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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Basova S. A., Molokeev M. S., Oreshonkov A. S., Zhernakov M. A., Khritokhin N. A., Aleksandrovsky A. S., Krylov A. S., Sal’nikova E. I., Azarapin N. O., Shelpakova N. A., Muller-Buschbaum K., Denisenko Yu. G.
Заглавие : Thermochemistry, structure, and optical properties of a new β-La2(SO4)3 polymorphic modification
Колич.характеристики :14 с
Место публикации : Inorganics. - 2023. - Vol. 11, Is. 11. - Ст.434. - ISSN 23046740 (eISSN), DOI 10.3390/inorganics11110434
Примечания : Cited References: 58. - The work was partly carried out within the framework of the Strategic Academic Leadership Program “Priority-2030” for the Kazan Federal University and the state assignment of the Kirensky Institute of PhysicsWe acknowledge Lisa-Marie Wagner (JLU Giessen) for help with X-ray powder diffractometry, and Svetlana Volkova and Irina Palamarchuk (UTMN) for help with IR- and UV-spectrometry. The use of equipment provided by the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” is acknowledged
Аннотация: A new polymorphic modification of lanthanum sulfate was obtained by thermal dehydration of the respective nonahydrate. According to powder X-ray diffraction, it was established that β-La2(SO4)3 crystallized in the C2/c space group of the monoclinic system with the KTh2(PO4)3 structure type (a = 17.6923(9), b = 6.9102(4), c = 8.3990(5) Å, β = 100.321(3)°, and V = 1010.22(9) Å3). Temperature dependency studies of the unit cell parameters indicated almost zero expansion along the a direction in the temperature range of 300–450 K. Presumably, this occurred due to stretching of the [LaO9]n chains along the c direction, which occurred without a significant alteration in the layer thickness over the a direction. A systematic study of the formation and destruction processes of the lanthanum sulfates under heating was carried out. In particular, the decisive impact of the chemical composition and formation energy of compounds on the thermodynamic and kinetic parameters of the processes was established. DFT calculations showed β-La2(SO4)3 to be a dielectric material with a bandgap of more than 6.4 eV. The processing of β-La2(SO4)3 with the Kubelka–Munk function exhibited low values below 6.4 eV, which indicated a fundamental absorption edge above this energy that was consistent with LDA calculations. The Raman and infrared measurements of β-La2(SO4)3 were in accordance with the calculated spectra, indicating that the obtained crystal parameters represented a reliable structure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Bezmaternykh L. N., Eremin E. V., Nazarenko I. I., Volkov N. V., Kartashev A. V., Moshkina E. M.
Заглавие : The superexchange interactions and magnetic ordering in low-dimentional ludwigite Ni5GeB2O10
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 401. - P.217-222. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2015.10.024
Примечания : Cited References: 23. - This study was supported by Russian Foundation for Basic Research (RFFI Siberia No. 15-42-04186). We thank S. Popkov, G. Yurkin for help on the magnetic measurements and M.S. Molokeev for help on the x-ray diffraction
Предметные рубрики: DIELECTRICS
EXCHANGE
CATION
Ключевые слова (''Своб.индексиров.''): ludwigites--magnetic order--heat capacity--exchange interactions--ferrimagnetic
Аннотация: The ludwigite Ni5Ge(BO5)2 belongs to a family of oxyborates which have low-dimensional subunits in the form of three-leg ladders unit structure. This material was studied by magnetic and thermodynamic measurements. Ni5Ge(BO5)2 does not show full long-range magnetic order, but one goes into a partial ordering or spin-glass state at 87 K. The superexchange interactions were calculated in the framework of a simple indirect coupling model. Different models of magnetic structure of Ni5Ge(BO5)2 and its unique magnetic behaviour was discussed. © 2015 Elsevier B.V.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bayukov O. A., Savitskii A. F.
Заглавие : The prognostication possibility of some magnetic-properties for dielectrics on the basis of covalency parameters of ligand cation bonds
Место публикации : Phys. Status Solidi B. - 1989. - Vol. 155, Is. 1. - P.249-255. - ISSN 0370-1972, DOI 10.1002/pssb.2221550125
Примечания : Cited References: 27
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Mironov V. L., Karavaysky A. Yu., Molostov I. P., Lukin Y. I., Kosolapova L. G.
Заглавие : Temperature and texture dependent spectroscopic dielectric model for frozen mineral soils at 0.1-15GHz
Коллективы : Progress in Electromagnetics Research Symposium , Russian Science Foundation [14-17-00656]
Место публикации : Progr. Electromag. Res. Symp. (PIERS): Proceedings: IEEE, 2016. - P.4754-4754. - , DOI 10.1109/PIERS.2016.7735742
Примечания : Cited References:2. - The work was supported by the Russian Science Foundation (grant No. 14-17-00656).
Ключевые слова (''Своб.индексиров.''): soil--dielectrics--temperature measurement--minerals--temperature dependence--dielectric measurement--frequency measurement
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vtyurin A. N., Krylov A. S., Krylova S. N., Oreshonkov A. S., Wei X., Feng Y., Xu R., Zhao T.
Заглавие : Soft modes condensation in Raman spectra of (Pb-La)(Zr-Sn-Ti)O3 ceramics
Место публикации : J. Adv. Dielectr. - 2019. - Vol. 9, Is. 3. - Ст.1950024. - ISSN 2010135X (ISSN), DOI 10.1142/S2010135X19500243
Примечания : Cited References: 11
Аннотация: Low frequency Raman spectra of (Pb0.97La0.02)(Zr0.864Sn0.04Ti0.096)O3 ceramic samples have been studied near cubic to antiferroelectric phase transition at about 200 °C. A set of low frequency soft modes were observed restoring below the transition point, in addition to the known one above 100cm-1. These modes show strong damping anomalies at the transition point that supposes considerable intermode interactions via dampings. © 2019 The Author(s).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : BAYUKOV O. A., SAVITSKII A. F.
