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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jiang, Xingxing, Yang, Y.i., Molokeev M. S., Gong, Pifu, Liang, Fei, Wang, Shuaihua, Liu, Lei, Wu, Xiang, Li, Xiaodong, Li, Yanchun, Wu, Shaofan, Li, Wei, Wu, Yicheng, Lin, Zheshuai
Заглавие : Zero linear compressibility in nondense borates with a "Lu-Ban stool"-like structure
Место публикации : Adv. Mater. - 2018. - Vol. 30, Is. 32. - Ст.1801313. - ISSN 0935-9648, DOI 10.1002/adma.201801313. - ISSN 1521-4095(eISSN)
Примечания : Cited References: 28. - X.J., Y.Y., and M.M. contributed equally to this work. The authors acknowledge Zhuohong Yin for useful discussions. This work was supported by the National Scientific Foundations of China (Grant Nos. 11474292, 51702330, 11611530680, 91622118, and 91622124), Russian Foundation for Basic Research (Grant No. 17-52-53031), the Special Foundation of the Director of Technical Institute of Physics and Chemistry (TIPC), the China "863" project (No. 2015AA034203), key project of Beijing Synchrotron Radiation Facility and the Youth Innovation Promotion Association, CAS (outstanding member for Z.L. and Grant No. 2017035 for X.J.).
Предметные рубрики: MECHANICAL METAMATERIALS
PRESSURE
METABORATE
STRENGTH
Ключевые слова (''Своб.индексиров.''): borates--"lu-ban stool"-like structure--ultraviolet transparency--zero--linear compressibility
Аннотация: Discovering materials that exhibit zero linear compressibility (ZLC) behavior under hydrostatic pressure is extremely difficult. To date, only a handful of ZLC materials have been found, and almost all of them are ultrahard materials with densified structures. Here, to explore ZLC in nondense materials, a structural model analogous to the structure of the “Lu‐Ban stool,” a product of traditional Chinese woodworking invented 2500 years ago, is proposed. The application of this model to borates leads to the discovery of ZLC in AEB2O4 (AE = Ca and Sr) with the unique “Lu‐Ban stool”‐like structure, which can obtain a subtle mechanical balance between pressure‐induced expansion and contraction effects. Coupled with the very wide ultraviolet transparent windows, the ZLC behavior of AEB2O4 may result in some unique but important applications. The applications of the “Lu‐Ban stool” model open a new route for pursuing ZLC materials in nondense structural systems.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Boldyrev K. N., Popova M. N., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Uncontrolled impurity of Bi3+ in rare-earth iron borates RFe3(BO3)4
Коллективы : International Conference on the Physics of Optical Materials and Devices
Место публикации : The 4th International Conference on the Physics of Optical Materials and Devices. ICOM 2015: book of abstracts. - 2015. - P.262. - ISBN 978-86-7306-134-4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bedarev V. A., Pashchenko M. I., Merenkov D. N., Savina Y. O., Pashchenko V. O., Gnatchenko S. L., Bezmaternykh L. N., Temerov V. L.
Заглавие : The Faraday effect in TbFe3(BO3)4 and TbAl3(BO3)4 borates
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2014. - Vol. 362. - P.150-153. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2014.03.034. - ISSN 1873-4766
Примечания : Cited References: 16
Ключевые слова (''Своб.индексиров.''): antiferromagnet--faraday rotation--magnetization
Аннотация: The magnetic field dependences of the Faraday rotation of light and the magnetization of antiferromagnet TbFe3(BO3)(4) and paramagnet TbAl3(BO3)(4) compounds have been investigated. It is established that the main contribution to the Faraday rotation in the TbFe3(BO3)(4) is associated with the Tb3+ subsystem at low temperatures. The antiferromagnetic ordering effects on this contribution is shown. (C) 2014 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmenko A. M., Ivanov V. Yu., Tikhanovsky A. Yu., Pimenov A. G., Shuvaev A. M., Gudim I. A., Mukhin A. A.
