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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chukalina E. P., Jablunovskis A., Gudim I. A.
Заглавие : Study of the magnetic properties of neodymium and samarium iron borates by the method of erbium spectroscopic probe
Колич.характеристики :7 с
Место публикации : Opt. Spectrosc. - 2023. - Vol. 131, Is. 8. - P.630-636. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X23060024. - ISSN 15626911 (eISSN)
Примечания : Cited References: 30. - This paper was carried out under financial support of the Russian Science Foundation (grant № 19-12-00413)
Аннотация: Iron borates NdFe3(BO3)4 and SmFe3 (BO3)4 activated with 1% erbium, with ahuntite structure (space symmetry group R32) were investigated by the method of erbium spectroscopic probe. From an analysis of the temperature dependence of the transmission spectra in the region of the 4I15/2 → 4113/2 transition in the Er3+ ion, it was found that both studied compounds order antiferromagnetically at TN ≈ 33 K into an easy-plane magnetic structure. No other phase transitions were found.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chukalina E. P., Jablunovskis A., Gudim I. A.
Заглавие : Study of the magnetic properties of neodymium and samarium iron borates by the method of erbium spectroscopic probe
Место публикации : Opt. Spectrosc. - 2022. - Vol. 130, Is. 1. - P.98-104. - ISSN 0030400X (ISSN), DOI 10.21883/EOS.2022.01.52993.23-21. - ISSN 15626911 (eISSN)
Примечания : Cited References: 30. - This paper was carried out under financial support of the Russian Science Foundation (grant № 19-12-00413)
Аннотация: Iron borates NdFe3(BO3)4 and SmFe3(BO3)4 activated with 1% erbium, with a huntite structure (space symmetry group R32) were investigated by the method of erbium spectroscopic probe. From an analysis of the temperature dependence of the transmission spectra in the region of the 4I15/2 → 4I13/2 transition in the Er3+ ion, it was found that both studied compounds order antiferromagnetically at TN ≈ 33 K into an easy-plane magnetic structure. No other phase transitions were found.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Masyugin A. N., Volochaev M. N., Ishibashi T.
Заглавие : Coexistence of the electric polarization and conductive current in the bismuth–neodymium ferrite garnet films
Место публикации : J. Mater. Sci. Mater. Electron. - 2021. - Vol. 32. - P.3766-3781. - ISSN 09574522 (ISSN), DOI 10.1007/s10854-020-05121-9
Примечания : Cited References: 42
Аннотация: The Nd1Bi2Fe5O12/Nd2Bi1Fe4Ga1O12 polycrystalline films on the glass substrate and the Nd0.5Bi2.5Fe5O12 epitaxial films on the single-crystal gadolinium gallium garnet substrate have been investigated by impedance and dielectric spectroscopy. The inductive contribution to the impedance and two relaxation channels related to ferroelectric domains and migration polarization have been established. The magnetocapacitance and magnetoimpedance have been determined. The conductive and polarization currents and the phase difference between them for the films of two types have been determined. The critical temperatures of the polarization disappearance and hysteresis I–V have been found. A model of the polarization caused by the piezoelectric effect and flexoelectric interaction has been proposed. I–V hysteresis is explained by the presence of ferroelectric domains near the interface and is associated with the hysteresis of the electric polarization.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Masyugin A. N., Sitnicov M. N., Rybina U. I., Ishibashi T.
Заглавие : Colossal magnetostriction and electrostriction of bismuth-substituted neodymium iron garnet films
Место публикации : J. Magn. Magn. Mater. - 2018. - Vol. 464. - P.44-49. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2018.05.038
Примечания : Cited References: 27. - This study were supported by the Russian Foundation for Basic Research project №18-52-00009 Bel_a, № 18-32-00079 mol_a, the state order № 3.5743.2017/6.7.
