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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Bondarev V. S., Sciau P., Lehmann A. G.
Заглавие : Heat capacity of the PbFe1/2Ta1/2O3 perovskite-like compound
Разночтения заглавия :авие SCOPUS: Heat Capacity of the PbFe1/2Ta1/2O3 Perovskite-Like Compound
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 3. - P521-525. - ISSN 1063-7834, DOI 10.1134/1.1687872
Примечания : Cited References: 26
Предметные рубрики: SINGLE-CRYSTALS
PBFE0.5TA0.5O3
FERROELECTRICS
DIFFRACTION
NIOBATE
GROWTH
Аннотация: The heat capacity C-p(T) of the complex perovskite PbFe1/2Ta1/2O3 has been studied using adiabatic calorimetry in the temperature range 150-370 K. Three diffuse anomalies in C-p(T) are found to exist at temperatures T-d approximate to 350 K, T-m approximate to 250-300 K, and T-c approximate to 205 K. The anomalous and the lattice contribution to the heat capacity are separated, and the change in the entropy is determined. The results of the study are discussed jointly with the data on the structure and physical properties of the compound. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov A. E., Sukhachev A. L., Temerov V. L., Stolbovaya N. A., Edelman I. S.
Заглавие : Magnetic circular dichroism and optical absorption in TmAl3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Magnetic circular dichroism and optical absorption in TmAl 3(BO3)4
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 1. - P34-38. - ISSN 1063-7834, DOI 10.1134/S1063783407010076
Примечания : Cited References: 19
Предметные рубрики: SINGLE-CRYSTALS
SPECTROSCOPY
TRANSITIONS
HUNTITE
GROWTH
Аннотация: The polarized spectra of absorption and magnetic circular dichroism in a TmAl3(BO3)(4) single crystal are studied in the re-ion of H-3(6) - F-3(4), H-3(6) - F-3(3),and H-3(3) - F-3(2) electronic transitions in e Tm3+ ion. The structure of the spectra is interpreted qualitatively. It is shown that the magnetic circular dichroism of the H-3(6) - F-3(4) transition is determined by the contribution from the splitting of the ground state, whereas the magnetic circular dichroism of the H-3(6) - F-3(3) transition is governed by the contribution from the splitting of an excited state in a trigonal crystal field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A.
Заглавие : Metal-insulator transition, magnetoresistance, and magnetic properties of 3d-sulfides (Review)
Место публикации : Low Temp. Phys. - 2006. - Vol. 32, Is. 8-9. - P.725-734. - ISSN 1063-777X, DOI 10.1063/1.2219495; \b Физика низких температур
Примечания : Cited References: 74
Предметные рубрики: GIANT-MAGNETORESISTANCE
PHASE-TRANSITION
ALPHA-MNS
COLOSSAL MAGNETORESISTANCE
SINGLE-CRYSTALS
FES-MNS
SULFIDES
FERROMAGNETISM
SEMICONDUCTORS
TEMPERATURE
Аннотация: The results of a study of the transport and magnetic properties of some sulfides of 3d elements are reported. The concentration transitions with a change of conductivity type and a change of magnetic order are considered, and the features of the colossal magnetoresistance in FexMn1-xS and CuVxCr1-xS2 solid solutions are discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Pankrats A. I., Popov M. A., Balaev A. D., Velikanov D. A., Vorotynov A. M., Sablina K. A., Roessli B., Schefer J., Amato A., Staub U., Boehm M., Ouladdiaf B.
Заглавие : Magnetic properties of copper metaborate CuB2O4
Место публикации : Low Temp. Phys. - 2002. - Vol. 28, Is. 8-9. - P.606-612. - ISSN 1063-777X, DOI 10.1063/1.1511704; \b Физика низких температур
Примечания : Cited References: 17
Предметные рубрики: SINGLE-CRYSTALS
RESONANCE
STATE
Аннотация: The results of experimental research on the magnetic and resonance properties, heat capacity, muon spin relaxation, and neutron scattering of single-crystal copper metaborate CuB2O4 are reviewed. The results of a symmetry analysis and of modeling by the method of the phenomenological thermodynamic potential are presented. The magnetic structure of the crystal in various temperature intervals of the magnetic ordering region is discussed. (C) 2002 American Institute of Physics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Udod L. V., Petrakovskii G. A., Vorotynov A. M., Bayukov O. A., Velikanov D. A., Kartashev A. V., Bovina A. F., Shvedenkov Y. G., Baran M., Szymczak R.