Заглавие : Terahertz spectroscopy of magnetoelectric HoAl3(BO3)4
Колич.характеристики :6 с
Место публикации : Opt. Spectrosc. - 2023. - Vol. 131, Is. 6. - P.409-414. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X23020121. - ISSN 15626911 (eISSN)
Примечания : Cited References: 18. - This study was partially financially supported by the Russian Science Foundation (project 16-12-10531)
Аннотация: Experimental and theoretical study of submillimeter (terahertz) spectroscopic and magnetic properties of the rare-earth aluminum borate HoAl3(BO3)4 were performed at temperatures 3–300K. In the transmittance spectra a number of resonance lines were detected at frequencies 2–35 cm–1 for different radiation polarizations. These modes were identified as transitions between the lower levels of the ground multiplet of the Ho3+ ion split by the crystal field, including both transitions from the ground state to the excited ones and transitions between the excited states. The established excitation conditions of the observed modes and the simulation of the spectra made it possible to separate the magnetic and electric dipole transitions and to determine the energies of the corresponding states, their symmetry, and the matrix elements of the transitions. Low-frequency lines that do not fit into the established picture of the electron states of Ho3+ were also found; these lines, apparently, correspond to the ions with the distorted by defects local symmetry of the crystal field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmenko A. M., Ivanov V. Yu., Tikhanovskii A. Yu. A. Yu., Pimenov A., Shuvaev A., Gudim I. A., Mukhin A. A.
Заглавие : Terahertz spectroscopy of magnetoelectric HoAl3(BO3)4
Колич.характеристики :6 с
Место публикации : Opt. Spectrosc. - 2022. - Vol. 130, Is. 1. - P.54-59. - ISSN 0030400X (ISSN), DOI 10.21883/EOS.2022.01.52987.33-21. - ISSN 15626911 (eISSN)
Примечания : Cited References: 18. - This study was partially financially supported by the Russian Science Foundation (project 16-12-10531)
Аннотация: Experimental and theoretical study of submillimeter (terahertz) spectroscopic and magnetic properties of the rare-earth aluminum borate HoAl3(BO3)4 were performed at temperatures 3–300 K. In the transmittance spectra a number of resonance lines were detected at frequencies 2–35 cm-1 for different radiation polarizations. These modes were identified as transitions between the lower levels of the ground multiplet of the Ho3+ ion split by the crystal field, including both transitions from the ground state to the excited ones and transitions between the excited states. The established excitation conditions of the observed modes and the simulation of the spectra made it possible to separate the magnetic and electric dipole transitions and to determine the energies of the corresponding states, their symmetry, and the matrix elements of the transitions. Low-frequency lines that do not fit into the established picture of the electron states of Ho3+ were also found; these lines, apparently, correspond to the ions with the distorted by defects local symmetry of the crystal field.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhlin A. A., Kuzmenko A. M., Ivanov V. Yu., Shuvaev A., Dziom V., Pimenov A., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Terahertz magnetoelectric phenomena in rare-earth borates
Коллективы : Novel Trends in Physics of Ferroics, International Workshop , "Новые направления в развитии физики ферроиков", международный семинар, Физико-технический институт им. А.Ф. Иоффе РАН
Место публикации : Second Int. Workshop "Novel Trends in Physics of Ferroics": abstracts. - 2017. - P.34
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kazak N. V., Bel’skaya N. A., Knyazev Yu. V., Molokeev M. S., Bezmaternykh L. N., Velikanov D. A., Yumashev V. V., Gavrilkin, S. Yu., Ovchinnikov S. G.
Заглавие : Temperature- and field-induced magnetic transitions in the cobalt-containing borates
Коллективы : "Functional materials", International conference, Крымский федеральный университет имени В.И. Вернадского
Место публикации : Ovchinnikov S. G. International conference "Functional materials": book of abstracts/ ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P.31
Примечания : Библиогр.: 5 назв. - This work has been financed by the Russian Foundation for Basic Research (project no.20-02-00559).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grossman V. G., Bazarov B. G., Stefanovich S. Y., Molokeev M. S., Bazarova J. G.
Заглавие : Synthesis, structure and properties of K2(1-x)Rb2xAl2B2O7 and Cs1.39Tl0.61Al2B2O7 borates as the basis for preparing new oxide materials
Коллективы : [0339-2016-0007]
Место публикации : Lett. Mater. - 2019. - Vol. 9, Is. 1. - P.86-90. - ISSN 2218-5046, DOI 10.22226/2410-3535-2019-1-86-90; Письма о материалах. - ISSN 2410-3535(eISSN)
Примечания : Cited References:22. - The research was carried out within the state assignment of FASO of Russia (Theme No 0339-2016-0007).
