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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Petrov M. I., Gokhfeld Yu. S., Balaev D. A., Popkov S. I., Dubrovskiy A. A., Gokhfeld D. M., Shaykhutdinov K. A.
Заглавие : Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ
Место публикации : 25th International Conference on Low Temperature Physics (LT25). – Amsterdam, Netherlands. - August 6-13. – 2008. – PB-Tu130, p.304
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Вид документа : Статья из журнала
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Автор(ы) : Aksenov S. V., Kagan M. Yu.
Заглавие : Majorana modes and Fano resonances in Aharonov–Bohm ring with topologically nontrivial superconducting bridge
Колич.характеристики :22 с
Место публикации : J. Low Temp. Phys. - 2024. - Article in press. - ISSN 00222291 (ISSN), DOI 10.1007/s10909-024-03171-5. - ISSN 15737357 (eISSN)
Примечания : Cited References: 46. - We were inspired by Andreev’s seminal contribution in the superconducting nanophysics—the field which started in fact from Josephson effect and Andreev reflection. M. Yu. Kagan thanks the Program for basic research of the National Research University Higher School of Economics for support. The work was partially carried out within the state assignment of Kirensky Institute of Physics. S.V.A. thanks the Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" for support
Аннотация: We study different resonances (first of all of the Fano type) in the interference device formed by the Aharonov–Bohm ring with superconducting (SC) wire in the topologically nontrivial state playing a role of a bridge between top and bottom arms. We analyze Majorana modes on the ends of the SC wire and show that the collapse of the additional Fano resonance, that is initially induced by transport scheme asymmetry, is connected with the increase of the length of the bridge when the binding energy of the Majorana end modes tends to zero. In local transport regime, the Fano resonances are stable against the change of the transport symmetry. The reasons of both collapse and sustainability are analyzed using a spinless toy model including the Kitaev chain.
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Вид документа : Статья из журнала
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Автор(ы) : Nikiforov A. A., Krylov A. S., Krylova S. N., Gorshkov V. S., Pelegov D. V.
Заглавие : Temperature Raman study of Li4Ti5O12 and ambiguity in the number of its bands
Колич.характеристики :10 с
Место публикации : J. Raman Spectrosc. - 2024. - Vol. 55, Is. 3. - P.406-415. - ISSN 03770486 (ISSN), DOI 10.1002/jrs.6641. - ISSN 10974555 (eISSN)
Примечания : Cited References: 51. - The research was funded by the Russian Science Foundation (project No 22-22-00350, https://rscf.ru/project/22-22-00350)
Аннотация: The two primary physical methods for identifying lithium titanate, a negative electrode material used commercially, are X-Ray diffraction and Raman spectroscopy. Although there are many publications on this topic, they are focused mainly on chemistry, so there are still some points that require clarification from a physical and methodological point of view. Difference of experimentally observed and theoretically predicted Raman spectra was explained through a combination of experiments and computations. The work comprises experiments and computations to explain why there are different numbers of predicted and observed Raman-active bands. Our low-temperature study and the analysis of thermal shifts during heating led us to conclude that the approach with surplus bands is advantageous and we recommend using major F2g band shifts to estimate the sample heating.
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Вид документа : Статья из журнала
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Автор(ы) : Nikolaev N. S., Isakova V. G., Vnukova N. G., Elesina V. I., Glushenko G. A., Tomashevich Y. V., Churilov G. N.
Заглавие : Synthesis of Ni nanoclusters supported on diamond by plasma technique and their electrochemical properties
Колич.характеристики :6 с
Место публикации : Diam. Relat. Mater. - 2024. - Vol. 142. - Ст.110844. - ISSN 09259635 (ISSN), DOI 10.1016/j.diamond.2024.110844. - ISSN 18790062 (eISSN)
Примечания : Cited References: 35
Аннотация: In this study, particles of synthetic undoped diamond (DN) obtained via the high pressure – high temperature method were coated with a nickel shell using metallic nickel plasma in a two-jet plasma generator with gas vortex and magnetic flux stabilization. Through the use of scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy, we observed the formation of a nickel diamond composite with a core-shell structure, where DN serves as the core and Ni nanoclusters form the shell (DN@Ni). The results of voltammetric analysis indicated that DN@Ni, when deposited on a graphite electrode, exhibited significant electrocatalytic activity in the oxidation of methanol and paracetamol in an alkaline electrolyte.
