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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Beznosikov B. V., Aleksandrov K. S.
Заглавие : Crystal chemistry and structure of expected compounds A2BX4. II. Oxides, selenides, and sulfides 061A2B6+X4 2- and 080A2 2+B4+X4 2-.
Место публикации : Sov. Phys.: Crystallogr. - 1985. - Vol. 30, Is. 5. - P.533-535; \b Crystallography Reports; \b Kristallografiya
Аннотация: Predictions of A2BX4 compounds for compositions 071A2 +B6+X4 2- with type structures of K2MgF4, beta -K2SO4, spinel, olivine, thenardite, phenacite, Sr2PbO4, and Pb3O4 are presented. K2MgF4 type structures are known and probable only in oxides and sulphides with hexavalent uranium because their formation is limited by the size of the hexavalent B cation. Structures of the beta -K2SO4 type are stable in compounds with large A cations. Among the sulphides with 076A2 +B6+X4 2-, the spinel crystal structure is as yet unknown, but is most probable in compounds with A+ = Li, Na, Ag, and with B6+ = Mo, W, and U. The olivine type structure is known only in Ag2CrO4, and no new compounds with this structure are expected to be found. A phenacite structure is probable only in three new oxides and in some sulphides with Li as A+. A thenardite type structure is probable in oxides with B6+ = Fe and Mn, but sulphides are unlikely. For 076A2 2+B4+X4 2- compounds with large A2+ ions and B4+ ions with radii from 0.57 A to RB 0.48RA + 0.11, a K2MgF4 structure would exist. For even larger A ions, the Sr2PbO4 structure would exist. In oxides with cations A2+ = Pb and Sn, compounds with Pb3O4 type structures are probable.-D.F.P.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Романова, Оксана Борисовна, Харьков, Анатолий Михайлович, Ситников, Максим Николаевич, Кретинин В. В.
Заглавие : Переход металл-диэлектрик в катион-замещенных соединениях ReхMn1-xS (Re = Gd, Sm, Ho)
Место публикации : Вестник СибГАУ. - Красноярск: СибГАУ, 2015. - Т. 16, № 2. - С. 478-484. - ISSN 1816-9724 (Шифр В22/2015/16/2)
Примечания : Библиогр.: 38. - Работа выполнена при финансовой поддержке РФФИ № 15-42-04099 р_Cибирь_а и государственного задания № 114090470016.
Ключевые слова (''Своб.индексиров.''): сульфиды редкоземельных элементов--проводимость--переход металл-диэлектрик--термоэдс--sulfides of rare-earth elements--conductivity--transition metal-insulator--thermoelectric power
Аннотация: Представлены результаты исследования транспортных свойств катион-замещенных сульфидов RexMn1-xS (Re = Gd, Sm, Ho) с ГЦК-решеткой типа NaCl в области температур 77-1200 К. С увеличением степени катионного замещения в этих соединениях RexMn1-xS (Re = Gd, Sm, Ho) изменяется тип проводимости от полупроводникового до металлического при критической концентрации Х С. Концентрационный переход металл-диэлектрик в системе Gd XMn 1-XS сопровождается уменьшением величины удельного электросопротивления на 12 порядков и коэффициента термоЭДС (α) на два порядка. Катионное замещение в твердых растворах GdxMn1-xS приводит к смене дырочного типа проводимости (α 0), свойственного моносульфиду марганца, на электронный (α 0). Уменьшение величины α с увеличением содержания гадолиния в решетке MnS указывает на то, что Gd действует как донорная примесь. Для Sm 0,2Mn 0,8S обнаружен резкий максимум сопротивления при Т This paper presents the results of a study of the transport properties of cation-substituted sulfides Re XMn 1-XS (Re = = Gd, Sm, Ho) with FCC NaCl type in the temperature range 77-1200 K. With increasing degree of cation substitution in these compounds Re XMn 1- ХS (Re = Gd, Sm, Ho) the conductivity type changes from the semiconductor to the «metal» at the critical concentration X C. The concentration of metal-insulator transition in the system Gd XMn 1-XS is accompanied by a decreasing in the electrical resistivity of value on 12 orders and Seebeck coefficient (α) is on two orders. The cation-substitution in the solid solutions Gd XMn 1-XS leads to p-type conductivity (α 0), as comprising to electronic (α 0) for manganese monosulfide. Decrease of α with increasing gadolinium concentration in the MnS lattice indicates that the Gd acts as a donor impurity. For Sm 0,2Mn0,8S a maximum resistance at T
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O. B., Galyas A. I., Sokolov V. V.
Заглавие : Study of electrical and thermoelecrical properties of sulfides TmxMn1-xS
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 1. - P.19-24. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416010029
Примечания : Cited References: 25. - This study was supported by the Russian Foundation for Basic Research (project no. 15-42-04099 r_si-bir_a) and State Contract no. 114090470016.
Предметные рубрики: SmxMn1-xS solid-solutions
MnS
Gd
Transition
Transport
Crystal
Аннотация: Variable-valence TmxMn1–xS (0 ⩽ x ⩽ 0.15) compounds have been synthesized and their structural, electrical, and thermoelectrical properties have been studied in the temperature range of 80–1100 K. The regions of existence of solid solutions of sulfides TmxMn1–xS with the NaCl-type fcc lattice have been determined. It has been found that, as thulium ions are substituted for manganese cations, the electrical resistivity increases, and the lattice parameter increases more sharply than that corresponding to the Vegard’s law. The study of the temperature dependences of the thermopower coefficient has revealed that the current carrier sign is retained to 500 K for all the substitution concentrations, and the charge carrier type changes from the hole type to the electron type with variations in the temperature. The experimental data have been explained in terms of the exciton model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Galyas A. I., Demidenko O. F., Makovetskii G. I., Yanushkevich K. I., Ryabinkina L. I., Romanova O. B.