Предметные рубрики: OPTICAL-PROPERTIES
CRYSTAL-STRUCTURE
K2Al2B2O7
GROWTH
Аннотация: With the development of technology, the need for highly efficient functional materials is steadily increasing. Currently, borates attract the attention of researchers, as they are promising nonlinear materials. Potassium rubidium aluminum borate based on potassium aluminum borate (trigonal syngony, space group P321, Z = 3) was obtained by solid-phase synthesis. The individuality and purity of the borates were confirmed by X-ray diffraction. Analysis of differential scanning calorimetry and thermogravimetric method for K2(1‑x)Rb2xAl2B2O7 (x = 0.1– 0.8) was performed in the temperature range of 25–1075°С. Potassium rubidium borates decompose in the temperature range of 900 –1000°C. Differential scanning calorimetry, dielectric loss tangent, and second-harmonic generation data revealed phase transitions for K0.6Rb1.4Al2B2O7. A significant SHG effect was found at room temperature for K0.6Rb1.4Al2B2O7 (Q = 70). Then the SHG effect increases to Q = 85 at a temperature of 645°C and remains constant with a further increase in temperature. The new triple borate Cs1.39Tl0.61Al2B2O7 was synthesized by the solid-phase synthesis, and its crystallographic parameters were obtained by the Rietveld method. This borate crystallizes in the monoclinic space group P21 / c with the unit cell parameters: Z = 2, a = 6.6669(3) Å, b = 7.2991(3) Å , c = 9.3589(4) Å , β =116.6795(18)°, V = 406.94(3) Å 3. The structure can be considered to be built up from the nearly planar [Al2B2O10] rings, which are composed of two AlO4 tetrahedra and two BO3 triangles, connected, alternately to each other by corner-sharing.С развитием технологии потребность в высокоэффективных функциональных материалах растет. В настоящее время бораты привлекают внимание исследователей, поскольку они являются перспективными нелинейными материалами. Твердофазным синтезом получены бораты K2(1-x)Rb2xAl2B2O7 (x = 0.1–0.8) на основе калий-алюминиевого бората (тригональная сингония, пространственная группа P321, Z = 3). Индивидуальность и чистота боратов подтверждена рентгеновской дифракцией. Анализ дифференциально-сканирующей калориметрией и термогравиметрическим методом для K2(1-x)Rb2xAl2B2O7 (x = 0.1–0.8) был проведен в интервале температур 25–1075 ºС. Калий-рубидиевые бораты разлагаются в интервале температур 900–1000 °C. Дифференциальной сканирующей калориметрией, диэлектрическими измерениями и методом генерации второй оптической гармоники выявлены фазовые переходы для K0.6Rb1.4Al2B2O7. Значительный ГВГ-эффект был обнаружен при комнатной температуре для K0.6Rb1.4Al2B2O7 (Q = 70). Эффект генерации второй гармоники возрастает до Q = 85 при температуре 645 °C и остается постоянным при дальнейшем увеличении температуры. Новый тройной борат Cs1.39Tl0.61Al2B2O7 был синтезирован методом твердофазного синтеза, а его кристаллографические параметры были получены с помощью метода Ритвельда. Этот борат кристаллизуется в моноклинной пространственной группе P21/c с параметрами элементарной ячейки: Z = 2, a = 6.6669 (3) Å, b = 7.2991 (3) Å, c = 9.3589 (4) Å, β = 116.6795 (18)º, V = 406.94 (3) Å3. Структуру можно представить в виде почти плоских колец [Al2B2O10], которые состоят из двух тетраэдров AlO4 и двух BO3 треугольников, соединенных попеременно друг с другом посредством вершин.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkova E. A., Platunov M. S., Antipin A. M., Alpanova R. R., Dubrovskiy A. A., Pyastolova Yu. V., Podobraznyh A. D., Kosorukov V. L., Koporulina E. V., Maltsev V. V.