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Вид документа : Статья из журнала
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Автор(ы) : Zhang, Qianqian, Li, Guogang, Li, Guangzhi, Liu, Dongjie, Dang, Peipei, Qiu, Lei, Lian, Hongzhou, Molokeev M. S., Lin, Jun
Заглавие : Optical thermometer based on efficient near-infrared dual-emission of Cr3+ and Ni2+ in magnetoplumbite structure
Колич.характеристики :9 с
Место публикации : Adv. Optical Mater. - 2024. - Vol. 12, Is. 1. - Ст.2301429. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202301429
Примечания : Cited References: 22. - This work was financially supported by the National Science and Technology Major Project (2022YFB3503800), the Projects for Science and Technology Development Plan of Jilin Province (20210402046GH), the National Natural Science Foundation of China (NSFC No. 51932009, 51720105015, 51929201, 52072349, 52172166), the Natural Science Foundation of Zhejiang Province (LR22E020004), and the Project funded by China Postdoctoral Science Foundation (2022TQ0365). M.S. Molokeev acknowledges the support by the Ministry of Science and Higher Education of Russian Federation (Project No. FSRZ-2023-0006)
Аннотация: Recently, an optical thermometer based on the dual-emitting fluorescent intensity ratio (FIR) in the visible light (VIS) region has achieved great development. However, there is very little progress in thermometers from NIR light. In this work, a novel optical thermometer based on highly efficient NIR dual-emission of Cr3+ and Ni2+ in LaZnGa11O19 (LZG) with a magnetoplumbite structure is designed. Utilizing energy transfer from Cr3+ to Ni2+, the dual-emission shows a wide coverage in the 650–1600 nm region, covering the NIR I and II windows, respectively. The as-reported LZG:0.3Cr3+ and LZG:0.3Cr3+,0.01Ni2+ phosphors can reach internal/external quantum efficiency (IQE/EQE) of 94%/64% and 77%/53%, respectively. The electroluminescence property and potential applications in spectroscopic analysis, night-vision, and bioimaging of fabricated NIR-LED with LZG:0.3Cr3+,0.01Ni2+ have also been investigated. In addition, the designed ratiometric optical thermometer responds to wide temperature ranges (100-175 K, 200–475 K) and shows a maximum relative sensitivity value (Sr) of 2.4% K−1 at 475 K. The optical performance of absorption in the red region and emission in the NIR region enables the LZG:0.3Cr3+,0.01Ni2+ to become a candidate for NIR optical thermometers in biotechnological applications.
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Вид документа : Статья из журнала
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Автор(ы) : Filnov S. O., Estyunin D. A., Klimovskikh I. I., Estyunina T. P., Golyashov V. A., Tarasov A. S., Kosyrev N. N., Komarov V. A., Patrin G. S., Rybkina A. A., Vilkov O. Yu., Shikin A. M., Tereshchenko O. E., Chumakov R. G., Lebedev A. M., Rybkin A. G.
Заглавие : Room temperature ferromagnetism in graphene/SiC(0001) system intercalated by Fe and Co
Колич.характеристики :7 с
Место публикации : Phys. Status Solidi - Rapid Res. Lett. - 2024. - Vol. 18, Is. 3. - Ст.2300336. - ISSN 18626254 (ISSN), DOI 10.1002/pssr.202300336. - ISSN 18626270 (eISSN)
Примечания : Cited References: 76. - This research was funded by the Ministry of Science and Higher Education of the Russian Federation grant no. 075-15-2020-797 (13.1902.21.0024)
Аннотация: The utilization of graphene on silicon carbide (SiC) substrates holds substantial promise for advancements in spintronics and nanoelectronics. Furthermore, incorporating magnetic metals provides an optimal framework for probing fundamental physical phenomena. The approach to developing such systems is in situ intercalation of graphene with magnetic metals. Herein, the electronic structure is analyzed and the magnetic properties of the system are synthesized by the thermal decomposition of 6H-SiC(0001) surface and subsequent intercalation of graphene with cobalt (Co) and iron (Fe) atoms. X-ray photoemission spectroscopy and low-energy electron diffraction are employed to control the synthesis and metal intercalation processes. The morphological characteristics of the synthesized system are studied by means of atomic force microscopy. The findings derived from magneto-optic Kerr effect measurements reveal a homogeneous ferromagnetic ordering at room temperature. Angle-resolved photoemission spectroscopy is used to ascertain the impact of intercalation on graphene's electronic structure. The results of this study are essential for the development of graphene-based spintronics and nanoelectronic devices as well as for fundamental studies in magnetic graphene systems.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimova A.N., Gokhfeld D. M., Moroz A.N., Kashurnikov V.A.
