric model for the set of frequencies which are 0.45, 1.26, 1.4, 1.6, 5.4, 6.9, 9.6, and 10.7 GHz for frozen mineral soils is developed. The model is based on the dielectric measurements of three typical soils (sandy loam, silt loam, and silty clay) at the temperature range from -1°C to -30°C. The measured data as a function of moisture were fitted with the refractive mixing dielectric model. The model parameters are maximum bound water fraction, and refractive indexes of soil solid, unfrozen bound water, and wet ice. In the result of fitting measured data, the model parameters were determined as a functions of soil type (clay content), and soil temperature. The error of the predicted values of the complex relative permittivity (CRP) of frozen soils relative to the measured ones was evaluated through determination coefficients, and root mean square error (RMSE). The values of RMSE are on the order of the dielectric measurement error itself. The proposed dielectric model can be applied in active and passive remote sensing techniques used in the cold regions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grishina S., Kodera P., Uriarte L. M., Dubessy J., Oreshonkov A. S., Goryainov S., Simko F., Yakovlev I., Roginskii E. M.
Заглавие : Identification of anhydrous CaCl2 and KCaCl3 in natural inclusions by Raman spectroscopy
Место публикации : Chem. Geol. - 2018. - Vol. 493. - P.532-543. - ISSN 00092541 (ISSN), DOI 10.1016/j.chemgeo.2018.07.017
Примечания : Cited References: 52. - The manuscript was greatly benefited from revisions of Dr. Matthew Steele-MacInnis and anonymous Reviewer. The authors are grateful to Dr. Sharigin V. for providing the sample and photograph of the chloride segregation from Udachnaya-East pipe, Dr. Mazurov M.P. for providing apatite and forsterite samples and Dr. Polozov A. for drawing the map. The computations were performed using facilities of the Computational Centre of the Research Park of St. Petersburg State University. This work is financially supported by the Russian Foundation for Basic Research (grants 15-05-09345 , 18-05-00682 ) and VEGA grant 1/0560/15.
Ключевые слова (''Своб.индексиров.''): polymorphs cacl2--raman spectra--magma-salt interaction--chlorocalcite--daughter mineral--ab initio calculations
Аннотация: Anhydrous chlorides - CaCl2, and KCaCl3 (chlorocalcite) were identified as mineral inclusions in halite from the Siberian Large Igneous Province at the contact of magmatic intrusions and evaporates. Chlorocalcite was also found as daughter mineral in polyphase hypersaline inclusions. While Raman spectra of KCaCl3 (chlorocalcite) in natural inclusions are similar to spectra of synthetic analogue, the Raman spectra of natural CaCl2 do not correspond to the published Raman spectra of synthetic CaCl2. Simulations of Raman spectra using ab initio density-functional theory (DFT) allowed us to calculate the spectra of individual polymorphs of CaCl2 and to discriminate anhydrous CaCl2 phases in natural inclusions and synthetic CaCl2. In the spectrum of the Pbcn polymorph of CaCl2 twelve different peaks could be identified at 74, 95, 99, 107, 124, 158, 164, 179, 212, 236, 244, 256 cm−1 in contrast to five peaks in the spectrum of the Pnnm polymorph of CaCl2 at 115, 157, 160, 211 and 252 cm−1. Naturally occurring CaCl2 in inclusions in halite consist of Pbcn polymorph only, which probably results from a mechanical stress on cooling from magmatic to ambient temperatures. However, the Raman spectra of the synthetic CaCl2 corresponds to the Pnnm phase with small contributions of the Pbcn phase. Raman spectra of synthetic KCaCl3 with main peaks at 58, 67, 90, 97, 133, 139, 147, 193 cm−1 agrees well with the spectra of chlorocalcite in the natural inclusions. Positions of each atom in the KCaCl3 structure were refined using the density-functional theory. There are no imaginary phonon modes for the optimized structure, indicating that the structure of KCaCl3 is stable. Calculated Raman spectrum is in a good agreement with the Raman spectrum of synthetic and natural KCaCl3 samples.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bataleva Y., Palyanov Y., Borzdov Y., Bayukov O. A.