Заглавие : Synthesis, structure and magnetic properties of monoclinic lanthanum-chromium borate LaCr3(BO3)4
Колич.характеристики :9 с
Место публикации : J. Alloys Compd. - 2024. - Vol. 994. - Ст.174683. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2024.174683. - ISSN 1873-4669
Примечания : Cited References: 38. - Single crystal X-ray analysis was carried out within the State assignment NRC "Kurchatov institute" (research contribution of A.M.A.). The research contribution of M.S.P. was partially supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental assignment for Synchrotron radiation facility "SKIF", Boreskov Institute of Catalysis (project FWUR-2024–0040)
Аннотация: Single crystals of LaCr3(BO3)4 were synthesized through spontaneous nucleation from a K2Mo3O10 flux melt. The crystal structure was determined using single-crystal X-ray diffraction (XRD) at temperatures of 293 K and 85 K. LaCr-borate crystallizes in the monoclinic C2/c space group with unit cell parameters a = 7.47980(5) Å, b = 9.55180(7) Å, c = 11.48330(8) Å, β= 104.0060(6)°, V = 796.04(1) Å3 (for C1, T = 293 K), and a = 7.47380(5) Å, b = 9.55520(7) Å, c = 11.47100(8) Å, β = 103.9330(6)°, V = 795.08(1) Å3 (for C2, T = 85 K), each with Z = 4. The temperature dependence of the unit cell parameters, including the monoclinic angle (β) and the unit cell volume (V), was investigated over the range of 85–293 K. No structural phase transitions were observed in the low-temperature region down to 85 K. Differential scanning calorimetry (DSC) measurements revealed no high-temperature phase transitions between 50 and 1350°C. Infrared (IR) spectroscopy confirmed the monoclinic structure of LaCr3(BO3)4 crystals, revealing characteristic absorption bands, including the lowest frequency mode associated with the translational vibrations of the La3+ ion.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Atuchin V. V., Bazarov B. G., Grossman V. G., Lin Z., Molokeev M. S., Bazarova Zh.G.
Заглавие : Synthesis, crystal and valence band structure of nonlinear optical borates K2(1-x)Rb2xAl2B2O7
Коллективы : Российский национальный комитет по теоретической и прикладной механике, Объединенный Научный совет РАН по комплексной проблеме "Механика", Научный совет по механике деформируемого твердого тела РАН, Институт проблем механики им. А.Ю. Ишлинского РАН, Институт проблем машиноведения РАН, Алтайский государственный технический университет им. И.И. Ползунова, Российский фонд фундаментальных исследований, "Сессия Научного совета РАН по механике", Всероссийская конференция (6; 26-31 июля 2012; Барнаул/ Белокуриха, Россия)
Место публикации : VI Сессия Научного совета РАН по механике: материалы всероссийской конференции. - Барнаул, 2012. - P.91. - ISBN 5756809376
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuznetsov A. B., Kokh K. A., Sagatov N., Gavryushkin P. N., Molokeev M. S., Svetlichnyi V. A., Lapin I. N., Kononova N. G., Shevchenko V. S., Bolatov A., Uralbekov B., Goreiavcheva A. A., Kokh A. E.
Заглавие : Synthesis and growth of rare earth borates NaSrR(BO3)2 (R = Ho-Lu, Y, Sc)
Место публикации : Inorg. Chem. - 2022. - Vol. 61, Is. 19. - P.7497-7505. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.2c00596
Примечания : Cited References: 51
Аннотация: NaSrR(BO3)2 (R = Ho-Lu, Y, Sc) compounds were obtained for the first time. Their structures exhibit disordered positions of Sr2+ and Na+ atoms while RO6 polyhedra are connected through the BO3 groups. Large distances between R atoms and high transparency in the range of 250-900 nm make them promising for phosphor applications. A pathway to obtain single crystals was shown by growing NaSrY(BO3)2 and NaSrYb(BO3)2 by the top seeded solution growth method with Na2O-B2O3-NaF flux.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmenko A. M., Szaller D., Kain T., Dziom V., Weymann L., Shuvaev A., Pimenov A., Mukhin A. A., Ivanov V. Y., Gudim I. A., Bezmaternykh L. N., Pimenov A.
Заглавие : Switching of magnons by electric and magnetic fields in multiferroic borates
Место публикации : Phys. Rev. Lett. - 2018. - Vol. 120, Is. 2. - Ст.027203. - ISSN 00319007 (ISSN), DOI 10.1103/PhysRevLett.120.027203
Примечания : Cited References: 72
Ключевые слова (''Своб.индексиров.''): electric and magnetic fields--electric manipulation--excitation conditions--high frequency hf--materials research--multiferroic materials--spin orientations--terahertz radiation
Аннотация: Electric manipulation of magnetic properties is a key problem of materials research. To fulfill the requirements of modern electronics, these processes must be shifted to high frequencies. In multiferroic materials, this may be achieved by electric and magnetic control of their fundamental excitations. Here we identify magnetic vibrations in multiferroic iron borates that are simultaneously sensitive to external electric and magnetic fields. Nearly 100% modulation of the terahertz radiation in an external field is demonstrated for SmFe3(BO3)4. High sensitivity can be explained by a modification of the spin orientation that controls the excitation conditions in multiferroic borates. These experiments demonstrate the possibility to alter terahertz magnetic properties of materials independently by external electric and magnetic fields.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bayukov O. A., Gavrilyuk A. M., Zabluda V. N., Lyubutin I. S., Ovchinnikov S. G., Potseluyko A. M., Tomas M., Trojan I. A., Kharlamova S. A.