Ключевые слова (''Своб.индексиров.''): thermal expansion--magnetostriction--electrostriction
Аннотация: Electro- and magnetostriction mechanisms and temperature behavior of the length of bismuth-substituted neodymium iron garnet films on glass and gallium gadolinium garnet have been investigated. Electric- and magnetic-field and temperature dependences of the electro- and magnetostriction constants have been determined. It has been established that the magnetostriction constant changes its sign upon temperature variation. The experimental data are explained using a model of dipole glass with the magnetoelectric and magnetoelastic interaction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhachev A. L., Malakhovskii A. V., Nelson C. S., Gudim I. A., Temerov V. L.
Заглавие : Comparison of the absorption spectra of Nd3+ ions in the NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and Ho0.75Nd0.25Fe3(BO3)4 crystals
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P.113-121. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783421010200
Примечания : Cited References: 21. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: number 19-42-240003 “Influence of the local en-vironment on magneto-optical properties of f–f transitions in rare-earth aluminum and iron borates”
Аннотация: The polarized optical absorption spectra in the region of a series of the f–f transitions of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and NdFe3(BO3)4 crystals at 90 K have been compared. The spectral features related to the difference in the local environment of Nd3+ ions in these crystals have been established. In the region of the transition 4I9/2 → 4G5/2 + 2G7/2 of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4 crystal, the appearance of some absorption lines at the structural transition R32 → P3121 around ~200 K due to the local symmetry variation has been found. The intensity of these lines smoothly increases with a decrease in temperature from the transition point. The temperature dependence of the lattice parameters of the Ho0.75Nd0.25Fe3(BO3)4 crystal has been measured. It has been found that, at the transition temperature, the lattice parameter a changes stepwise, which is indicative of the occurrence of a first-order phase transition. The lattice parameter c changes smoothly.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golosovsky I. V., Vasilev A. I., Mukhin A. A., Ressouche E., Skumryev V., Urcelay-Olabarria I., Gudim I. A., Bezmaternykh L. N.
Заглавие : Complex magnetic order in the Nd(Tb)Fe3(BO3)4 multiferroic revealed by single-crystal neutron diffraction
Место публикации : Phys. Rev. B. - 2019. - Vol. 99, Is. 13. - Ст.134439. - ISSN 24699950 (ISSN) , DOI 10.1103/PhysRevB.99.134439
Примечания : Cited References: 33. - This work was supported by the Russian Grant No. RFBR 16-02-00058. A.A.M. acknowledges the financial support from the Russian Science Foundation (16-12-10531).
Аннотация: Magnetic structure of the substituted multiferroics-ferroborates Nd0.9Tb0.1Fe3(BO3)4 and Nd0.8Tb0.2Fe3(BO3)4 were determined in the framework of a self-consistent refinement of the single crystal neutron diffraction data. The small substitution of Nd for Tb leads to the reorientation of the main antiferromagnetic vector L from the basal plane towards the hexagonal axis. The reorientation takes place via an angular structure for which L does not coincide with the principal crystallographic directions and evolves with temperature due to competing magnetic anisotropies of Fe, Nd, and Tb subsystems. Our refinement at 2 K reveals the existence of distortions in the collinear antiferromagnetic Fe spin arrangement suggested before in other ferroborates. Therefore, besides the main antiferromagnetic vector L, the magnetic structure involves additional fine symmetrized combinations of spin components allowed by symmetry. They coexist with certain L components and could originate from the antisymmetric Dzyaloshinsky-Moriya Fe-Fe exchange interactions. At higher temperatures, the magnetic structure is described by the simple collinear model, where the L vector is deviated from the hexagonal plane. © 2019 American Physical Society.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuzmenko A. M., Mukhin A. A., Ivanov V.Yu., Bezmaternykh L. N.