Заглавие : Magnetic properties of aerugite Co10Ge3O16
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 3. - P500-504. - ISSN 1063-7834, DOI 10.1134/S1063783407030201
Примечания : Cited References: 8
Предметные рубрики: SINGLE-CRYSTALS
Аннотация: This paper reports on the first study of the temperature and field dependences of the magnetization, heat capacity, and electrical properties of synthesized polycrystalline samples of aerugite Co10Ge3O16, as well as on x-ray diffraction analysis of this compound. It is shown that the cobalt ions in this compound occupy three nonequivalent positions. The results of the experimental and theoretical studies suggest that aerugite is a ferrimagnet with two uncompensated magnetic moments of the cobalt atom per formula unit.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Reshak, Ali H., Alahmed Z. A., Bila J., Atuchin V. V., Bazarov B. G., Chimitova O. D., Molokeev M. S., Prosvirin, Igor P., Yelisseyev, Alexander P.
Заглавие : Exploration of the electronic structure of monoclinic α-Eu2(MoO4)3: DFT-based study and X-ray photoelectron spectroscopy
Коллективы : Russian Foundation for Basic Research [15-32-50586, 15-52-53080]; Ministry of Education and Science of the Russian Federation; CENTEM project - ERDF as part of the Ministry of Education, Youth and Sports OP RDI program [CZ.1.05/2.1.00/03.0088]; CENTEM PLUS - Ministry of Education, Youth and Sports [LO1402]
Место публикации : J. Phys. Chem. C: American Chemical Society, 2016. - Vol. 120, Is. 19. - P.10559-10568. - ISSN 1932-7447, DOI 10.1021/acs.jpcc.6b01489
Примечания : Cited References:85. - This work was partly supported by the Russian Foundation for Basic Research (Grants 15-32-50586 and 15-52-53080). V.V.A. gratefully acknowledges the Ministry of Education and Science of the Russian Federation for the financial support. A.H.R. would like to acknowledge the CENTEM project, reg. no. CZ.1.05/2.1.00/03.0088, cofunded by the ERDF as part of the Ministry of Education, Youth and Sports OP RDI program and, in the follow-up sustainability stage, supported through CENTEM PLUS (LO1402) by financial means from the Ministry of Education, Youth and Sports under the "National Sustainability Programme I". Computational resources were provided by MetaCentrum (LM2010005) and CERIT-SC (CZ.1.05/3.2.00/08.0144) infrastructures.
Предметные рубрики: Density-functional theory
Solid-solution phosphors
Luminescence properties
Optical-properties
Cleaved surface
Core levels
Vibrational properties
Physical-properties
Crystal-structure
Single-crystals
Аннотация: The powder α-Eu2(MoO4)3 sample was prepared by the solid-state reaction method. The phase purity of the final powder product was verified by X-ray diffraction analysis. The constituent element core levels and valence band are measured by X-ray photoelectron spectroscopy as a function of Ar+ ion (2.5 keV, 7-8 μA/cm2) bombardment time. The formation of Mo5+ and Mo4+ states at high bombardment times was detected. The Eu-O and Mo-O bonding was considered in comparison with other Eu3+- and Mo6+-containing oxides using binding energy difference parameters. The transparency range obtained for the pure α-Eu2(MoO4)3 tablet is λ = 0.41-0.97 μm, as estimated at the transmission level of 5%. The short-wavelength cut edge in α-Eu2(MoO4)3 is governed by the direct allowed optical transitions within the band gap of Eg = 3.74 eV (300 K). The band structure of α-Eu2(MoO4)3 was calculated by ab initio methods and strongly different results were obtained for the spin up/down configurations. The Eu-4f states are located around 2.2 eV and -4.0 eV for spin up (↑) and the structures situated at around 6.5 and 5.5 eV for spin down (↓) configuration. The calculated spin magnetic moments are in excellent relation to the Slater-Pauling rule and within the Eu sphere the magnetic moment of 4f electrons is ∼5.99 μB. © 2016 American Chemical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Sokolov A. E., Zabluda V. N., Shubin A. A., Martyanov O. N.