Заглавие : Studies of magnetic and optic properties of rare-earth gallo-ferroborates by Mossbauer and optical spectroscopy
Место публикации : Physica B: ELSEVIER SCIENCE BV, 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P1321-1323. - ISSN 0921-4526, DOI 10.1016/j.physb.2005.01.397
Примечания : Cited References: 3
Ключевые слова (''Своб.индексиров.''): strongly correlated electron system--antiferromagnets--borates--antiferromagnets--borates--strongly correlated electron system--antiferromagnetism--cryostats--energy gap--magnetic moments--magnetic properties--mossbauer spectroscopy--optical properties--single crystals--borates--coulomb correlations--liquid helium--strongly correlated electron systems--gadolinium compounds
Аннотация: Magnetic and optical properties of GdFe3-xGax(BO3)(4) single crystals are investigated by Mossbauer and optical spectroscopy. The GdFe3(BO3)(4) multielectron band structure model is derived. A high- and low-spin crossover of Fe3+ ion, a collapse of the magnetic moment, the suppression of Coulomb correlations, and insulator-semiconductor transition are predicted. The jump of an energy gap is measured at pressure 43 GPa. (c) 2005 Elsevier B.V. All rights reserved.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smirnova E., Alekseeva O. A., Dudka A. P., Verin I. A., Artemov V. V., Khmelenin D. N., Gudim I. A., Frolov K. V., Lyubutin I. S.
Заглавие : Structural peculiarities of bismuth-containing RFe3(BO3)4 (R = Ho, Y, Sm, Nd)
Коллективы : Congress of the International Union of Crystallography , Ministry of Science and Higher Education within the State assignment FSRC 'Crystallography and Photonics' RAS
Место публикации : Acta Crystallogr. A. - 2021. - Vol. 77, Supplement. - P.C1237-C1237. - ISSN 2053-2733, DOI 10.1107/S0108767321084749
Примечания : Cited References: 4. - This work was performed using the equipment of the Shared Research Center FSRC 'Crystallography and Photonics' RAS and was supported by the Ministry of Science and Higher Education within the State assignment FSRC 'Crystallography and Photonics' RAS
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chukalina E. P., Popova M. N., Bezmaternykh L. N., Gudim I. A.
Заглавие : Spectroscopic study of the magnetic ordering in SmFe3(BO3)(4)
Коллективы :
Разночтения заглавия :авие SCOPUS: Spectroscopic study of the magnetic ordering in SmFe3(BO3)4
Место публикации : Phys. Lett. A: ELSEVIER SCIENCE BV, 2010. - Vol. 374, Is. 15-16. - P1790-1792. - ISSN 0375-9601, DOI 10.1016/j.physleta.2010.02.018
Примечания : Cited References: 20. - The authors thank B.Z. Malkin and S.A. Klinnin for helpful discussions and K.N. Boldyrev for participating in some low-temperatures measurements. This work was supported in part by the Russian Foundation for Basic Research (grants Nos. 10-02-01071 and 10-02-00765), and by the Russian Academy of Sciences under the Programs for Basic Research.
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
SINGLE-CRYSTAL
DYFE3(BO3)(4)
Ключевые слова (''Своб.индексиров.''): rare-earth iron borates--magnetic ordering--optical spectroscopy--magnetic ordering--optical spectroscopy--rare-earth iron borates
Аннотация: SmFe3(BO3)(4) belongs to the family of rare-earth RFe3(BO3)(4) multiferroics. We present the first measurements of the optical spectra of SmFe3(BO3)(4) (on single crystals) and report the data on the crystal-field levels and their symmetries for the ground multiplet H-6(5/2) [0 (Gamma(4)). 135 (Gamma(56)), and 220 (Gamma(4)) cm(-1)] and on the ground-state exchange splitting (13.2 cm(-1) at 1.7 K), important to interpret the magnetic, magnetoelectric, and thermodynamic properties of this compound. The observed exchange splitting of the Sm3+ Kramers doublets manifests the magnetic ordering in SmFe3(BO3)(4) at 32 +/- 1 K. From a comparison of the temperature-dependent spectra of the Sm3+ ion in SmFe3(BO3)(4) and in Nd-Gd mixed iron borate where the magnetic spin reorientation has been found earlier, we suggest the easy-plane arrangement of the Fe spins in SmFe3(BO3)(4). The samarium iron borate preserves the R32 (D-3(7)) crystal structure at all the investigated temperatures (down to 1.7 K). (C) 2010 Elsevier B.V. All rights reserved.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Boldyrev K. N., Klimin S. A., Stanislavchuk T. N., Sirenko A. A., Bezmaternykh L. N.
