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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Romanova O. B., Ryabinkina L. I.
Заглавие : Peculiarities of the transport and magnetic properties of the cation substituted manganese sulphides
Место публикации : Ninth International workshop on Non–Crystalline solids, Porto 2008, p. 60
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kumar N., Kesari S., Krylova S. N., Rao R., Surovtsev N. V., Ishchenko D. V., Pryanichnikov S. V., Govorkova T. E., Bobin S. B., Lonchakov A. T., Golyashov V. A., Tereshchenko O. E.
Заглавие : Structural phase transition in crystalline HgSe: Low-temperature and high-pressure Raman spectroscopic investigation
Колич.характеристики :11 с
Место публикации : J. Phys. Chem. Solids. - 2025. - Vol. 207. - Ст.112977. - ISSN 00223697 (ISSN), DOI 10.1016/j.jpcs.2025.112977. - ISSN 18792553 (eISSN)
Примечания : Cited References: 50. - The authors acknowledge support by the Saint–Petersburg State University (Grant No. 125022702939-2), SRF SKIF Boreskov Institute of Catalysis (FWUR-2024-0040) and the Russian Science Foundation (Grant No. 23-12-00016). The research was carried out within the framework of the state assignment of the Ministry of Science and Higher Education of the Russian Federation for the IMP UB RAS
Аннотация: At ambient pressure and temperature, Raman spectroscopy showed A1, E and T2 modes in HgSe which suggested coexistence of zinc blende (zb) and cinnabar (cin) phase. A blue shift of A1 and E Raman modes was observed with increasing temperature, which was explained by the reduction of lattice constant. Experimental results of Raman spectroscopy were consistent with the DFT calculation, both predicted transition to cin phase at moderate pressure of 1.5–1.8 GPa, and a complete absence of the Raman modes was observed above pressure of 16 GPa, confirming the transformation to the NaCl structure. The pressure-dependent frequency shift, linewidth and Raman intensity was explained by eigenvectors of vibrational symmetry of the modes, anharmonic effect and changes in polarizability.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Lundin A. A.
Заглавие : On the statistical theory of the shape of multiple quantum NMR spectra in solids
Колич.характеристики :14 с
Место публикации : Russ. J. Phys. Chem. B. - 2024. - Vol. 18, Is. 5. - P.1249-1262. - ISSN 19907931 (ISSN), DOI 10.1134/S1990793124701070. - ISSN 19907923 (eISSN)
Примечания : Cited References: 18. - This work was carried out as part of a state assignment of the Russian Ministry of Science and Higher Education (topic no. 122040500060-4) and the scientific topics of Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences and Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Аннотация: The statistical model developed in this study allows us to calculate the shape of multiple quantum (MQ) NMR spectra (the dependence of the amplitudes of the corresponding MQ coherences on their orders) by decomposing the desired time-correlation functions (TCFs) over an infinite set of orthogonal operators and by using some well-known facts from the physics of traditional model systems. The resulting expression contains series of gradually increasing numbers of spins in clusters of correlated spins depending on time. The influence of the possible degradation of these clusters on the shape of the spectra is taken into account. Analytical and numerical calculations are performed for various parameter values included in the final expressions. The developed theory adequately describes the results of the numerical calculations of the MQ spectra performed by us and experiments: the transformation of the Gaussian profile into an exponential one, the asymptotics (wings) of the spectrum depending on the coherence order M, and the dependence of the relaxation rate of the MQ spectrum on M, as well as the narrowing and stabilization of the MQ spectrum under the influence of a perturbation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Зобов, Владимир Евгеньевич, Лундин А. А.