Заглавие : Relaxation of the trapped magnetic flux in a mesoscopic HTS with artificial pinning in the form of submicron holes
Колич.характеристики :10 с
Место публикации : Chin. J. Phys. - 2024. - Vol. 88. - P.493-502. - ISSN 05779073 (ISSN), DOI 10.1016/j.cjph.2023.11.030. - ISSN 23099097 (eISSN)
Примечания : Cited References: 31. - V.A. Kashurnikov and A.N. Maksimova were supported by the Ministry of Science and Higher Education of the Russian Federation (state task project No. FSWU-2023-0031), A.N. Moroz was supported by MEPhI Program Priority 2030
Аннотация: Vortex relaxation has been studied in a microsized HTS with various distributions of artificial pinning in the form of submicro-holes. It has been shown that, in some cases, for a superconductor with dimensions up to several micrometers, the time dependences of the trapped magnetic field do not correspond with the collective creep model. The dependences of the trapped-field relaxation rate and vortex activation energy on the magnetizing field (up to 0.5 T) and temperature (up to 50 K) have been obtained. It has been shown that the presence of submicro-holes slightly increases the relaxation rate, mainly due to the decrease in the number of random nanosized pinning centers.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Muzalevskiy K. V., Walke J. P., Brakhasi F., Ye N., Wu X., Shen X.
Заглавие : On the use of dual-polarized multi-angular observations of P-band brightness temperature for soil moisture profile retrieval in thawed mineral soil
Колич.характеристики :24 с
Место публикации : Int. J. Remote Sens. - 2024. - Vol. 45, Is. 5. - P.1498-1521. - ISSN 01431161 (ISSN), DOI 10.1080/01431161.2024.2313993. - ISSN 13665901 (eISSN)
Примечания : Cited References: 37. - The work was supported by the State assignment of Kirensky Institute of Physics [FWES-2021-0034]; Australian Research Council funding [DP170102373 and LE150100047]. The work was carried out within the state assignment of Kirensky Institute of Physics and the Australian Research Council funding (DP170102373 and LE150100047) that was used to collect the P-band data
Аннотация: This article investigated the possibility of remotely sensing the soil moisture profile in thawed soil from multi-angular dual-polarized brightness temperature (TB) observations at P-band frequencies of 750 MHz and 409 MHz using a modified Burke model. Moreover, it was found that an excellent agreement (coefficient of determination R2 = 0.999 and root-mean-square error (RMSE) no more than RMSE = 0.6 K) could be achieved between the Njoku coherent brightness temperature model and the modified Burke model by introducing a reflectivity from the air-soil interface that takes into account the phases of the multiple re-reflected waves in the underlying layers. Based on the modified Burke model, the depths from which apparent moisture and temperature could be retrieved in a dielectrically-inhomogeneous, non-isothermal soil were investigated, being approximately ten times less than the depth for which apparent soil temperature could be retrieved. In general, the thickness of the emitting layer depends on the TB look angle and polarization, along with the moisture and temperature profiles of the soil. It was also shown that due to the effect of the Brewster angle, the H-polarization of TB was twice as sensitive (4 K/1%) to changes in volumetric soil moisture than V-polarization (1.9 K/1%). Based on multi-angular (10°-50°) observations of TB at H- and V-polarizations, a method of moisture profile retrieval in the top 5–15 cm soil (depending on surface moisture) was proposed using an exponential fitting function, the parameters of which are found in the course of solving the inverse problem. A decrease in the sensing frequency from 750 MHz to 409 MHz makes it possible to increase the accuracy of soil moisture profiles retrieval by a factor of two, being from RMSE = 1.6% (R2 = 0.946) to RMSE = 0.85% (R2 = 0.982) in the top 15 cm layer of soil. The conducted investigation shows the promise of using P-band observations of TB for soil moisture profile retrieval.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samoshkina Yu. E., Rautskii M. V., Neznakhin D., Stepanova E., Andreev N., Chichkov V., Zaikovskii V., Chernichenko A.