Заглавие : Spectral signatures of spin-phonon and electron-phonon interactions in multiferroic iron borates
Коллективы : Moscow International Symposium on Magnetism , Russian Science Foundation [14-12-01033], U.S. Department of Energy [DE-FG02-07ER46382, DE-AC02-98CH10886]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2015. - Vol. 383. - P.250-254. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2014.10.095. - ISSN 1873-4766 (eISSN)
Примечания : Cited References:32. - This work was supported by the Russian Science Foundation (Grant no. 14-12-01033). Experiments at U4-IR beamline NSLS-BNL (T.N.S. and A.A.S.) were performed under Contract no. DE-FG02-07ER46382 from the U.S. Department of Energy. The National Synchrotron Light Source is operated as a User Facility for the U.S. Department of Energy under Contract no. DE-AC02-98CH10886. M.N.P. thanks B.Z. Malkin for helpful discussions.
Предметные рубрики: SMFE3(BO3)4
SPECTROSCOPY
CRYSTALS
SM
Ключевые слова (''Своб.индексиров.''): rare-earth iron borates--spin phonon interactions--electron phonon coupling--optical spectroscopy
Аннотация: High-resolution far-infrared reflection and polarized ellipsometry, as well as Raman scattering temperature-dependent measurements are used to study spin-phonon and electron-phonon interactions in rare-earth (RE) iron borates with the R32 structure of a natural mineral huntite, namely, in RFe3(BO3)4 with R=Pr, Nd, and Sm. Pronounced peculiarities in the ω(T) dependences at the Néel temperature TN≈32 K are observed for all the compounds studied and the origin of these peculiarities is discussed. A coupling between lattice phonons and crystal-field excitations of a RE ion manifests itself by a renormalization of frequencies and intensities of coupled modes. Modeling of the spectra has revealed the value of about 15 cm−1 for the electron–phonon coupling constant in PrFe3(BO3)4.Высокоразрешающая эллипсометрия дальнего инфракрасного отражения и поляризованный света, а также температурнозависимые измерения комбинационного рассеяния используются для изучения спин-фононных и электрон-фононных взаимодействий в редкоземельных (RE) боратах железа со структурой R32 природного минерала хантита , а именно, в RFe3 (BO3) 4 с R = Pr, Nd, и Sm. Выраженные особенности ω (T) зависимостей при температуре Нееля TN ≈32 K наблюдаются для всех исследованных соединений и происхождение этих особенностей обсуждается.Связь между фононами решетки и возбуждениями кристаллического поля РЗ иона проявляется себя перенормализации частоты и интенсивности связанных мод. Моделирование спектров показал значение около 15cm-1 для константы электрон-фононной связи в PrFe3 (BO3) 4.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jiang X., Molokeev M. S., Wang N., Wang Y., Wen T., Dong Z., Liu Y., Li W., Lin Z.