Заглавие : Развитие статистической теории формы спектров многоквантового ЯМР в твердом теле
Колич.характеристики :18 с
Место публикации : Химич. физика. - 2024. - Т. 43, № 10. - С. 3-20. - ISSN 0207401X (ISSN), DOI 10.31857/S0207401X24100016
Примечания : Библиогр.: 64. - Работа выполнена в рамках госзадания Министерства науки и высшего образования Российской Федерации (тема № 122040500060-4) и в рамках научной тематики ИФ им. Л.В. Киренского СО РАН и ФИЦ ХФ им. Н.Н. Семёнова РАН
Аннотация: Развиваемая в работе статистическая модель, позволяет с помощью разложения искомых временных корреляционных функций по бесконечному набору ортогональных операторов и использования некоторых известных фактов из физики традиционных модельных систем рассчитать форму (профиль) спектров многоквантового ЯМР (зависимость амплитуд соответствующих многоквантовых когерентностей от их порядков). Полученное выражение содержит ряды по растущему числу спинов в кластерах коррелированных спинов в зависимости от времени. Учтено влияние возможной деградации указанных кластеров на форму спектров. Для различных значений параметров, входящих в окончательные выражения, выполнены аналитические и численные расчеты. Представленная теория адекватно описывает результаты численных расчетов многоквантовых спектров и экспериментов: трансформацию Гауссова профиля в экспоненциальный при увеличении порядка когерентности М, т.е. при переходе от центра спектра к крылу, зависимость скорости релаксации многоквантового спектра от М, а также его сужение и стабилизацию МК спектра под действием возмущения.The statistical model developed in this work allows us to calculate the shape of the multiple quantum (MQ) NMR spectra (the dependence of the amplitudes of the corresponding multiple quantum coherences on their orders) by decomposing the desired time-correlation functions (TCF) over the infinite set of orthogonal operators and by using some well-known facts from the physics of traditional model systems. The resulting expression contains series with terms depending on the gradually growing up with the time number of spins in clusters of correlated spins. The influence of the possible degradation of these clusters on the shape of the spectra is taken into account. Analytical and numerical calculations were performed for various parameter values included in the final expressions. The developed theory adequately describes the results of numerical calculations of the MQ spectra performed by us and experiments: the transformation of the Gaussian profile into an exponential one, the asymptotics (wings) of the spectrum depending on the coherence order M, the dependence of the relaxation rate of the MQ spectrum on M, as well as the narrowing and stabilization of the MQ spectrum under the influence of perturbation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Muftakhudinov A. R., Popov D. V., Fazlizhanov I. I., Likerov R. F., Makarchenko A. S., Ganeeva Yu. M., Moshkina E. M., Eremina R. M.
Заглавие : High-temperature properties of Mn0.75Co2.25BO5 compound
Колич.характеристики :7 с
Место публикации : Magn. Reson. Solids. - 2024. - Vol. 26, Is. 3. - Ст.24301. - ISSN 20725981 (eISSN), DOI 10.26907/mrsej-24301
Примечания : Cited References: 11. - This research was supported by the Russian Science Foundation (project no. 23-72-00047)
Аннотация: Temperature-dependence measurements specific heat, thermoelectric power, conductivity, and electron paramagnetic resonance measurements were performed on Mn0.75Co2.25BO5 powder at temperatures above 290 K. Single crystals of Mn0.75Co2.25BO5 were grown by the flux method using Bi2Mo3O12-based solvent diluted with Na2CO3. To investigate EPR and specific heat capacity, the single crystals were ground to powder. The temperature dependencies of the resistance, specific heat, Seebeck constant, and EPR spectra in the range from 290 K to 700 K were obtained. The transition from the dielectric state to the semiconductor state was detected at 348 K, consistent with the change in the fine structure of the EPR spectrum associated with S = 5/2 for the manganese ion Mn2+.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Maksimov D. N., Ershov A. E.
Заглавие : Optical coupled-mode theory for dielectric solids of revolution
Место публикации : Phys. Rev. A. - 2023. - Vol. 107, Is. 4. - Ст.043506. - ISSN 24699926 (ISSN), DOI 10.1103/PhysRevA.107.043506. - ISSN 24699934 (eISSN)
Примечания : Cited References: 33. - This work received financial support through Russian Science Foundation Grant No. 22-72-00102
Аннотация: We propose a single resonance coupled-mode approach to light scattering by dielectric solids of revolution. By using a biorthogonal decomposition of the S matrix found with the extended boundary condition method we derived all parameters required for application of the temporal coupled-mode theory in a closed form. The proposed approach allows for constructing a frequency-dependent Fano response due to a single resonance after the full-wave solution has been found at a single incident frequency.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ronzhin N. O., Posokhina E. D., Mikhlina E. V., Shestakov N. P., Nemtsev I. V., Bondar V. S., Ryzhkov I. I.