Заглавие : Strain-induced charge ordering above room temperature in rare-earth manganites
Колич.характеристики :11 с
Место публикации : Dalton Trans. - 2024. - Vol. 53, Is. 12. - P.5721-5731. - ISSN 14779226 (ISSN), DOI 10.1039/D3DT04299E. - ISSN 14779234 (eISSN)
Примечания : Cited References: 52
Аннотация: Most known mixed manganites containing rare-earth elements demonstrate a pronounced charge ordering (CO) state below room temperature. The behavior of the magnetic susceptibility and electronic magnetic resonance of polycrystalline Pr1−xSrxMnO3/YSZ (x = 0.2 and x = 0.4) films without a pronounced texture indicates the formation of the CO phase in the samples at temperatures close to and above room temperature. Moreover, this phase manifests itself with a typical sign of martensitic transformation.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou G., Wang Y., Mao Y., Guo C., Zhang J., Molokeev M. S., Xia Z., Zhang X.-M.
Заглавие : Temperature/component-dependent luminescence in lead-free hybrid metal halides for temperature sensor and anti-counterfeiting
Колич.характеристики :9 с
Место публикации : Adv. Funct. Mater. - 2024. - Ст.2401860. - Article in press. - ISSN 1616301X (ISSN), DOI 10.1002/adfm.202401860. - ISSN 16163028 (eISSN)
Примечания : Cited References: 89. - G.J.Z. and Y.T.W. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (No.52202177, 22271211), Fundamental Research Program of Shanxi Province (No.20210302124054), Science and Technology Innovation Project of Colleges and Universities in Shanxi Province (No.2021L262), 1331 Project of Shanxi Province, Postgraduate Innovation Project of Shanxi Province (No.2023KY462), and supported by the Ministry of Science and High Education of Russian Federation (No.FSRZ-2023-0006). The authors would like to thank Prof. Haijun Jiao, Leibniz-Institut für Katalyse e.V., Germany, for the theoretical support on the electron-transition mechanism
Аннотация: Hybrid metal halides (HMHs) have emerged as a promising platform for optically functional crystalline materials, but it is extremely challenging to thoroughly elucidate the electron transition coupled to additional ligand emission. Herein, to discover sequences of lead-free HMHs with distinct optically active metal cations are aimed, that is, Sb3+ (5s2) with the lone-pair electron configuration and In3+ (4d10) with the fully-filled electron configuration. (Me2NH2)4MCl6·Cl (Me = −CH3, M = Sb, In) exhibits the superior temperature/component-dependent luminescence behaviors resulting from the competition transition between triplet-states (Tn-S0) self-trapped excitons (STEs) of inorganic units and singlet-state (S1-S0) of organic cations, which is manipulated by the optical activity levels of [SbCl6]3− and [InCl6]3−. The bonding differences between Sb3+/In3+ and Cl− in terms of electronic excitation and hybridization are emphasized, and the different electron-transition mechanisms are established according to the PL spectra at the extreme temperature of 5 to 305 K and theoretical calculations. By fine-tuning the B-site Sb3+/In3+ alloying, the photoluminescence quantum yield (PLQY = 81.5%) and stability are optimized at 20% alloying of Sb3+. This research sheds light on the rules governing PL behaviors of HMHs, as well as exploring the optical-functional application of aviation temperature sensors and access-control systems.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Banerjee S., Saikia S., Molokeev M. S., Nag A.