Заглавие : sp2 to sp3 hybridization transformation in ionic crystals under unprecedentedly low pressure
Место публикации : Angew. Chem. - 2022. - Vol. 134, Is. 44. - Ст.e202208247. - ISSN 00448249 (ISSN), DOI 10.1002/ange.202208247. - ISSN 15213757 (eISSN)
Примечания : Cited References: 48. - The authors acknowledge Zhuohong Yin for useful discussions and the experimental time provided by the 4W2 beam line of the Beijing Synchrotron Radiation Facility (BSRF). This work was supported by the National Scientific Foundations of China (Grants 51702330, 11974360, 51872297, 51890864, 51802321, 21975132 and 21991143) and the Young Elite Scientist Sponsorship Program by CAST (YESS)
Аннотация: Under cold pressure sp1/sp2-to-sp3 hybridization transformation has been exclusively observed in covalent or molecular crystals overwhelmingly above ≈10 GPa, and the approaches to lower the transition pressure are limited on external heat-treatment and/or catalyzers. Herein we demonstrate that, by internal-lattice stress-transfer from ionic to covalent groups, the transformation can be significantly prompted, as shown in a crystal of LiBO2 under 2.85 GPa for the first case in ionic crystals. This unprecedentedly low transformation pressure is ascribed to the enhanced localized stress on covalent B−O frames transferred from ionic Li−O bonds in LiBO2, and accordingly the corresponding structural feature is summarized. This work provides an internal structural regulation strategy for pressure-reduction of the s-p orbital hybridization transformation and extends the sp1/sp2-to-sp3 transformation landscape from molecular and covalent compounds to ionic systems.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jiang X., Molokeev M. S., Wang N., Wang Y., Wen T., Dong Z., Liu Y., Li W., Lin Z.
Заглавие : sp2 to sp3 hybridization transformation in ionic crystals under unprecedentedly low pressure
Место публикации : Angew. Chem. Int. Ed. - 2022. - Vol. 61, Is. 44. - Ст.e202208247. - ISSN 14337851 (ISSN), DOI 10.1002/anie.202208247
Примечания : Cited References: 48. - The authors acknowledge Zhuohong Yin for useful discussions and the experimental time provided by the 4W2 beam line of the Beijing Synchrotron Radiation Facility (BSRF). This work was supported by the National Scientific Foundations of China (Grants 51702330, 11974360, 51872297, 51890864, 51802321, 21975132 and 21991143) and the Young Elite Scientist Sponsorship Program by CAST (YESS)
Аннотация: Under cold pressure sp1/sp2-to-sp3 hybridization transformation has been exclusively observed in covalent or molecular crystals overwhelmingly above ≈10 GPa, and the approaches to lower the transition pressure are limited on external heat-treatment and/or catalyzers. Herein we demonstrate that, by internal-lattice stress-transfer from ionic to covalent groups, the transformation can be significantly prompted, as shown in a crystal of LiBO2 under 2.85 GPa for the first case in ionic crystals. This unprecedentedly low transformation pressure is ascribed to the enhanced localized stress on covalent B−O frames transferred from ionic Li−O bonds in LiBO2, and accordingly the corresponding structural feature is summarized. This work provides an internal structural regulation strategy for pressure-reduction of the s-p orbital hybridization transformation and extends the sp1/sp2-to-sp3 transformation landscape from molecular and covalent compounds to ionic systems.
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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bazarov B. G., Grossman V. G., Lin Z., Molokeev M. S., Atuchin V. V., Bazarova Zh.G.
Заглавие : Solid state synthesis and band structure of nonlinear borates K2(1-x)Rb2xAl2B2O7
Коллективы : Институт нанотехнологий микроэлектроники РАН, Ульяновский государственный университет, Российский фонд фундаментальных исследований, Академия наук Татарстана, "Opto-, nanoelectronics, nanotechnology, and microsystems", International Conference (2012 ; sept. ; 4-7; Ulyanovsk, Russia), "Опто-, наноэлектроника, нанотехнологии и микросистемы", международная конференция (2013 ; июль.; 26-30; Ульяновск)
Место публикации : XVI Международная конференция "Опто-, наноэлектроника, нанотехнологии и микросистемы": Труды. - Ульяновск, 2012. - P.122
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Nazarenko I. I.
Заглавие : Super-Superexchange Influence on Magnetic Ordering in Ni3B2O6 Kotoite
Место публикации : Phys. Status Solidi B. - 2019. - Vol. 256, Is. 10. - Ст.1900060. - ISSN 03701972 (ISSN) , DOI 10.1002/pssb.201900060
Примечания : Cited References: 22. - The study was carried out with the financial support of the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Science Foundation as part of a research project: “Low-dimensional and frustrated magnetism in nickel oxyborates and manganites with the substitution of manganese by Yang-Teller ions,” No. 18-42-240007.
Аннотация: Using ab initio software package WIEN2k, the calculations of electronic propertiesand of the energies of various magnetically ordered structures are carried out and possible mechanisms of magnetic ordering are analyzed in Ni3B2O6. The superexchange (Ni-O-Ni) and super-superexchange interactions (Ni-O-B-O-Ni) are calculated, a magnetic ordering model is proposed.
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