Заглавие : Magnetic circular dichroism analysis of crude oil
Коллективы : Russian Federation [NSh-2886.2014.2]; Kirensky Institute of Physics (Siberian Branch, Russian Academy of Sciences) [V.44.1.15]; Boreskov Institute of Catalysis (Siberian Branch, Russian Academy of Sciences) [V.44.1.15]
Место публикации : J. Struct. Chem.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 57, Is. 2. - P.382-389. - ISSN 0022-4766, DOI 10.1134/S0022476616020207. - ISSN 1573-8779(eISSN)
Примечания : Cited References:33. - The work was carried out with the partial support of the grant of the President of the Russian Federation (NSh-2886.2014.2), and in the frameworks of the base budget financing of Kirensky Institute of Physics and Boreskov Institute of Catalysis (Siberian Branch, Russian Academy of Sciences) (V.44.1.15.).
Предметные рубрики: Near-UV/visible spectroscopy
Electron-spin-resonance
Asphaltene dispersions
Single-crystals
Absorption
VO2+
EPR
FLuorescence
Aggregation
Absorbency
Ключевые слова (''Своб.индексиров.''): magnetic circular dichroism (mcd)--mcd spectroscopy--absorption spectroscopy of oil
Аннотация: Optical and magneto-optical properties of solutions of crude oil of different origin (i.e., taken from different fields) are studied in the visible and near-UV region of optical emission. Magnetic circular dichroism (MCD) spectra of oil are obtained in the vicinity of wavelengths of ~410 nm, 533 nm, and 576 nm. It is demonstrated that the intensity of the MCD signal depends on the origin of crude oil, and it is proportional to the oil concentration in the solution. The comparison of the magneto-optical spectroscopy data with the chemical composition of samples allows us to conclude that the observed magneto-optical activity is determined by the presence of VO2+ complexes in the oil samples studied. The revealed magneto-optical activity of conventional oil can form a basis of a new method for the analysis of the composition and properties of oil of different origin.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hamann-Borrero J. E., Philipp M., Kataeva O., Zimmermann M. V., Geck J., Klingeler R., Vasiliev A., Bezmaternykh L. N., Buchner B., Hess C.
Заглавие : Nonresonant x-ray magnetic scattering on rare-earth iron borates RFe3(BO3)(4)
Коллективы :
Разночтения заглавия :авие SCOPUS: Nonresonant x-ray magnetic scattering on rare-earth iron borates R Fe 3(BO3)4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2010. - Vol. 82, Is. 9. - Ст.94411. - ISSN 1098-0121, DOI 10.1103/PhysRevB.82.094411
Примечания : Cited References: 38. - This work was supported by the Deustche Forschungsgemeinschaft, through the Forschergruppe FOR520 (Grant No. HE3439/6) and HASYLAB at the Feyerherm from HMI Berlin and specially to Jorg Strempfer from HASYLAB at DESY in Hamburg for valuable discussions.
Предметные рубрики: SINGLE-CRYSTALS
CROSS-SECTION
GDFE3(BO3)(4)
NDFE3(BO3)(4)
DIFFRACTION
MNF2
Аннотация: Hard x-ray scattering experiments with a photon energy of 100 keV were performed as a function of temperature and applied magnetic field on selected compounds of the RFe3(BO3)4 family. The results show the presence of several diffraction features, in particular, nonresonant magnetic reflections in the magnetically ordered phase and structural reflections that violate the diffraction conditions for the low-temperature phase P3(1)21 of the rare-earth iron borates. The temperature and field dependence of the magnetic superlattice reflections corroborate the magnetic structures of the borate compounds obtained by neutron diffraction. The detailed analysis of the intensity and scattering cross section of the magnetic reflection reveals details of the magnetic structure of these materials such as the spin domain structure of NdFe3(BO3)(4) and GdFe3(BO3)(4). Furthermore we find that the correlation length of the magnetic domains is around 100 angstrom for all the compounds and that the Fe moments are rotated 53 degrees +/- 3 degrees off from the hexagonal basal plane in GdFe3(BO3)(4).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liang K. C., Chaudhury R. P., Lorenz B., Sun Y. Y., Bezmaternykh L. N., Temerov V. L., Chu C. W.
Заглавие : Giant magnetoelectric effect in HoAl3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Giant magnetoelectric effect in HoAl 3(BO 3) 4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2011. - Vol. 83, Is. 18. - Ст.180417. - ISSN 1098-0121, DOI 10.1103/PhysRevB.83.180417
Примечания : Cited References: 29. - This work was supported by the DOE, the AFOSR, the T.L.L. Temple Foundation, the J.J. and R. Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston.