Заглавие : The effect of copper and iron adsorption on the catalytic performance of alumina nanofiber / nanodiamond composite in sensing applications
Место публикации : J. Phys. Chem. Solids. - 2022. - Vol. 167. - Ст.110785. - ISSN 00223697 (ISSN), DOI 10.1016/j.jpcs.2022.110785
Примечания : Cited References: 68. - This work is supported by the Russian Foundation for Basic Research, Project 18–29–19078. The authors would like to express their special thanks to Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS» for providing the equipment to ensure the accomplishment of this project
Аннотация: Phenolic compounds are common environmental pollutants, which are used in many industries and contaminate water environment due to industrial wastewater discharge. Presently, there is an increasing demand for the development and improvement of inexpensive, easy-to-use analytical tools for in-situ detection of phenolic compounds. In this work, we investigate the effect of adsorption of Cu2+ and Fe2+ ions on the catalytic activity of a composite material based on alumina nanofibers (ANF) and detonation nanodiamonds (DND) in the co-oxidation of phenols with 4-aminoantipyrine in the presence of hydrogen peroxide. We have found more than two-fold increase of the catalytic activity for ANF + DND + Cu composite, while the activity of ANF + DND + Fe composite is found to decrease by several times in comparison with the original ANF + DND material. The results of FTIR analysis indicate that the adsorption of iron ions occurs with the formation of hydroxide surface groups and hydrogen bonds, which apparently block their catalytic activity in the Fenton redox cycle. The higher catalytic performance of AND + DND composite functionalized with copper ions makes it possible to detect two times lower concentrations of analytes (phenol and 4-chlorophenol) in comparison with the original composite. It is shown that the AND + DND + Cu composite provides a linear yield of the co-oxidation reaction product in a wide range of analyte concentrations (0.25–100 μM for phenol and 0.5–25 μM for 4-chlorophenol). Model experiments demonstrate the applicability of copper-functionalized composite as a reusable sensor for the determination of phenol in aqueous samples.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Vazhenina I. G., Yaroslavtsev R. N., Chekanova L. A., Cheremiskina E., Mikhlin Y.
Заглавие : Magnetic composite coatings FeC and NiC synthesized with arabinogalactan
Место публикации : IEEE Magn. Lett. - 2022. - Vol. 13. - Ст.2503505. - ISSN 1949307X (ISSN), DOI 10.1109/LMAG.2022.3164631
Примечания : Cited References: 23. - This work was supported by Russian Foundation for Basic Research, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science under Project 20-42-240010. The authors thank the Center of Collective Use of the Federal Research Center, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences for the provided equipment
Аннотация: In this work, we investigated the ferromagnetic resonance spectra of metal/carbon composite coatings. FeC and NiC coatings were synthesized by electroless deposition using polysaccharide arabinogalactan. An analysis of the angular dependences of the resonance field showed that the coatings consist of three magnetic phases separated by a nonmagnetic phase of carbon.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S.
Заглавие : SI: Advances in density functional theory (DFT) studies of solids
Место публикации : Mater. - 2022. - Vol. 15, Is. 6. - Ст.2099. - ISSN 19961944 (ISSN), DOI 10.3390/ma15062099
Примечания : Cited References: 10
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Lundin A. A.
Заглавие : Multiple-quantum NMR spectroscopy and quantum information spreading control in the spin systems of solids
Место публикации : J. Exp. Theor. Phys. - 2022. - Vol. 135, Is. 5. - P.752-761. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776122110139. - ISSN 10906509 (eISSN)
Примечания : Cited References: 49. - This work was supported within the State assignment of the Ministry of Science and Higher Education of the Russian Federation (registration number 1021051201992-1)
Аннотация: Multiple-quantum (MQ) solid-state NMR spectroscopy allows the growth of multiple-spin correlations and, thus, the spreading of quantum information in the object under study to be observed. Recently, in [11] it was proposed to control this process through a controlled perturbation added to the effective Hamiltonian that causes degradation of correlated spin clusters with a rate determined by the number of spins K in a cluster. However, this perturbation can also lead to degradation whose rate is determined by the coherence order M. In this paper, to investigate the influence of a small added perturbation, we used an expansion into orthogonal operators that allowed the cluster size distribution to be taken into account. In our calculations we realized a simple model with known amplitudes of the expansion into a complete set of orthogonal operators in the absence of a perturbation. We performed numerical calculations of the “preparation time” dependences of the MQ spectra, their second moments, and the coherence orders at which the MQ spectra decrease by a factor of e as well as the average correlated spin cluster sizes K¯. The coherence-order-dependent contribution to the degradation is shown to change the shape of the MQ spectrum. In particular, as the preparation time increases, the MQ spectrum can be stabilized, while the growth of K¯ is retained. Due to the change in the shape of the MQ spectrum, the relations of its characteristics to the number K¯ change compared to those for the Gaussian function (traditionally used to process the experiments). These changes should be taken into account when studying the spreading of quantum information through MQ spectroscopy.
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