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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A., Sokolov V. V., Velikanov D. A., Vorotynov A. M., Bovina A. F., Amirov A. A., Aliev A. M., Khanov L. N., Patrin G. S.
Заглавие : New magnetic materials Cu x Mn1 − x S with a metal-insulator transition
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 3. - P.531–536. - ISSN 1063-7834, DOI 10.1134/S106378341203002X
Примечания : Cited References: 9
Предметные рубрики: Alpha-MnS
Manganese
Аннотация: This paper reports on first results of the synthesis and study of the thermal, structural, electrical, resonance, and magnetic properties of new sulfide materials Mex Mn1 – S (Me = Cu, 0 ˂ x ˂ 0.2) synthesized based on manganese monosulfide. The materials have a NaCl cubic structure at 300 K and undergo a con centration metal–insulator transition with increasing degree of substitution and with varying temperature. The magnetic transition occurs in the region of the heat capacity anomaly. The Néel temperature is slightly dependent on the copper concentration. The samples with a high copper content exhibit metallic conduction at T ˂ 260 K and semiconductor conduction at T ˃ 260 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu.V., Ivanova N. B., Kazak N. V., Platunov M. S., Bezmaternykh L. N., Velikanov D. A., Vasiliev A. D., Ovchinnikov S. G., Yurkin G. Yu.
Заглавие : Crystal structure and magnetic properties of Mn substituted ludwigite Co3O2BO3
Место публикации : J. Magn. Magn. Mater.: Elsevier Science BV, 2012. - Vol. 324, Is. 6. - P.923-927. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2011.07.044
Примечания : Cited References: 15. - The study was supported by the Russian Foundation for Basic Research (Project no. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (Project no. MK-5632.2010.2), the Physical Division of the Russian Academy of Science, the program "Strongly Correlated Electrons", Project 2.3.1.
Предметные рубрики: BOND VALENT SUMS
COORDINATION CHEMISTRY
OXIDATION -STATE
O BONDS
COMPLEXES
MANGANESE
COBALT
Ключевые слова (''Своб.индексиров.''): transition metal oxyborate--distinct crystallographic position--spin glass magnetic ordering
Аннотация: The needle shape single crystals Co3−x MnxO2BO3 with ludwigite structure have been prepared. According to the X-ray diffraction data the preferable character of distinct crystallographic positions occupation by Mn ions is established. Magnetization field and temperature dependencies are measured. Paramagnetic Curie temperature value Θ=−100 K points out the predominance of antiferromagnetic interactions. Spin-glass magnetic ordering takes the onset at TN=41 K. The crystallographic and magnetic properties of Co3O2BO3:Mn are compared with the same for the isostructural analogs Co3O2BO3 and CoO2BO3:Fe.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O. B., Gorev M. V., Vasil'ev A. D., Demidenko O. F., Makovetskii G. I., Yanushkevich K. I.
Заглавие : Synthesis, structure, and magnetic properties of anion-substituted manganese chalcogenides
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 7. - P.1374-1379. - ISSN 1063-7834
Примечания : Cited References: 14. - This study was supported by the Russian Foundation for Basic Research (project nos. 12-02-00125_a, 09-02-92001-NNS_a, 11-02-98018 r_sibir'_a, and 12-02-93001 V'et_a), the Belarusian Republican Foundation for Fundamental Research-Russian Foundation for Basic Research (joint project RFBR-BRFFR no. 12-02-90004), the Belarusian Republican Foundation for Fundamental Research (project no. F08R-037), and the Ministry of Education and Science of the Russian Federation within the framework of the Analytical Department Targeted Program "Development of the Scientific Potential of the Higher School" (state contract no. 2.1.1/11763).
Предметные рубрики: Solid-Solutions
MnSe
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makovetskii G., Demidenko O. F., Galyas A., Yanushkevich K., Aplesnin S. S., Romanova O. B., Ryabinkina L. I.
Заглавие : Magnetic and thermoelectric properties of the Mn1-X Ni (X) S solid solutions
Место публикации : J. Korean Phys. Soc. - 2013. - Vol. 62, Is. 12. - P.2059-2062. - ISSN 0374-4884, DOI 10.3938/jkps.62.2059
Примечания : Cited References: 9. - This study was supported by the Russian Foundation for Basic Research project No. 09-02-92001-NNS_a; No.12-02-90004 Bel_a; No. 12-02-00125_a; No. 11-02-98018 r_sibir_a, F12R-060
Предметные рубрики: NICKEL SULPHIDE
TRANSITION
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--semiconductor conductivity--manganese sulphides
Аннотация: The new sulphide Mn1-X Ni (X) S (0X a parts per thousand currency sign 0.1) solid solutions are synthesized. The structural, magnetic, electric and thermoelectric properties of the obtained materials have been studied. The X-ray diffraction analysis has shown that the synthesized Mn1-X Ni (X) S samples have a NaCl-type FCC lattice. The Mn1-X Ni (X) S samples are antiferromagnets with the Neel temperature (T (N) T (N) . The conductivity type change from the hole to the electronic at X 0.05 is revealed on the basis of the thermoelectric power measurements. The resistivity and thermopower behaviors are explained in terms of the impurity subband formation into MnS electron excitation gap.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Bulavchenko O. A., Dubrovskii A. A., Tsybulya S. V., Cherepanova S. V., Gerasimov E. Y., Shaikhutdinov K. A.