Предметные рубрики: ELECTRIC POLARIZATION
SINGLE-CRYSTALS
MULTIFERROICS
FERROELECTRICITY
GDFE3(BO3)(4)
TEMPERATURE
TBPO4
Аннотация: A giant magnetoelectric polarization is found in HoAl3(BO3)(4). The polarization in transverse field geometry at 70 kOe reaches 3600 mu C/m(2), which is significantly higher than reported values of linear magnetoelectric or even multiferroic compounds. The magnetostrictive effect is also measured and compared with the magnetoelectricity. The results show that spin-lattice coupling in HoAl3(BO3)(4) is extremely strong and that the magnetic field causes a large polar distortion of the ionic positions in the unit cell.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskiy G. A., Zuberek R., Nabialek A., Boem M., Sokolov V. V., Bovina A. F.
Заглавие : Magnetostriction of FexMn1-xS (x=0.27) Crystals
Коллективы : Siberian Branch, Russian Academy of Sciences; INTAS [06-1000013-9002]
Разночтения заглавия :авие SCOPUS: Magnetostriction of FexMn1 - xS (x = 0.27) crystals
Место публикации : JETP Letters. - 2009. - Vol. 90, Is. 3. - P.207-210. - ISSN 0021-3640, DOI 10.1134/S0021364009150107
Примечания : Cited References: 19. - This work was supported by the Siberian Branch, Russian Academy of Sciences, and INTAS, joint project no. 06-1000013-9002.
Предметные рубрики: ALPHA-MNS
SINGLE-CRYSTALS
TRANSITION
MOSSBAUER
Аннотация: The magnetostriction of FexMn1-xS (x = 0.27) single crystals in strong magnetic fields up to 120 kOe has been investigated. It has been found that the magnetostriction reaches colossal values (+/-3 x 10(-4)) atypical of compounds of 3d elements. It has been found that the magnetostriction changes sign when varying temperature and magnetic field; this behavior indicates an important role of the spin-phonon interactions in the formation of the magnetic order in solid solutions of iron-manganese sulfides.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pugachev A. M., Zaytseva, I., V, Malinovsky V. K., Surovtsev, N., V, Gorev M. V., Ivleva L. I., Lykov P. A.
Заглавие : Temperature dependence of the spontaneous polarization, acoustic and strain anomalies in strontium barium niobate crystals of different chemical compositions probed by the second harmonic generation technique
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00399, 19-42-543-016, AAAA-A17-117052410033-9]
Место публикации : Ferroelectrics. - 2020. - Vol. 560, Is. 1. - P.54-60. - ISSN 0015-0193, DOI 10.1080/00150193.2020.1722883. - ISSN 1563-5112(eISSN)
Примечания : Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, projects no. 18-02-00399 and 19-42-543-016 and State assignment No AAAA-A17-117052410033-9.
Предметные рубрики: SINGLE-CRYSTALS
RELAXOR
GROWTH
Аннотация: In SrxBa1-xNb2O6 crystals (x = 0.33, 0.5, 0.61, and 0.75), temperature dependences of spontaneous polarization, strain, elastic modules, and second harmonic generation (SHG) signal are compared. It is revealed that SHG describes the temperature dependences of dipole moments in polar nanoregions in paraelectric phase. In the vicinity of the phase transition in paraelectric phase, SHG reflects the temperature behavior of relatively large and long-lived polar asymmetric regions as indicated by the presence of the intermediate temperature range on the temperature dependence of this nonlinear response.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Belskaya N. A., Moshkina E. M., Bezmaternykh L. N., Vasiliev A. D., Sofronova S. N., Eremina R. M., Eremin E. V., Muftakhutdinov A. R., Cherosov M. A., Ovchinnikov S. G.
Заглавие : Antiferromagnetism of the cation-ordered warwickite system Mn2-xMgxBO4 (x=0.5, 0.6 and 0.7)
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [20-02-00559]; Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science to the research project [18-42243007]
Место публикации : J. Magn. Magn. Mater. - 2020. - Vol. 507. - Ст.166820. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2020.166820. - ISSN 1873-4766(eISSN)
Примечания : Cited References: 39. - The reported study was funded by the Russian Foundation for Basic Research (no. 20-02-00559), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project. 18-42243007.