Заглавие : Coupled R and Fe magnetic excitations in RFe 3(BO 3) 4 multiferroics
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.269-272. - ISBN 9783037854365, DOI 10.4028/www.scientific.net/SSP.190.269
Ключевые слова (''Своб.индексиров.''): magnetic resonance--rare-earth iron borates--terahertz spectroscopy--antiferromagnetics--coupled mode--exchange coupled--frequency ranges--g factors--iron borate--magnetic excitations--multiferroics--resonance mode--strong interaction--transmission spectrums--antiferromagnetism--electron transitions--gadolinium--ions--magnetic materials--magnetic permeability--magnetic resonance--terahertz spectroscopy--neodymium
Аннотация: Various resonance modes were observed in the transmission spectra of rare-earth iron borates RFe 3(BO 3) 4 (R = Nd 3+, Sm 3+, Gd 3+) at the frequency range 100-600 GHz, which were attributed to collective magnetic excitations in the exchange coupled Fe- and R-subsystems, i.e. antiferromagnetic (Fe) resonance and electron transitions in the R-ions. Strong interaction of the Fe and R oscillations was revealed and theoretically analyzed taking into account feature of the R-ion ground state. Intensities of the coupled modes (contributions to magnetic permeability) strongly depend on a difference of Fe and R ions g-factors that allows defining the sign of the latter. In particular, an appreciable intensity of exchange (Nd) modes in NdFe 3(BO 3) 4 is caused by g Nd?,|| < 0 whereas in GdFe 3(BO 3) 4 with gGd ? gFe ? 2 the exchange (Gd) modes were hided due to compensation of Fe and Gd contributions. In SmFe 3(BO 3) 4, despite a negligible Sm g-factor, the Sm modes were clear observed due to their excitation via coupling with the Fe-subsystem. В© (2012) Trans Tech Publications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smirnova E. S., Alekseeva O. A., Dudka A. P., Verin I. A., Artemov V. V., Lyubutina M. V., Gudim I. A., Frolov K. V., Lyubutin I. S.
Заглавие : Crystal structure of bismuth-containing NdFe3(BO3)4 in the temperature range 20–500 K
Коллективы : Russian Ministry of Science and Higher Education; Ministry of Science and Higher Education within the State assignment FSRC 'Crystallography and Photonics' RAS
Место публикации : Acta Crystallogr. B. - 2022. - Vol. 78, Pt. 1. - P.1-13. - ISSN 2052-5206(eISSN), DOI 10.1107/S205252062101180X
Примечания : Cited References: 44. - This work was performed using the equipment of the Shared Research Center FSRC `Crystallography and Photonics' RAS supported by the Russian Ministry of Science and Higher Education. This work was supported by the Ministry of Science and Higher Education within the State assignment FSRC `Crystallography and Photonics' RAS
Предметные рубрики: MAGNETIC PHASE-TRANSITIONS
UNIT-CELL PARAMETERS
DIFFRACTION
Аннотация: Neodymium iron borate NdFe3(BO3)4 is an intensively studied multiferroic with high electric polarization values controlled by a magnetic field. It is characterized by a large quadratic magnetoelectric effect, rigidity in the base plane and a rather strong piezoelectric effect. In this work, the atomic structure of (Nd0.91Bi0.09)Fe3(BO3)4 was studied by single-crystal X-ray diffraction in the temperature range 20–500 K (space group R32, Z = 3). The Bi atoms found in the composition partially substitute the Nd atoms in the 3a position; they entered the structure due to the growth conditions in the presence of Bi2Mo3O12. It was shown that in the temperature range 20–500 K there is no structural phase transition R32→P3121, which occurs in rare-earth iron borates (RE = Eu–Er, Y) with an effective rare-earth cation radius smaller than that of Nd. The temperature dependence of the unit-cell c parameter reveals a slight increase on cooling below 90 K, which is similar to the results obtained previously for iron borates of Gd, Y and Ho. The atomic distances (Nd,Bi)—O, (Nd,Bi)—B, (Nd,Bi)—Fe, Fe—O, Fe—B and Fe—Fe in the iron chains and between chains decrease steadily with decreasing temperature from 500 to 90 K, whereas the B1(3b)—O distance does not change and the average B2(9e)—O distance increases slightly. There is a uniform decrease in the atomic displacement parameters with decreasing temperature, with a more pronounced decrease for the Nd(3a) and O2(9e) atoms. The O2(9e) atoms are characterized by the maximum atomic displacement parameters and the most elongated atomic displacement ellipsoids. The characteristic Debye and Einstein temperatures, and the static component in the atomic displacements were determined for cations using multi-temperature diffraction data. It was shown that the Nd cations have the weakest bonds with the surrounding atoms and the B cations have the strongest.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Demidov A. A., Gudim, I. A., Eremin E. V.