Заглавие : Processes and conditions of the origin for Fe3+-bearing magnesiowustite under lithospheric mantle pressures and temperatures
Место публикации : Minerals. - 2019. - Vol. 9, Is. 8. - Ст.474. - ISSN 2075163X (ISSN), DOI 10.3390/min9080474
Примечания : Cited References: 82. - This research was performed by state assignment of IGM SB RAS (project No. 0330-2016-0007).
Предметные рубрики: Mineral Geochemistry and Geochronology
Аннотация: An experimental study, implicated in the revealing of the conditions for the origin for Fe3+-bearing magnesiowüstite in the lithospheric mantle, was performed using Mössbauer spectroscopy of pre-synthesized samples. Experiments were carried out using a multi-anvil high-pressure split-sphere apparatus at 6.3–7.5 GPa, in the range of 1100–1650 °C in carbonate-metal, carbonate–oxide-metal, carbonate-oxide, carbide-oxide and carbonate–metal-sulphur systems. In three experimental series, oxygen fugacity gradient in the samples was created, which enabled the study of the processes of magnesiowüstite formation under oxidizing and reducing conditions (ΔlogfO2 (FMQ) values from −1 to −5). It was established that Fe3+-bearing magnesiowüstite can form both in assemblage with oxidized phases, such as carbonate or with reduced ones—metal, carbides, sulphides, graphite and diamond. According to the Mössbauer spectroscopy, the composition of synthesized magnesiowüstite varied within a range of Fe3+/ΣFe values from 0 to 0.3, with IV and VI coordination of Fe3+ depending on P, T, fO2, x-parameters. It was established that Fe3+-bearing magnesiowüstite formation processes under upper mantle P,T-conditions include redox reactions, with magnesiowüstite being (1) reductant or (2) product of interaction, (3) crystallization processes of magnesiowüstite from an oxidized melt, where magnesiowüstite acts as a sink for ferric iron and (4) iron disproportionation.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liao, Hongxu, Zhao, Ming, Molokeev M. S., Liu, Quanlin, Xia, Zhiguo
Заглавие : Learning from a mineral structure toward an ultra-narrow-band blue-emitting silicate phosphor RbNa3(Li3SiO4)4:Eu2+
Место публикации : Angew. Chem. - Int. Edit. - 2018. - Vol. 57, Is. 36. - P.11728-11731. - ISSN 1433-7851, DOI 10.1002/anie.201807087. - ISSN 1521-3773(eISSN)
Примечания : Cited References: 22. - This work was supported by the National Natural Science Foundations of China (Grant Nos. 51722202, 91622125 and 51572023), and Natural Science Foundations of Beijing (2172036), and M.S.M. acknowledges support of the Russian Foundation for Basic Research (17-52-53031).
Предметные рубрики: RED PHOSPHORS
COLOR-GAMUT
LUMINESCENCE
Ключевые слова (''Своб.индексиров.''): luminescence--minerals--phosphors--rigid structure--silicates
Аннотация: Learning from natural mineral structures is an efficient way to develop potential host lattices for applications in phosphor converted (pc)LEDs. A narrow‐band blue‐emitting silicate phosphor, RbNa3(Li3SiO4)4:Eu2+ (RNLSO:Eu2+), was derived from the UCr4C4‐type mineral model. The broad excitation spectrum (320–440 nm) indicates this phosphor can be well matched with the near ultraviolet (n‐UV) LED chip. Owing to the UCr4C4‐type highly condensed and rigid framework, RNLSO:Eu2+ exhibits an extremely small Stokes shift and an unprecedented ultra‐narrow (full‐width at half‐maximum, FWHM=22.4 nm) blue emission band (λem=471 nm) as well as excellent thermal stability (96 %@150 °C of the initial integrated intensity at 25 °C). The color gamut of the as‐fabricated (pc)LEDs is 75 % NTSC for the application in liquid crystal displays from the prototype design of an n‐UV LED chip and the narrow‐band RNLSO:Eu2+ (blue), β‐SiAlON:Eu2+ (green), and K2SiF6:Mn4+ (red) components as RGB emitters.
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