Заглавие : Features of the structure, microstructure, and magnetic properties of manganese-aluminum spinels obtained in various thermal treatment conditions
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2013. - Vol. 55, Is. 7. - P.1401-1406. - ISSN 1063-7834, DOI 10.1134/S1063783413070056
Примечания : Cited References: 18. - This study was supported by the Russian Foundation for Basic Research (project no. 12-03-90839-mol_rf_nr) and the Ministry of Education and Science of the Russian Federation (agreement no. 8429).
Предметные рубрики: A-SITE SPINELS
CATALYSTS
OXIDE
MN3O4
Аннотация: The structural, microstructural, and magnetic properties of aluminum-manganese oxide in the ratio Mn: Al = 1: 1 in the well-crystallized and nanoheterogeneous states have been investigated. This oxide is obtained under various thermal treatment conditions and at different partial pressures of oxygen. The composition and cation distribution of the manganese and aluminum ions in spinel sites are determined. It is shown that the studied compound is a ferrimagnet with the Curie point T (C) a parts per thousand 26 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Antonova A. B., Chudin O. S., Vasiliev A. D., Rubaylo A. I., Verpekin V. V., Sokolenko W. A., Pavlenko N. I., Semeikin O. V.
Заглавие : Chemistry of vinylidene complexes. XX. Intramolecular carbonylation of vinylidene on the MnFe center: Spectroscopic and structural study. X-ray structure of the new trimethylenemethane type MnFe complex
Место публикации : J. Organomet. Chem.: Elsevier, 2011. - Vol. 696, Is. 4. - P.963-970. - ISSN 0022-328X, DOI 10.1016/j.jorganchem.2010.10.035
Примечания : Cited References: 52. - This work was partially supported by the Presidium of the Russian Academy of Sciences (Program for Basic Research, Project No. 7.18) and Russian Foundation for Basic Research (Grant No. 09-03-90745-mob_st). Authors are grateful to Prof. N.A. Ustynyuk for useful discussions, Dr. E.A. Shor and Dr. A.M. Shor for giving the data of quantum chemical study.
Предметные рубрики: MOLECULAR-STRUCTURE
ORGANOMETALLIC CHEMISTRY
TRICARBONYL COMPLEXES
UNSATURATED CARBENES
METAL VINYLIDENES
TRANSITION-METALS
ORGANIC-SYNTHESIS
CRYSTAL-STRUCTURE
IRON TRICARBONYL
MANGANESE
Ключевые слова (''Своб.индексиров.''): manganese--iron--carbonyl complexes--heteronuclear vinylidene complexes--intramolecular vinylidene carbonylation--trimethylenemethane complexes
Аннотация: Reactions of Fe-2(CO)(9) with Cp(CO)(2)Mn=C=CHPh (1) and Cp(CO)(PPh3)Mn=C=CHPh (3) gave the heterometallic trimethylenemethane complexes eta(4)-{C[Mn(CO)(2)Cp](CO)CHPh}Fe(CO)(3) (2) and eta(4)-{C[Mn(CO)(PPh3)Cp](CO)CHPh}Fe(CO)(3) (4), respectively. The formation of the benzylideneketene [PhHC=C=C=O] fragment included in complexes 2 and 4 occurs via intramolecular coupling of the carbonyl and vinylidene ligands. The structures of 3 and 4 were determined by single crystal XRD methods. The influence of the nature of the L ligands at the Mn atom on the structural and spectroscopic characteristics of eta(4)-{C[Mn(CO)(L)Cp](CO)CHPh}Fe(CO)(3) (L = CO (2), PPh3 (4)) is considered. According to the VT H-1 and C-13 NMR spectra, complex 2 reversibly transforms in solution into mu-eta(1):eta(1)-vinylidene isomer Cp(CO)(2)MnFe(mu-C=CHPh)(CO)(4) (2a), whereas complex 4 containing the PPh3 ligand is not able to a similar transformation. (C) 2010 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Балаев, Дмитрий Александрович, Булавченко О. А., Дубровский, Андрей Александрович, Цыбуля С. В., Черепанова С. В., Герасимов Е. Ю., Шайхутдинов, Кирилл Александрович
Заглавие : Особенности структуры, микроструктуры и магнитных свойств марганец-алюминиевых шпинелей, полученных при различных условиях термообработки
Место публикации : Физ. тверд. тела. - 2013. - Т. 55, Вып. 7. - С. 1304-1309
Аннотация: Исследованы структурные, микроструктурные и магнитные характеристики алюмомарганцевого оксида в соотношении Mn : Al = 1: 1 в хорошо окристаллизованном и наногетерогенном состояниях, получаемого при различных условиях температурной обработки и разном парциальном давлении кислорода. Определены состав и катионное распределение ионов марганца и алюминия в позициях шпинели. Показано, что исследованное соединение является ферримагнетиком с точкой Кюри TC~ 26 K. Работа выполнена при частичной поддержке гранта РФФИ N 12-03-90839-мол\_рф\_нр, программы Министерства образования и науки РФ (соглашение N 8429).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O., Gorev M. V., Velikanov D. A., Gamzatov A. G., Aliev A. M.