Предметные рубрики: SPIN-GLASS BEHAVIOR
CRYSTAL-STRUCTURES
SINGLE-CRYSTALS
INSIGHTS
MGFEBO4
Аннотация: X-ray diffraction, heat capacity and magnetic measurements are performed on single crystals of Mn2-xMgxBO4 (x = 0.5, 0.6 and 0.7) with the warwickite structure. The monoclinic symmetry is found for all samples with the space group P21/n. The M1 site is occupied by trivalent Mn ions while the M2 site is occupied by a mixture of divalent Mg and Mn ions. Regular cation and charge distributions are observed, which is unusual for heterometallic warwickites. The local octahedral distortions of M1O6 show the monotonic dependence on the Mg content and are in accordance with the Jahn-Teller distortion. All samples are found to undergo long-range antiferromagnetic ordering with rather low transition temperatures of TN = 16, 14 and 13 K for x = 0.5, 0.6, and 0.7, respectively. The ordering of local octahedral distortions, caused by the strong electron-phonon interaction of the trivalent Mn ions, is proposed to stabilise the cationic ordering and, as a result, the long-range magnetic ordering in the material.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kurus, Alexey, Yelisseyev, Alexander, Lobanov, Sergei, Plyusnin, Pavel, Molokeev M. S., Solovyev, Leonid, Samoshkin, Dmitry, Stankus, Sergei, Melnikova S. V., Isaenko, Lyudmila
Заглавие : Thermophysical properties of lithium thiogallate that are important for optical applications
Коллективы : Russian Science Foundation, RussiaRussian Science Foundation (RSF) [19-12-00085]; RFBRRussian Foundation for Basic Research (RFBR) [20-42-543006\20]; Novosibirsk region [20-42-543006\20]
Место публикации : RSC Adv. - 2021. - Vol. 11, Is. 62. - P.39177-39187. - ISSN 2046-2069(eISSN), DOI 10.1039/d1ra05698k
Примечания : Cited References: 41. - Crystal growth and investigation of physical properties were supported by Russian Science Foundation, Russia (#19-12-00085). Spectroscopic study was performed on a state assignment of the Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences Russia and Ministry of Science and Higher Education, Russia. Measurements of thermal conductivity were funded by RFBR and Novosibirsk region (grant #20-42-543006\20)
Предметные рубрики: NON-ENANTIOMORPHOUS CRYSTAL
MID-IR
SINGLE-CRYSTALS
FLASH METHOD
Аннотация: Lithium thiogallate LiGaS2 is one of the most common nonlinear crystals for mid-IR due to its extreme beam strength and wide transparency range; however, its thermophysical properties have not yet been practically studied. Large crystals of high optical quality are grown. DTA revealed features at 1224 K below melting point (1304 K) that are associated with the oxygen containing compounds of the LiGaO2−xSx type. The thermal conductivity of LiGaS2 (about 10.05 W (m−1 K−1)) and band gap value (3.93 eV at 300 K) are found to be the highest in the LiBC2 family. Isotropic points in the dispersion characteristics for the refractive index are found and LiGaS2-based narrow-band optical filters, smoothly tunable with temperature changes, are demonstrated. Intense blue photoluminescence of anionic vacancies VS is observed at room temperature after annealing LiGaS2 in vacuum, whereas orange low-temperature emission is related to self-trapped excitons. When LiGaS2 crystals are heated, spontaneous luminescence (pyroluminescence) takes place, or thermoluminescence after preliminary UV excitation; the parameters of traps of charge carriers are estimated. The obtained data confirm the high optical stability of this material and open up prospects for the creation of new optical devices based on LiGaS2.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Kazak N. V., Zhandun V. S., Bartolome J., Arauzo A., Belskaya N. A., Bayukov O. A., Bezmaternykh L. N., Ovchinnikov S. G.