Заглавие : Magnetic properties of Nd 0.6Dy 0.4Fe 3(BO 3) 4
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.261-264. - ISBN 9783037854365, DOI 10.4028/www.scientific.net/SSP.190.261
Ключевые слова (''Своб.индексиров.''): multiferroics--phase transitions--rare-earth ferroborates rfe 3(bo 3) 4--experimental data--magnetization curves--molecular field approximation--multiferroics--rare-earth ferroborates rfe--spin reorientation transitions--spin-flop transitions--substituted compounds--magnetic materials--magnetic properties--neodymium--phase transitions--dysprosium compounds
Аннотация: The magnetic properties of trigonal Nd 0.6Dy 0.4Fe 3(BO 3) 4 substituted compound with the competitive Nd-Fe and Dy-Fe exchange interactions have been investigated. It has been shown that in Nd 0.6Dy 0.4Fe 3(BO 3) 4a spontaneous spin-reorientation transition from an ease-axis state to an easy-plane occurs near 31 K. Anomalies of the magnetization curves are observed in a spin-flop transition induced by the magnetic field B||c. The calculations were performed using a molecularfield approximation and a crystal-field model for the rare-earth subsystem. Extensive experimental data on the magnetic properties of Nd 0.6Dy 0.4Fe 3(BO 3) 4have been interpreted and good agreement between theory and experiment has been achieved using the obtained theoretical dependences. В© (2012) Trans Tech Publications.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Gavrichkov V. A., Ovchinnikov S. G., Nekrasov I. A., Kokorina E. E., Pchelkina Z. V.
Заглавие : Dominance of many-body effects over the one-electron mechanism for band structure doping dependence in Nd2-xCexCuO4: the LDA + GTB approach
Разночтения заглавия :авие SCOPUS: Dominance of many-body effects over the one-electron mechanism for band structure doping dependence in Nd2-xCexCuO4: The LDA+GTB approach
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2007. - Vol. 19, Is. 48. - Ст.486203. - ISSN 0953-8984, DOI 10.1088/0953-8984/19/48/486203
Примечания : Cited References: 36
Предметные рубрики: NARROW ENERGY BANDS
HUBBARD-MODEL
SUPERCONDUCTORS
DENSITY
TEMPERATURE
ORBITALS
WAVE
Ключевые слова (''Своб.индексиров.''): antiferromagnetism--band structure--correlation methods--crystal structure--local density approximation--superconducting materials--electronic correlations--fermionic quasiparticles--neodymium compounds
Аннотация: In the present work we report band structure calculations for the high-temperature superconductor Nd2-xCexCuO4 in the regime of strong electronic correlations within an LDA + GTB method, which combines the local density approximation (LDA) and the generalized tight-binding method (GTB). The two mechanisms of band structure doping dependence were taken into account. Namely, the one-electron mechanism provided by the doping dependence of the crystal structure, and the many-body mechanism provided by the strong renormalization of the fermionic quasiparticles due to the large on-site Coulomb repulsion. We have shown that, in the antiferromagnetic and in the strongly correlated paramagnetic phases of the underdoped cuprates, the main contribution to the doping evolution of the band structure and Fermi surface comes from the many-body mechanism.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Subanakov A. K., Aleksandrovsky A. S., Bazarov B. G., Bazarova J. G., Dorzhieva S. G., Gavrilova T. A., Krylov A. S., Molokeev M. S., Oreshonkov A. S., Pugachev A. M., Tushinova Y. L., Yelisseyev A. P.