Заглавие : Unveiling temperature-induced structural phase transition and luminescence in Mn2+-doped Cs2NaBiCl6 double perovskite
Колич.характеристики :8 с
Место публикации : Chem. Mater. - 2024. - Vol. 36, Is. 9. - P.4750-4757. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.4c00514. - ISSN 15205002 (eISSN)
Примечания : Cited References: 49. - Authors acknowledge Dr. Arup Rath’s lab NCL Pune and SAIF-IIT Bombay for diffuse reflectance spectroscopy and ICP-AES measurements, respectively. A.N. acknowledges Science & Engineering Research Board, India, for Swarnajayanti Fellowship (SB/SJF/2020-21/02), and BRICS grant (e-27558) of the Department of Science and Technology, India. Authors acknowledge the Department of Science and Technology India (FIST program, SR/FST/CS-II/2019/105) for temperature-dependent powder XRD and EPR data. S.B. is grateful to IISER Pune for a research fellowship. S.S. acknowledges Prime Minister’s Research Fellowship (PMRF), Ministry of Education, India. M.M. acknowledges the Russian Science Foundation, grant 24-43-00006
Аннотация: Halide double perovskites like Cs2NaBiCl6 are good host materials for luminescent dopants like Mn2+. The nature of photoluminescence (PL) depends on the local structure around the dopant ion, and doping may sometimes influence the global structure of the host. Here, we unveil the correlation between the temperature-induced (global) structural phase transition of Mn2+-doped Cs2NaBiCl6 with the local structure and PL of the Mn2+ dopant. X-ray diffraction analysis shows Mn2+-doped Cs2NaBiCl6 is in a cubic (Fm3m) phase between 300 and 110 K, below which the phase changes to tetragonal (I4/mmm), which persists at least until 15 K. The small (∼1%) doping amount does not alter the phase transition behavior of Cs2NaBiCl6. Importantly, the phase transition does not influence the Mn2+ d-electron PL. The PL peak energy, intensity, spectral width, and lifetime do not show any signature of the phase transition between 300–6 K. The hyperfine splitting in temperature-dependent electron paramagnetic spectra of Mn2+ ions also remain unchanged across the phase transition. These results suggest that the global structural phase transition of the host does not influence the local structure and emission property of the dopant Mn2+ ion. This structure–property insight might be explored for other transition-metal- and lanthanide-doped halide double perovskites as well. The stability of dopant emission regardless of the structural phase transition bodes well for their potential applications in phosphor-converted light emitting diodes.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Каравайский, Андрей Юрьевич, Фомин, Сергей Викторович, Лукин, Юрий Иванович
Заглавие : Модель комплексной диэлектрической проницаемости органо-минеральных почв, учитывающая минеральный состав и содержание органического вещества
Колич.характеристики :21 с
Место публикации : Журн. радиоэлектрон. - 2024. - № 1. - Ст.6. - ISSN 16841719 (eISSN), DOI 10.30898/1684-1719.2024.1.9; J. Radio Electron.
Примечания : Библиогр.: 29
Аннотация: На основе рефракционной диэлектрической модели создана одночастотная диэлектрическая модель талых и мерзлых лесных почв корневой зоны, учитывающая влияние как минеральной, так и органической компоненты почвенной смеси. Модель разработана для частоты 435 МГц на основе диэлектрических измерений пяти почв, в которых содержание органического вещества варьировалось от 11,1 до 54,4 % и глины от 21,1 до 40,9 %. Диэлектрические измерения были проведены в диапазоне массовой влажности от сухого состояния до наименьшей влагоемкости и диапазоне температур от – 30 до 25 ℃. В исследуемом диапазоне температур коэффициент детерминации между рассчитанными с использованием предложенной модели и измеренными значениями действительной (ε') и мнимой (ε") частями комплексной диэлектрической проницаемости составляет 0,988 – 0,997 для ε' и 0,957 – 0,971 для ε". Нормированное среднеквадратическое отклонение при этом составило 6 – 5,6 % для ε' и 20,2 – 21,2 % для ε". Разработанная диэлектрическая модель может быть применена в алгоритмах дистанционного зондирования при восстановлении значения влажности лесных почв корневой зоны из данных радарного и радиометрического зондирования.The single-frequency dielectric model of thawed and frozen forest soils in the root zone based on the refractive dielectric model was created, taking into account the influence of both the mineral and organic components of the soil mixture. The dielectric model was created on at 435 MHz the basis of the laboratory dielectric measurements of five soils with organic matter content in the range from 11.1 to 54.4 % and clay content from 21.1 to 40.9 %. Dielectric measurements were carried out in the range of the gravimetric moisture from the dry state to the lowest moisture capacity and in the temperature range from –30 to 25 ℃. The coefficient of determination between the predicted and measured values for real and imaginary parts of the complex permittivity are 0.988 - 0.997 and 0.957 - 0.971, respectively. The normalized standard deviations in this case are 6 - 5.6 % and 20.2 - 21.2 % for real and imaginary parts of the complex permittivity, respectively. The developed dielectric model can be used in remote sensing algorithms of soil moisture retrieval of forest soils in the root zone from the data radar and radiometric.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasikov A. A., Knyazev Yu. V., Balaev D. A., Velikanov D. A., Stolyar S. V., Mikhlin Yu. L., Yaroslavtsev R. N., Iskhakov R. S.