Заглавие : Electronic and magnetic states of Fe ions in Co2FeBO5
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [20-02-00559, 21-52-12033]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [19-42-240016]; President Council on Grants [MK-2339.2020.2]; Spanish Ministry of Economy, Industry and Competitiveness (MINECO) [MAT2017-83468-R]; regional Government of Aragon (RASMIA project) [E12-20R]
Место публикации : Dalton Trans. - 2021. - Vol. 50, Is. 28. - P.9735-9745. - ISSN 1477-9226, DOI 10.1039/d1dt00125f. - ISSN 1477-9234(eISSN)
Примечания : Cited References: 41. - The authors acknowledge Prof. I. S. Lyubutin for helpful discussions and a critical reading of the manuscript. This research is funded by the Russian Foundation for Basic Research (project no. 20-02-00559 and 21-52-12033), the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (project no. 19-42-240016) and the President Council on Grants (project no. MK-2339.2020.2). The authors acknowledge financial support from the Spanish Ministry of Economy, Industry and Competitiveness (MINECO Grant No. MAT2017-83468-R and from the regional Government of Aragon (E12-20R RASMIA project)
Предметные рубрики: TOTAL-ENERGY CALCULATIONS
CRYSTAL-STRUCTURE
SINGLE-CRYSTALS
Аннотация: The ludwigite Co2FeBO5 has been studied experimentally using 57Fe Mössbauer spectroscopy and theoretically using DFT + GGA calculations. The room-temperature Mössbauer spectra are composed of four quadrupole doublets corresponding to the high-spin Fe3+ ions in octahedral oxygen coordination. All components undergo splitting below 117 K due to the magnetic hyperfine fields. The DFT + GGA calculations performed for three models of Fe ion distributions have revealed that the ground state corresponds to the “Fe4(HS)” model with the high-spin Fe3+ ions located at the M4 site and the high-spin Co2+ ions located at the M1, M2, and M3 sites. A ferrimagnetic ground state, with the Co and Fe magnetic moments being nearly parallel to the b-axis and a total magnetic moment of circa 1.1μB f.u.−1, was found. The other Fe distributions cause an increase in the local octahedral distortions and transformation of the spin state. The calculated quadrupole splitting values are in good agreement with the experimental values obtained by Mössbauer spectroscopy.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gudim I. A., Demidov A. A., Eremin E. V., Shukla D. K.
Заглавие : Magnetic and magnetodielectric properties of Ho0.5Nd0.5Fe3(BO3)4
Коллективы : Russian Foundation for Basic Research [17-52-45091 IND_a]
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 10. - P.1989-1998. - ISSN 1063-7834, DOI 10.1134/S1063783418100086. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 26. - This study was supported by the Russian Foundation for Basic Research, project no. 17-52-45091 IND_a.
Предметные рубрики: SPIN REORIENTATION
SINGLE-CRYSTALS
GDFE3(BO3)4
Аннотация: The magnetic and magnetodielectric properties of Ho0.5Nd0.5Fe3(BO3)4 ferroborate with the competing Ho–Fe and Nd–Fe exchange couplings have been experimentally and theoretically investigated. Step anomalies in the magnetization curves at the spin-reorientation transition induced by the magnetic field B ║ c have been found. The spontaneous spin-reorientation transition temperature TSR ≈ 8 K has been refined. The measured magnetic properties and observed features are interpreted using a single theoretical approach based on the molecular field approximation and calculations within the crystal field model of the rare-earth ion. Interpretation of the experimental data includes determination of the crystal field parameters for Ho3+ and Nd3+ ions in Ho0.5Nd0.5Fe3(BO3)4 and parameters of the Ho–Fe and Nd–Fe exchange couplings.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Moshkina E. M., Nazarenko I. I., Seryotkin Yu. V., Nepijko S. A., Ksenofontov V., Medjanik K., Veligzhanin A. A., Bezmaternykh L. N.
Заглавие : Crystal growth, structure, magnetic properties and theoretical exchange interaction calculations of Cu2MnBO5
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 420. - P.309-316. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2016.07.019
Примечания : Cited References: 35. - X-ray diffraction experiment was carried out at the Centre on Molecular Design and Ecologically Safe Technologies at the Novosibirsk State University. The reported study was funded by Russian Foundation for Basic Research (RFBR) and Government of Krasnoyarsk Territory according to the research project No. 16-42-243028.