Заглавие : Exploration of structural, thermal, vibrational and spectroscopic properties of new noncentrosymmetric double borate Rb3NdB6O12
Место публикации : Adv. Powder Technol.: Elsevier, 2017. - Vol. 28, Is. 5. - P.1309-1315. - ISSN 09218831 (ISSN), DOI 10.1016/j.apt.2017.02.019
Примечания : Cited References: 42. - We are grateful to Guochun Zhang for the crystal structure data on K3YB6O12, and O. Tsydenova and A. Sarapulova for her consultations. This research was supported by SB RAS Program No.II.2P (No. 0356-2015-0412) and RSF (14-22-0143). The reported study was funded by RFBR according to the research projects 15-02-04950 and 15-52-53080, 16-32-00351, 16-52-48010 and 17-52-53031. Also, the work was supported by Act 211 Government of the Russian Federation, contract 02.A03.21.0011 and by the Ministry of Education and Science of the Russian Federation (4.1346.2017/PP).
Ключевые слова (''Своб.индексиров.''): rubidium neodymium borate--solid state reaction--rietveld refinement--dsc--raman scattering
Аннотация: New noncentrosymmetric rare earth borate Rb3NdB6O12 is found in the ternary system Rb2O–Nd2O3–B2O3. The Rb3NdB6O12 powder was fabricated by solid state synthesis at 1050 K for 72 h and the crystal structure was obtained by the Rietveld method. Rb3NdB6O12 crystallized in space group R32 with unit cell parameters a = 13.5236(4), c = 31.162(1) Å, Z = 3. From DSC measurements, the reversible phase transition (I type) in Rb3NdB6O12 is observed at 852–936 K. The 200 μm thick tablet is transparent over the spectral range of 0.3–6.5 μm and the band gap is found as Eg ∼ 6.29 eV. Nonlinear optical response of Rb3NdB6O12 tested via SHG is estimated to be higher than that of K3YB6O12. Blue shift of Nd luminescent lines is found in comparison with other borates. The vibrational parameters of Rb3NdB6O12 are evaluated by experimental methods.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ganzhenko I. M., Yakubaylik E. K.
Заглавие : Magnetite losses decrease at the Abagurskaya concentrating plant
Место публикации : Obogashch. Rud. - 2015. - Is. 1. - P.22-25. - ISSN 0202-3776
Примечания : Cited References: 7
Ключевые слова (''Своб.индексиров.''): magnetite--magnetic separator--neodymium-iron-boron--magnetic-field intensity--saturation magnetization, residual and in different fields--coercive force--specific magnetic susceptibility
Аннотация: Presently, owing to the wet magnetic concentration technology and equipment improvement, losses of magnetite iron in tailings were reduced close to 1 % at all iron ore processing facilities. This raises the question of magnetite losses limit value that may be reached on the basis of the available engineering and technical provision. The results of the investigations, performed with a view to estimate achievable level of magnetite losses at the Abagurskaya concentrating plant, are presented. As a result of the composition and magnetic properties investigations, carried out on samples of concentrate and classifiers overflow products, as well as final tailings in all processing operations, it was established, that losses of magnetite iron in tailings could be reduced to 0.5 %. With that, decrease by 0.15 % may be achieved by means of replacement of all barium-ferrite systems with the ones made of neodymium-iron-boron alloy, and by 0.30 %-through application of separators of the type PBR-P-90/250A in magnetite heavy-medium regeneration, as well as application of neodymium-iron-boron alloy magnets.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kaminskii A. A., Butashin A. V., Aleksandrov K. S., Bezmaternykh L. N., Temerov V. L., Kravtsov N. V., Firsov V. V., Seo D. T., Hommerich U., Temple D., Braud A.