Заглавие : PREDICTION OF MAGNETIC-PROPERTIES OF DIELECTRICS IS POSSIBLE
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1994. - Vol. 36, Is. 7. - P1923-1938. - ISSN 0367-3294
Примечания : Cited References: 54
Предметные рубрики: EXCHANGE INTERACTIONS
METAL-IONS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Sofronova S. N., Gudim I. A., Krylova S. N., Kumar R., Vtyurin A. N.
Заглавие : Manifestation of magnetoelastic interactions in Raman spectra of HoxNd1-хFe3(BO3)4 crystals
Коллективы : International Workshop on Advanced Dielectric Materials and Their Applications
Место публикации : J. Adv. Dielectr. - 2018. - Vol. 08, Is. 02. - Ст.1850011. - ISSN 2010135X (ISSN), DOI 10.1142/S2010135X1850011X
Примечания : Cited References: 32
Ключевые слова (''Своб.индексиров.''): multiferroic--magnetoelastic interaction--raman spectra--phase transition--magnetic ordering
Аннотация: Raman spectra of Ho1-xNdxFe(BO3)4 (x=1, 0.75, 0.5, 0.25) have been studied in temperature range 10-400K. Two compositions (x=1, x=0.75) demonstrate structural phase transition with soft mode restoration. The addition of Nd atoms increases interatomic spacing and decreases the temperature of structural phase transition. The solid solutions (x=0.75, 0.5, 0.25) demonstrate the emergence of the peaks corresponding to magnetoelastic interaction below Neel temperature. The order parameter of the magnetic phase transition has been determined. The equal concentrations of holmium and neodymium atoms prevent magnon soft modes condensation caused by exchange interactions in Fe-O-Fe chains are observed. Calculations confirm the data obtained in the experiment.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Sofronova S. N., Veligzhanin A., Molokeev M. S., Nazarenko I. I., Eremin E. V., Bezmaternykh L. N.
Заглавие : Magnetism and structure of Ni2MnBO5 ludwigite
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 402. - P.69-75. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2015.11.033
Примечания : Cited References: 23. - The authors are grateful to Professor N.V. Volkov and Professor A.N. Vasiliev for valuable discussions. This work was supported by Russian Foundation for Basic Research (grants No. 16-02-00055, 16-32-00318)
Предметные рубрики: CRYSTAL-STRUCTURE
DIELECTRICS
IFEFFIT
Mn
Ключевые слова (''Своб.индексиров.''): ludwigites--crystal structure--antiferromagnetic--indirect coupling model
Аннотация: Single crystals of ludwigite Ni2MnBO5 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 is differ from the content of the initial Mn2O3–NiO components of flux. Magnetic susceptibility measurements and the calculations of the exchange integrals in frameworks of indirect coupling model revealed strong antiferromagnetic interactions and appearance of magnetic ordering phase at the temperature T=85 K. The hypothesis of the existence of several magnetic subsystems was supposed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shinkorenko A. S., Zinenko V. I., Pavlovskii M. S.
Заглавие : Magnetic, electronic, and optical properties of the tetraborates NiB4O7 and CoB4O7 in three structural modifications
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-32-00919 mol_a]
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 3. - P.468-476. - ISSN 1063-7834, DOI 10.1134/S1063783421030173. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 22. - This study was supported by the Russian Foundation for Basic Research, project no. 18-32-00919 mol_a
Аннотация: The physical properties of the NiB4O7 and CoB4O7 tetraborate compounds in three structural modifications with the sp. gr. Pbca, Cmcm, and P6522 have been calculated using the density functional theory in the VASP software package. The pressure dependences of the enthalpy of the compounds in the investigated structural modifications have been calculated. The calculated electron densities of states and band structures showed that the compounds under study in all the considered modifications are dielectrics with a band gap of 3–4 eV. The calculation of the magnetic exchange constants in the Heisenberg model have shown qualitative agreement with the experiment.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bezmaternykh L. N., Sofronova S. N., Volkov N. V., Eremin E. V., Bayukov O. A., Nazarenko I. I., Velikanov D. A.
Заглавие : Magnetic properties of Ni3B2O6 and Co3B2O6 single crystals
Место публикации : Phys. Status Solidi B. - 2012. - Vol. 249, Is. 8. - P.1628-1633. - ISSN 0370-1972, DOI 10.1002/pssb.201147518
Примечания : Cited References: 12. - This study was supported by the Siberian Branch of the Russian Academy of Sciences, Integration project no. 101.
Предметные рубрики: DIELECTRICS
Ключевые слова (''Своб.индексиров.''): antiferromagnets--crystal growth--magnetics structure--ni3b2o6 and co3b2o6 single crystals
Аннотация: Orthorhombic Me3B2O6 (Me = Co, Ni) single crystals of the kotoite family are grown from the fluxes based on a mixture of bismuth trimolybdate and sodium oxide upon spontaneous nucleation. The field and temperature dependences of magnetization of the single crystals with the magnetic field oriented along the principal crystallographic directions are obtained. Unlike Ni3B2O6, Co3B2O6 exhibits strong anisotropy of the magnetic properties. At the temperature T = 10 K, the magnetization curves of Co3B2O6 reveal an anomaly attributed to the spin-reorientation transition. Strong anisotropy of the magnetic properties of Co3B2O6 is also confirmed by the calculation of the exchange interactions within a simple indirect coupling model.
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