Предметные рубрики: SPIN-GLASS BEHAVIOR
SINGLE-CRYSTALS
SUPEREXCHANGE INTERACTIONS
LUDWIGITE
DIELECTRICS
CO3B2O6NI3B2O6
WARWICKITES
FE3O2BO3
IFEFFIT
NI3B2O6
Ключевые слова (''Своб.индексиров.''): oxyborates--ludwigites--xmcd--exafs--magnetism
Аннотация: Single crystals of ludwigite Cu2MnBO5 were synthesized by flux growth technique. The detailed structural and magnetic characterizations of the synthesized samples have been carried out. The cations composition of the studied crystal was determined using X-ray diffraction and EXAFS technique, the resulting composition differ from the content of the initial Mn2O3–CuO components of the flux. Magnetic susceptibility measurements and the calculations of the exchange integrals in frameworks of indirect coupling model revealed that monoclinic distortions strongly affect exchange interactions and appearance of magnetic ordering phase at the temperature T=93 K. The hypothesis of the existence of several magnetic subsystems was supposed. © 2016 Elsevier B.V.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Peschanskii A. V., Fomin V. I., Gudim I. A.
Заглавие : Raman scattering in multiferroic SmFe3(BO3)4
Место публикации : Low Temp. Phys.: American Institute of Physics, 2016. - Vol. 42, Is. 6. - P.475-483. - ISSN 1063-777X, DOI 10.1063/1.4954783. - ISSN 1090-6517(eISSN)
Примечания : Cited References:21
Предметные рубрики: SINGLE-CRYSTALS
MAGNETOELASTIC PROPERTIES
PHASE-TRANSITIONS
FERROBORATE
PHONONS
Аннотация: Raman spectrum of single-crystal SmFe3(BO3)4 was studied in the frequency range from 3 to 1500 cm−1 at temperatures 10–300 K. All the A 1 and E phonon modes predicted by the group theory for a given symmetry of the crystal were observed. The magnitudes of splitting between the LO and TO components of polar E phonons were determined. It was found that under the transition to a magnetically ordered phase, the behavior of the intensity of the line corresponding to the A 1 vibrational mode is anomalous. It was shown that at low temperatures the spectrum of two-magnon excitations has a complex shape and is observed with both nondiagonal and diagonal components of the scattering tensor. This complex shape reflects the features in the density of states of the magnetic branches. An estimate of the magnon energy Em at the Brillouin zone boundary gave ∼47 cm−1. The structure of the ground multiplet 6 H 5/2 of a Sm+3 ion in paramagnetic and antiferromagnetic states as well as the effect of the magnetic phase transition on it were studied. Electron-phonon interaction for the electronic excitation at 225 cm−1 was revealed.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Gudim, I. A., Nemtsev I. V., Krylova S. N., Shabanov A. V., Krylov A. A.
Заглавие : Raman study of HoFe3(BO3)4 at simultaneously high pressure and high temperature: p–T phase diagram
Коллективы : International GeoRAMAN Conference
Место публикации : J. Raman Spectrosc. - 2017. - Vol. 48, Is. 11. - P.1406-1410. - ISSN 0377-0486, DOI 10.1002/jrs.5078. - ISSN 1097-4555(eISSN)
Примечания : Cited References:35. - Authors are grateful to Prof. A.N. Vtyurin for his valuable discussion. This work was supported by the Russian Foundation for Basic Research (grant no. 17-02-00694)
Предметные рубрики: HYDRATE FORMATION
SINGLE-CRYSTALS
WATER SYSTEM
TRANSITIONS
Ключевые слова (''Своб.индексиров.''): phase transitions--high hydrostatic pressure--ferroborates--p-t phase--diagram--nanocrystal
Аннотация: Raman spectra of a HoFe3(BO3)4 crystal chip has been investigated at simultaneously high temperature and high pressure (up to 7.1 GPa and 560 K). On the basis of Raman analysis, the assignment to one of the two possible crystal phases has been made. The experimental p–T phase diagram of HoFe3(BO3)4 was established. An increase in the pressure leads to an increase in the temperature of transition. The phase boundary equation was obtained. Neither triple points nor a phase with new symmetry was revealed in the phase diagram. A critical point with the temperature T = 560 K and the pressure p = 2.53 GPa was found. The nanocrystals with different shapes began to grow on crystal surface after reaching that point. The composition of new nanocrystals is identical to the composition of initial crystal.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmenko A. M., Mukhin A. A., Ivanov, V. Yu., Komandin G. A., Shuvaev A., Pimenov A., Dziom V., Bezmaternykh L. N., Gudim I. A.