Заглавие : Gd3Ga5O12:Nd3+ crystals for a continuous-wave diode-pumped laser operating in 4F3/2 4I11/2 and 4F3/2 4I13/2 channels
Место публикации : Crystallogr. Rep. - 2002. - Vol. 47, Is. 2. - P.308-312. - ISSN 1063-7745, DOI 10.1134/1.1466508
Примечания : Cited References: 15
Предметные рубрики: GALLIUM GARNET
EMISSION
Ключевые слова (''Своб.индексиров.''): gadolinium--gallium--neodymium--article--concentration response--crystal--pump--spectroscopy--x ray--x ray topography
Аннотация: Garnet crystals of the composition Gd3Ga5O12:Nd3+ (concentration series CNd = 1-10 at. %) were grown from flux. In terms of spectroscopy, these crystals, unlike those grown from melts, form a medium with a single activator center. For the first time, continuous-wave lasing was excited by diode pumping with the use of Gd3Ga5O12:Nd3+ crystals at the wavelengths ?3 = 1.3315 and ?4 = 1.3370 ?m of the 4F3/2 4I13/2 channel and also the simultaneous generation at two wavelengths, ?1 = 1.0621 and ?2 = 1.0600 ?m, of the 4F3/2 4I11/2 channel. В© 2002 MAIK "Nauka/Interperiodica".
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisova L. T., Molokeev M. S., Galiakhmetova N. A., Denisov V. M., Belousova N. V.
Заглавие : Heat capacity and thermodynamic properties of germanates CaR2Ge3O10 (R = Pr, Nd) in the region of 320–1000 K
Место публикации : Russ. J. Phys. Chem. A. - 2022. - Vol. 96, Is. 5. - P.913-917. - ISSN 00360244 (ISSN), DOI 10.1134/S0036024422050077
Примечания : Cited References: 30. - The authors are grateful to the Krasnoyarsk Regional Shared Resource Center of the Krasnoyarsk Science Center. This work was performed as part of a State Task for Siberian Federal University, project no. FSRZ-2020-0013
Аннотация: Sequential annealing of stoichiometric mixtures of CaCO3, Pr6O11(Nd2O3), and GeO2 in air at 1423–1473 K yields germanates CaPr2Ge3O10 and CaNd2Ge3O10. Their crystal structure is refined via X-ray diffraction. The high-temperature heat capacity (320–1000 K) is measured by means of differential scanning calorimetry. The thermodynamic properties of germanates are calculated using experimental dependences Cp = f(T).
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : LUKINYKH V. F., MYSLIVETS S. A., SLABKO V. V.
Заглавие : IMPULSE LASER SYSTEM ON GLASS WITH NEODYMIUM FOR THE STUDY OF NONLINEAR OPTICAL PHENOMENA IN GASES
Место публикации : Zhurnal Tek. Fiz.: MEZHDUNARODNAYA KNIGA, 1984. - Vol. 54, Is. 5. - P879-882. - ISSN 0044-4642
Примечания : Cited References: 7
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova E. A., Tristan N., Hess C., Klingeler R., Buchner B., Bezmaternykh L. N., Temerov V. L., Vasil'ev A. N.
Заглавие : Magnetic and thermal properties of single-crystal NdFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Magnetic and thermal properties of single-crystal NdFe3(BO 3)4
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 105, Is. 1. - P105-107. - ISSN 1063-7761, DOI 10.1134/S1063776107070229
Примечания : Cited References: 4
Ключевые слова (''Своб.индексиров.''): antiferromagnetism--magnetic field effects--magnetic properties--rare earths--single crystals--thermodynamic properties--antiferromagnetic transition--crystallographic axes--kramers doublet--neodymium ferroborate--neodymium compounds
Аннотация: The neodymium ferroborate NdFe3(BO3)(4) undergoes an antiferromagnetic transition at T-N = 30 K, which manifests itself as a lambda-type anomaly in the temperature dependence of the specific heat C and as inflection points in the temperature dependences of the magnetic susceptibility chi measured at various directions of an applied magnetic field with respect to the crystallographic axes of the sample. Magnetic ordering occurs only in the subsystem of Fe3+ stop ions, whereas the subsystem of Nd3+ stop ions remains polarized by the magnetic field of the iron subsystem. A change in the population of the levels of the ground Kramers doublet of neodymium ions manifests itself as Schottky-type anomalies in the C(T) and chi(T) dependences at low temperatures. At low temperatures, the magnetic properties of single-crystal NdFe3(BO3)(4) are substantially anisotropic, which is determined by the anisotropic contribution of the rare-earth subsystem to the magnetization. The experimental data obtained are used to propose a model for the magnetic structure of NdFe3(BO3)(4).