Заглавие : Interparticle magnetic interactions and magnetic field dependence of superparamagnetic blocking temperature in ferrihydrite nanoparticle powder systems
Место публикации : Phys. B: Condens. Matter. - 2023. - Vol. 660. - Ст.414901. - ISSN 09214526 (ISSN), DOI 10.1016/j.physb.2023.414901. - ISSN 18732135 (eISSN)
Примечания : Cited References: 66. - This study was supported by his work was supported by the Russian Science Foundation, project no. 22-72-00134
Аннотация: In this study, nanoparticles of initial synthetic ferrihydrite have been coated with arabinogalactan. The synthesized series of samples with different degrees of coverage of particles has been characterized by X-ray photoelectron spectroscopy, Mossbauer spectroscopy, transmission electron microscopy and magnetometry. The superparamagnetic blocking temperature decreases monotonically with an increase in the degree of coverage of ferrihydrite particles, which is unambiguously related to the different role of the interparticle magnetic interactions in the investigated powder systems. Analysis of the field dependence of the blocking temperature within the random anisotropy model has shown that an increase in the degree of coverage of ferrihydrite particles leads to a decrease in the size of a cluster in which the behaviors of the nanoparticle magnetic moments are correlated. The results obtained have shown the possibility of effective control of the strength of magnetic interparticle interactions in powder ferrihydrite systems by coating nanoparticles with arabinogalactan.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Visotin M. A., Sosedkin, Oleg A., Eremkin, Egor V.
Заглавие : MD investigations of of heat flow throw interfaces in 1D systems
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2023. - Vol. 16, Is. 3. - P.385-396. - ISSN 19971397 (ISSN); Журн. СФУ. Матем. и физ. - ISSN 23136022 (eISSN)
Примечания : Cited References: 26
Аннотация: Molecular dynamic calculations (MD) of heterogeneous 1D periodical systems are presented. It is proposed the new technique of direct calculations of thermal conductivity, where there is only one thermostat in one piece of unit cell as well as another piece where artificial friction forces act on atoms. With the help of this scheme, calculations of 1D heterogeneous systems having regions with atoms of different atomic masses are presented. It is shown that the difference in atomic masses in adjacent regions of the systems leads to a significant temperature jump at interfaces between these regions. This temperature jump exists independently of the mass ratio on both sides of the interface.The reasons for these jumps are discussed. It is also shown that, by changing the alternation of regions with different masses of atoms, it is possible to reduce the total thermal conductivity of the system by several times. On the base of these results, we can hope that for three-dimensional structures also, the thermal conductivity can be significantly reduced.Представлены молекулярно-динамические расчеты (МД) гетерогенных одномерных периодических систем. Предлагается новая методика прямых расчетов теплопроводности, при которой в одном элементе элементарной ячейки находится только один термостат, а в другом элементе действуют силы искусственного трения на атомы. С помощью этой схемы представлены расчеты одномерных гетерогенных систем, имеющих области с атомами разной атомной массы. Показано, что различие атомных масс в соседних областях систем приводит к значительному скачку температуры на границах раздела между этими областями. Этот скачок температуры существует независимо от отношения масс по обе стороны от границы раздела. Обсуждаются причины этих скачков. Также показано, что, изменяя чередование областей с разной массой атомов, можно в несколько раз уменьшить общую теплопроводность системы. На основании этих результатов можно надеяться, что и для трехмерных структур теплопроводность может быть значительно снижена.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Awana V. P. S., Felner, Israel, Ovchinnikov S. G., Robinson, Jason W. A.
Заглавие : Short note on the observation of ambient condition room temperature superconductivity in nitrogen-doped lutetium hydride
Место публикации : J. Supercond. Nov. Magn. - 2023. - Vol. 36, Is. 4. - P.1085-1086. - ISSN 15571939 (ISSN), DOI 10.1007/s10948-023-06563-y. - ISSN 15571947 (eISSN)
Примечания : Cited References: 21
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kirik N., Krylov A. S., Boronin A., Koshcheev S., Solovyov L., Rabchevskii E., Shishkina N., Anshits A.