Заглавие : Magnetic and thermophysical properties of GdxMn1-xS solid solutions
Место публикации : J. Phys.: Condens. Matter. - 2013. - Vol. 25, Is. 2. - Ст.025802. - P. - ISSN 0953-8984, DOI 10.1088/0953-8984/25/2/025802
Ключевые слова (''Своб.индексиров.''): antiferromagnetic orders--band state--face-centered cubic lattices--magnetic phase transitions--paramagnetic phase--temperature dependence--antiferromagnetism--electron transitions--gadolinium--manganese--paramagnetism--sodium chloride--specific heat--organic polymers
Аннотация: The structural, magnetic, and thermophysical properties of cation-substituted sulfides GdXMn1-XS (0.04 ? X ? 0.25) with the NaCl-type face-centered cubic lattice have been investigated. The range of existence of long-range antiferromagnetic order has been established. The anomalies observed in the temperature dependence of the specific heat correspond to the temperatures of the magnetic phase transition. The anomaly in the specific heat caused by electron transitions between the 4f levels and d band states has been observed. It has been found that the coefficient of thermal expansion decreases with increasing concentration of substituents in the magnetically ordered region and remains nearly invariable in the paramagnetic phase. В© 2013 IOP Publishing Ltd.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Velikanov D. A., Petrakovskaja E. A., Artemenko A., Curely J., Kliava J., Zaikovskiy V. I., Stepanov S.
Заглавие : Magnetic properties and morphology of manganese ferrite nanoparticles in glasses
Коллективы : Baltic Conference on Silicate Materials
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2011. - Vol. 25, Is. 1. - Ст.012017. - , DOI 10.1088/1757-899X/25/1/012017
Ключевые слова (''Своб.индексиров.''): average diameter--borate glass--co-doped--electron magnetic resonance--magnetic and magneto-optical properties--magnetic behaviour--magnetic circular dichroisms--magnetic nanoparticles--magnetically ordered material--manganese ferrite nanoparticles--manganese ferrites--morphological characteristic--paramagnetic ions--resonance field--size and shape--static magnetization--temperature dependence--temperature dependent--variable temperature--visible and near infrared--alumina--dichroism--ferrite--glass--iron oxides--magnetic properties--magnetic resonance--magnetocrystalline anisotropy--manganese--manganese oxide--nanoparticles--paramagnetism--silicates--spectroscopy--nanomagnetics
Аннотация: Static magnetization (SM), magnetic circular dichroism (MCD) and electron magnetic resonance (EMR) studies are reported of borate glasses 22.5 K 2O-22.5 Al 2O 3-55 B 2O 3 co-doped with iron and manganese oxides. In as-prepared glasses the paramagnetic ions usually are in diluted state; however, if the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles are found already in as-prepared glass. After additional thermal treatment all glasses show magnetic behaviour, MCD and EMR due to the presence of magnetic nanoparticles with characteristics close to those of manganese ferrite. By computer simulating the EMR spectra at variable temperatures, their morphological characteristics are deduced: relatively broad size and shape distribution with average diameter of ca. 3-4 nm. The characteristic temperature-dependent shift of the apparent resonance field is explained by a strong temperature dependence of the magnetocrystalline anisotropy in the nanoparticles. The potassium-alumina-borate glasses containing magnetic nanoparticles represent a novel class of materials: "transparent magnets". Indeed, they remain transparent in a part of visible and near infrared spectral range while showing magnetic and magneto-optical properties characteristic of magnetically ordered materials.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov E. A., Kotlyarskii M. M., Edelman I. S.
Заглавие : Temperature and field dependence of exciton-magnon absorption of NaMnCl//3.
Место публикации : Physica Status Solidi B - Basic Research. - 1985. - Vol. 132, Is. 2. - P.465-470. - ISSN 0370-1972
Ключевые слова (''Своб.индексиров.''): band structure--light - absorption--sodium compounds - optical properties--exciton-magnon absorption--sodium manganese chloride--magnetic materials
Аннотация: The behaviour of the optical absorption bands of NaMnCl//3 is experimentally studied in the region of the **6A//1//g to **4A//1//g, **4E//g(**4G) transition of the Mn**2** plus ion in the temperature range 1. 8 to 20 K and in magnetic fields up to 20 T. Exciton and its 'hot' magnon sidebands are observed in the spectrum. The anomalous temperature dependence of the exciton-magnon bands intensity is explained by participation of magnons with wave vector K does not equal 0 in absorption. The low energy exciton-magnon band is supposed to be due to simultaneous creation of an exciton and annihilation of three thermally created magnons.
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