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chukalina E. P., Kuritsin D. Y., Popova M. N., Bezmaternykh L. N., Kharlamova S. A., Temerov V. L.
Заглавие : Magnetic ordering of NdFe3(BO3)(4) studied by infrared absorption spectroscopy
Разночтения заглавия :авие SCOPUS: Magnetic ordering of NdFe3(BO3)4 studied by infrared absorption spectroscopy
Место публикации : Phys. Lett. A. - 2004. - Vol. 322, Is. 3-4. - P.239-243. - ISSN 0375-9601, DOI 10.1016/j.physleta.2003.12.062
Примечания : Cited References: 8
Предметные рубрики: CRYSTALS
Ключевые слова (''Своб.индексиров.''): ferroborates--fourier-transform spectroscopy--magnetic ordering--ferroborates--fourier-transform spectroscopy--magnetic ordering--iron--neodymium--absorption spectroscopy--article--electronics--infrared spectroscopy--magnetism--molecular interaction--molecular physics--temperature
Аннотация: We report the first measurements of the optical spectra of NdFe3(BO3)(4), a promising material for optoelectronics. Exchange splitting of Nd3+ spectral lines due to magnetic interactions in a magnetically ordered state was observed. The temperature dependences of the exchange splitting and of the linewidth point to the temperature T-c 33 +/- 1K of the magnetic ordering in both iron and neodymium. magnetic subsystems. 2004 Elsevier B.V. All rights reserved.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zvyagina G., Zhekov K., Zvyagin A., Bilych I., Gudim I. A., Temerov V. L., Volkov N. V.
Заглавие : Magnetoelastic effects in the neodymium ferroborate
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2011): Book of abstracts. - 2011. - Ст.23PO-K-27. - P.496-497
Примечания : Библиогр.: 3
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Osseni S. А., Andreev P. O., Polkovnikov A. A., Zakharov B. A., Aleksandrovsky A. S., Abulkhaev M. U., Volkova S. S., Kamaev D. N., Kovenskiy I. M., Nesterova N. V., Kudomanov M. V., Andreev O. V.
Заглавие : Properties of oxysulfide phases and phase diagram of the Nd2S3–Nd2O3 system
Место публикации : J. Solid State Chem. - 2022. - Vol. 314. - Ст.123438. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2022.123438
Примечания : Cited References: 51. - This research was funded by the Tyumen Oblast Government , as part of the West-Siberian Interregional Science and Education Center's project No. 89-DON (3)
Аннотация: We have determined the thermal characteristics and optical properties of the sulfide and oxysulfide phases in the Nd2S3 - Nd2O3 system. A congruent melting peak at temperature 1801 ± 4.9 °C with ΔH = 65.2 ± 6.7 kJ/mol was detected for the Nd2S3 compound by the DSC method. The characteristics of the α-Nd2S3 → γ-Nd2S3 polymorphic transition are t = 1183 ± 1.8°С, and ΔH = 7.5 ± 0.3 kJ/mol. The γ-Nd2S3 phase obtained upon cooling during annealing at 800 °C is retained for up to 30 h, and then the γ-Nd2S3 → α-Nd2S3 transition occurs within 20 h. The microhardness of the phases is: α-Nd2S3 H = 451 ± 4 HV; γ-Nd2S3 H = 531 ± 4 HV. It was found by the TG method that the Nd10S14O phase thermally dissociates at temperatures above 1400 °C. The mass loss is 0.5 mass % at 1580 °C and 1.0 mass % at 1620 °C, but the samples remain single-phase ones