Заглавие : The relationship between the structural characteristics of α-Fe2O3 catalysts and their lattice oxygen reactivity regarding hydrogen
Место публикации : Materials. - 2023. - Vol. 16, Is. 12: The 15th Anniversary of Materials — Recent Advances in Catalytic Materials. - Ст.4466. - ISSN 19961944 (eISSN), DOI 10.3390/ma16124466
Примечания : Cited References: 63. - This work was conducted within the framework of the budget project for the Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences, Federal Research Center KSC SB RAS, No. FWES–2021–0013
Аннотация: In this paper, the relationship between the structural features of hematite samples calcined in the interval of 800–1100 °C and their reactivity regarding hydrogen studied in the temperature-programmed reaction (TPR-H2) was studied. The oxygen reactivity of the samples decreases with the increasing calcination temperature. The study of calcined hematite samples used X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and Raman spectroscopy, and their textural characteristics were studied also. According to XRD results, hematite samples calcined in the temperature range under study are monophase, represented by the α-Fe2O3 phase, in which crystal density increases with increasing calcination temperature. The Raman spectroscopy results also register only the α-Fe2O3 phase; the samples consist of large, well-crystallized particles with smaller particles on their surface, having a significantly lower degree of crystallinity, and their proportion decreases with increasing calcination temperature. XPS results show the α-Fe2O3 surface enriched with Fe2+ ions, whose proportion increases with increasing calcination temperature, which leads to an increase in the lattice oxygen binding energy and a decrease in the α-Fe2O3 reactivity regarding hydrogen.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gao, Huabo, Molokeev M. S., Chen, Qi, Min, Xin, Ma, Bin
Заглавие : Novel AMoO4:Eu3+ (A = Ca and Ba) optical thermometer: Investigation of effect of local ionic coordination environment on optical performance and temperature measurement sensitivity
Место публикации : Ceram. Int. - 2023. - Vol. 49, Is. 16. - P.26803-26810. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2023.05.217. - ISSN 18733956 (eISSN)
Примечания : Cited References: 52. - The work was supported by the program of Science and Technology International Cooperation Project of Qinghai province (No. 2022-HZ-807) and the National Natural Science Foundation of China (Grant No. 51802172), and was carried out within the framework of the Strategic Academic Leadership Program “Priority-2030′′ for the Siberian Federal University
Аннотация: A range of Eu3+-doped AMoO4 (A = Ca and Ba) phosphors were successfully synthetized, and their crystal structures, optical performance, and temperature measurement sensitivities were investigated in detail. Peak doping concentration of CaMoO4:Eu3+ phosphor was 0.18, while peak doping concentration of BaMoO4:Eu3+ phosphor may be greater than 0.18. Then, temperature-dependent photoluminescence emission spectra of representative CaMoO4:0.09Eu3+ and BaMoO4:0.03Eu3+ phosphors were recorded. CaMoO4:0.09Eu3+ phosphor exhibited abnormal thermal quenching, which was attributed to defects caused by heterovalent substitution of ions and increase in the temperature, and good thermal stability. Finally, the possibility of using both phosphors as optical thermometers was discussed, which exhibited good temperature sensitivity. However, CaMoO4:0.09Eu3+ phosphor exhibited two peak absolute (Sa, 1.28 %K−1 and 1.39 %K−1) and relative sensitivities (Sr, 1.21 %K−1 and 1.20 %K−1). In addition, variation trend of Sr value with temperature was considerably peculiar. Two optimum Sa and Sr values were attributed to abnormal thermal quenching of CaMoO4:0.09Eu3+ phosphor. Peak Sa and Sr values of BaMoO4:0.03Eu3+ phosphor was 12.39 %K−1 and 0.89 %K−1, respectively. In addition, Sa of AMoO4:Eu3+ phosphor was negatively related to Eu3+ central asymmetry, while peak Sr value was more inclined to appropriate ionic central asymmetry.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Sitnikov M. N., Kharkov A. M., Abdelbaki H.
Заглавие : Effect of the electrical inhomogeneity on the magnetocapacitance sign change in the HoxMn1−xS semiconductors upon temperature and frequency variation
Место публикации : J. Mater. Sci.: Mater. Electron. - 2023. - Vol. 34, Is. 4. - Ст.284. - ISSN 1573-482X, DOI 10.1007/s10854-022-09731-3
Примечания : Cited References: 32. - Council on grants of the President of the Russian Federation, MK-620.2021.1.2, Maksim Sitnikov
Аннотация: The dielectric properties of the HoxMn1−xS (x ≤ 0.1) semiconductors in the frequency range of 100 ˂ ω ˂ 106 Hz at temperatures of 80−550 K have been studied. The temperature crossover from the Debye behavior of the permittivity to the resonance behavior has been found at low holmium concentrations in the compounds. The frequency of the crossover from the migration to dipole orientation polarization with the minimum dielectric loss has been determined. The positive and negative magnetocapacitances for two concentrations of holmium ions have been found. The temperature and frequency ranges of the magnetocapacitance sign change have been established and this phenomenon has been explained using the model of the transition from electrically inhomogeneous to homogeneous states.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Каравайский, Андрей Юрьевич, Лукин, Юрий Иванович
Заглавие : Влияние диэлектрических релаксаций почвенной воды на температурную зависимость диэлектрической проницаемости почвы
Место публикации : Журн. радиоэлектрон. - 2023. - № 1. - Ст.4. - ISSN 16841719 (eISSN), DOI 10.30898/1684-1719.2023.1.4; J. Radio Electron.