Заглавие : Terahertz spectroscopy of crystal-field transitions in magnetoelectric TmAl3(BO3)4
Коллективы : Russian Foundation for Basic Research [14-02-91000, 15-02-07647, 14-02-00307, 13-02-12442, 15-42-04186]; Sci. school [924.2014.2]; Austrian Science Funds [I815-N16, W-1243, P27098-N27]
Место публикации : Phys. Rev. B: American Physical Society, 2016. - Vol. 94, Is. 17. - Ст.174419. - ISSN 2469-9950, DOI 10.1103/PhysRevB.94.174419. - ISSN 2469-9969(eISSN)
Примечания : Cited References:35. - This work was partially supported by the Russian Foundation for Basic Research (Grants No. 14-02-91000, No. 15-02-07647, No. 14-02-00307, No. 13-02-12442, and No. 15-42-04186), Sci. school-924.2014.2, and by the Austrian Science Funds (Grants No. I815-N16, No. W-1243, and No. P27098-N27).
Предметные рубрики: ELECTRIC POLARIZATION
PHASE-TRANSITIONS
SINGLE-CRYSTALS
Аннотация: Dynamic magnetic properties of magnetoelectric TmAl3(BO3)4 borate have been investigated by terahertz spectroscopy. Crystal-field transitions within the ground multiplet H36 of Tm3+ ions are observed and they are identified as magnetic-dipole transitions from the ground singlet A1 to the next excited doublet E of Tm3+ ions. Unexpected fine structure of the transitions is detected at low temperatures. The new modes are assigned to local distortions of the sites with D3 symmetry by Bi3+ impurities, which resulted in the splitting of the A1→E transition. Two types of locally distorted sites are identified and investigated. The main contribution to the static magnetic susceptibility is shown to be determined by the matrix elements of the observed magnetic transitions. We demonstrate that even in case of local distortions the symmetry of the undistorted crystal is recovered for magnetic and for quadratic magnetoelectric susceptibilities.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Beisel N. F., Galashov E. N., Mandrik E. M., Molokeev M. S., Yelisseyev A. P., Yusuf A. A., Xia Z.
Заглавие : Pressure-stimulated synthesis and luminescence properties of microcrystalline (Lu,Y)3Al5O12:Ce3+ garnet phosphors
Место публикации : ACS Appl. Mater. Interfaces: American Chemical Society, 2015. - Vol. 7, Is. 47. - P.26235-26243. - ISSN 19448244 (ISSN), DOI 10.1021/acsami.5b08411
Примечания : Cited References: 75. - This work was partly supported by the National Natural Science Foundations of China (Grant Nos. 51272242 and 51511130035) and the Russian Foundation for Basic Research (Grant No. 15-52-53080 GFEN_a). V.V.A. was partly supported by the Ministry of Education and Science of the Russian Federation
Предметные рубрики: LASER MASS-SPECTROMETRY
LIGHT-EMITTING-DIODES
WHITE-LIGHT
SINGLE-CRYSTALS
OPTICAL-PROPERTIES
ELECTRONIC-STRUCTURE
VIBRATIONAL PROPERTIES
PHASE-TRANSITIONS
PARTICLE-SIZE
GROWTH
Ключевые слова (''Своб.индексиров.''): synthesis--pressure--garnet--structure--luminescence--phosphor
Аннотация: The Lu2.98Ce0.01Y0.01Al5O12 and Y2.99Ce0.01Al5O12 phosphors were synthesized by solid state reaction at temperature 1623 K and pressure 1.5 × 107 Pa in (95% N2 + 5% H2) atmosphere. Under the conditions, the compounds crystallize in the form of isolated euhedral partly faceted microcrystals ∼19 μm in size. The crystal structures of the Lu2.98Ce0.01Y0.01Al5O12 and Y2.99Ce0.01Al5O12 garnets have been obtained by Rietveld analysis. The photoluminescence (PL) and X-ray excited luminescence (XL) spectra obtained at room temperature indicate broad asymmetric bands with maxima near 519 and 540 nm for Y2.99Ce0.01Al5O12 and Lu2.98Ce0.01Y0.01Al5O12, respectively. The light source was fabricated using the powder Lu2.98Ce0.01Y0.01Al5O12 phosphor and commercial blue-emitting n-UV LED chips (λex = 450 nm). It is found that the CIE chromaticity coordinates are (x = 0.388, y = 0.563) with the warm white light emission correlated color temperature (CCT) of 6400 K and good luminous efficiency of 110 lm/W. © 2015 American Chemical Society.
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