after cooling. However, two impurity phases γ-Nd2S3-X and Nd2O2S appear in the Nd10S14O samples treated at temperatures above 1620 ± 20 °C. For samples of the Nd10S14O phase annealed in an argon atmosphere at temperatures of 1050, 1400, 1580 °C, a regular decrease in the unit cell parameters and optical band gap was recorded: 1050 °C a = 15.06291(28), c = 19.97864(35), Eg = 2, 63 eV, 1400 °C a = 15.04779(36), c = 19.97160(44), Eg = 2.64 eV; 1580 °C a = 15.03532(48), c = 19.94984(60), Eg = 2.51 eV. The microhardness of Nd10S14O is H = 549 ± 10 HV. The Nd2O2S phase has H = 593 ± 4 HV, Eg = 4.28 eV. The phase diagram of the Nd2S3 - Nd2O3 system from 1000 °C to the melt was constructed. The Nd2O2S phase melts congruently at 2050 ± 30 °C. Eutectics with coordinates 23 mol. % Nd2O3 (0.3484 Nd10S14O + 0.6516 Nd2O2S), t = 1553 ± 1.8°С; ΔH = 187 ± 19 J/g; 82 mol. % Nd2O3; (0.54 Nd2O2S + 0.46 Nd2O3), t = 1970 ± 30°С were obtained. The liquidus of the Nd2S3 - Nd2O3 system was built according to DSC data and calculated using the Redlich-Kister equation. The melting enthalpy of Nd2O2S ΔH = 67 kJ/mol was calculated using the Schroeder equation.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fischer P., Pomjakushin V., Sheptyakov D., Keller L., Janoschek M., Roessli B., Schefer J., Petrakovskii G. A., Bezmaternykh L. N., Temerov V. L., Velikanov D. A.
Заглавие : Simultaneous antiferromagnetic Fe3+ and Nd3+ ordering in NdFe3((BO3)-B-11)(4)
Разночтения заглавия :авие SCOPUS: Simultaneous antiferromagnetic Fe3+ and Nd3+ ordering in NdFe3(11BO3)4
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2006. - Vol. 18, Is. 34. - P.7975-7989. - ISSN 0953-8984, DOI 10.1088/0953-8984/18/34/010
Примечания : Cited References: 20
Предметные рубрики: PHASE-TRANSITION
DIFFRACTION
CRYSTALS
GDFE3(BO3)(4)
SINQ
Ключевые слова (''Своб.индексиров.''): iron compounds--magnetic moments--magnetization--neodymium compounds--neutron diffraction--vectors--crystal-field effects--free ion moment--specific heat measurements--symmetry analysis--antiferromagnetic materials
Аннотация: By means of magnetic susceptibility and specific heat measurements, x-ray and unpolarized neutron diffraction investigations on powder and single-crystal samples, simultaneous long-range antiferromagnetic Fe and Nd ordering in NdFe3((BO3)-B-11)(4) with R32 chemical structure has been found at temperatures below T-N = 30.5(5) K down to 1.6 K. At temperatures down to 19 K the propagation vector is k(hex) = [0, 0, 3/2] and becomes slightly incommensurate at lower temperatures. Combined with symmetry analysis, best powder neutron profile fits are obtained with magnetic spiral configurations with the magnetic moments oriented parallel to the hexagonal basal plane according to the irreducible representations tau(3) in the commensurate case. This is in agreement with the easy directions of magnetization perpendicular to the c-axis as determined by magnetic susceptibility measurements. At 1.6 K the magnetic Fe moment amounts to 4.9 mu(B) B close to the free ion moment of Fe3+. The magnetic Nd3+ moment saturates presumably due to crystal-field effects at 2.7 mu(B).
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