Примечания : Библиогр.: 23. - Работа выполнена при финансовой поддержке Российского научного фонда и Красноярского краевого фонда поддержки научной и научно-технической деятельности в рамках научного проекта № 22-27-20112
Аннотация: С помощью обобщенной рефракционной диэлектрической модели смеси изучено влияние спектров относительной диэлектрической проницаемости связанной и несвязанной воды в минеральной почве на характер температурной зависимости относительной диэлектрической проницаемости естественной минеральной почвы, с содержанием глинистой фракции 41,3 %, в диапазоне частот электромагнитного поля от 50 МГц до 15 ГГц. Изучены причины появления пересечений спектров относительной диэлектрической проницаемости минеральной почвы, полученных при различных температурах, но для образца одной влажности. Доказано, что появление такой точки пересечения в диапазоне частот до 1,5 ГГц связано с эффектом Максвелла-Вагнера в связанной воде. Изучены зависимости частоты точки пересечения спектров относительной диэлектрической проницаемости минеральной почвы от температуры и объемного содержания связанной и несвязанной воды.The influence of the dielectric constant spectra of bound and unbound water in mineral soil on the temperature dependences of the dielectric constant of mineral soil in the electromagnetic field frequency range from 50 MHz to 15 GHz was studied. The reasons for the appearance of the crossover frequency of the dielectric constant of mineral soil, obtained at different temperatures, but for a sample of the same moisture, were studied. It was proved that the appearance of crossover points in the frequency range up to 1.5 GHz is related to the Maxwell-Wagner effect in bound water. The dependences of the value of the crossover frequency of the dielectric constant of mineral soil on temperature and the volume content of bound and unbound water were studied.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Narkevich N., Vlasov I., Volochaev M. N., Gomorova Y., Mironov Y., Panin S., Berto F., Maksimov P., Deryugin E.
Заглавие : Low-temperature deformation and fracture of Cr-Mn-N stainless steel: Tensile and impact bending tests
Место публикации : Metals. - 2023. - Vol. 13, Is. 1. - Ст.95. - ISSN 20754701 (eISSN), DOI 10.3390/met13010095
Примечания : Cited References: 41. - The research was funded by RSF, project No. 22-29-00438. The low-temperature tensile tests were carried out in accordance with the state assignment for the ISPMS SB RAS, project No. FWRW-2021-0009
Аннотация: The paper presents the results of tensile and impact bending tests of 17%Cr-19%Mn-0.53%N high-nitrogen austenitic stainless steel in temperatures ranging from −196 to 20 °C. The steel microstructure and fracture surfaces were investigated using transmission and scanning electron microscopes, as well as X-ray diffraction analysis. The steel experiences a ductile-to-brittle transition (DBT); however, it possessed high tensile and impact strength characteristics, as well as the ductile fracture behavior at temperatures down to −114 °C. The correspondence between γ–ε microstructure and fracture surface morphologies was revealed after the tensile test at the temperature of −196 °C. In this case, the transgranular brittle and layered fracture surface was induced by ε-martensite formation. Under the impact bending test at −196 °C, the brittle intergranular fracture occurred at the elastic deflection stage without significant plastic strains, which preceded a failure due to the high internal stresses localized at the boundaries of the austenite grains. The stresses were induced by: (i) segregation of nitrogen atoms at the grain boundaries and in the near-boundary regions, (ii) quenching stresses, and (iii) reducing fcc lattice volume with the test temperature decrease and incorporation of nitrogen atoms into fcc austenite lattice. Anisotropy of residual stresses was revealed. This was manifested in the localization of elastic deformations of the fcc lattice and, consequently, the stress localization in 100-oriented grains; this is suggested to be the reason of brittle cleavage fracture.
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