Заглавие : Crystal structure and electrical properties of Gd (x) Mn1-x S and Ti (x) Mn1-x Se solid solutions
Коллективы :
Разночтения заглавия :авие SCOPUS: Crystal structure and electrical properties of GdxMn1 - xS and TixMn1 - xSe solid solutions
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 4. - P687-690. - ISSN 1063-7834, DOI 10.1134/S1063783410040037
Примечания : Cited References: 10. - This study was supported by the Belarussian Republican Foundation for Fundamental Research (project no. F04-182), the Russian Foundation for Basic Research-Belarussian Republican Foundation for Fundamental Research (project no. 08-02-90031), the Russian Foundation for Basic Research (project nos. 09-02-00554-a and 09-02-92001-NNS-a), and the Federal Agency for Education of the Russian Federation (the State Program "Development of the Scientific Potential of the Higher School," project no. 2.1.1/401).
Предметные рубрики: MNSE
SULFIDES
CO
Аннотация: Regions of the existence of sulfide Gd (x) Mn1 - x S and selenide Ti (x) Mn1 - x Se solid solutions have been identified. Their electrical and thermoelectric properties have been studied in the temperature range 80-900 K. It has been established that the substitution of Gd2+ and Ti2+ ions for Mn2+ cations initiates reversal of the type of charge carrier with respect to the starting compounds MnS and MnSe. The cation substitution in solid solutions brings about a change from the hole conduction (alpha 0) characteristic of the manganese monosulfide and monoselenide to the electronic conduction (alpha 0).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makovetskii G. I., Galyas A. I., Demidenko O. F., Yanushkevich K. I., Ryabinkina L. I., Romanova O. B.
Заглавие : Electrical Conductivity and Thermopower in CoxMn1-xS Sulfides
Коллективы :
Разночтения заглавия :авие SCOPUS: Electrical conductivity and thermopower in Co xMn 1 - XS sulfides
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 10. - P1826-1829. - ISSN 1063-7834, DOI 10.1134/S1063783408100065
Примечания : Cited References: 6. - This study was supported by the Russian-Belarussian Foundation for Basic Research within the framework of the joint programs RFFI-BRFFI ( project no. RFFI-BRFFI 04-02-81018-Bel-2004a and project no. BRFFI-RFFIF04R-025).
Аннотация: This paper reports on the results of investigations into the structural, electrical, and thermoelectrical properties of sulfides CoxMn1-xS (0 0), whereas the compound with x = 0.4 exhibits metallic conduction (alpha 0). It is found that the band gap E-g of the compounds under investigation varies in the range from 1.46 eV for alpha-MnS (x
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Ryabinkina L. I., Romanova O. B., Velikanov D. A., Balaev A. D., Balaev D. A., Yanushkevich K. I., Galyas A. I., Demidenko O. F., Bandurina O. N.
Заглавие : Transport properties and ferromagnetism of Co(x)Mn(1-x)Ssulfides
Разночтения заглавия :авие SCOPUS: Transport properties and ferromagnetism of Co x Mn 1 - X S sulfides
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 106, Is. 4. - P765-772. - ISSN 1063-7761, DOI 10.1134/S1063776108040158
Примечания : Cited References: 39
Предметные рубрики: GIANT VOLUME MAGNETOSTRICTION
COLOSSAL MAGNETORESISTANCE
MAGNETIC SEMICONDUCTORS
ELECTRICAL-PROPERTIES
ROOM-TEMPERATURE
ALPHA-MNS
SPINTRONICS
TRANSITION
FEXMN1-XS
FIELDS
Ключевые слова (''Своб.индексиров.''): coulomb interactions--current voltage characteristics--electromotive force--ferromagnetism--magnetic susceptibility--magnetization--thermoelectricity--transport properties--charge susceptibility--external magnetic fields--temperature intervals--thermoelectromotive force--cobalt compounds
Аннотация: We have studied the resistivity and thermoelectromotive force (thermo emf) in a temperature range of T = 80-1000 K, the magnetic susceptibility and magnetization in a temperature range of T= 4.2-300 K at an external magnetic field of up to 70 kOe, and the structural characteristics of CoxMn1 - S-x sulfides (0
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A., Bayukov O. A., Varnek V. A., Sokolov V. V., Bovina A. F.
Заглавие : Mossbauer studies of FexMn1-xS single crystals
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 2. - P237-240. - ISSN 1063-7834, DOI 10.1134/S1063783408020042
Примечания : Cited References: 16
Предметные рубрики: METAL-INSULATOR-TRANSITION
MAGNETIC-PROPERTIES
ALPHA-MNS
SULFIDES
MAGNETORESISTANCE
PRESSURE
SYSTEM
OXIDES
Аннотация: Single crystals of iron manganese sulfides FexMn1-xS (0.25
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Volkov N. V., Petrakovskii G. A., Mita Y., Bayukov O. A., Velikanov D. A., Vorotynov A. A., Sokolov V. V., Bovina A. F.
Заглавие : Metal-insulator transition in FexMn1-xS crystals
Разночтения заглавия :авие SCOPUS: Metal-insulator transition in Fe x Mn1-x S crystals
Место публикации : JETP Letters. - 2007. - Vol. 86, Is. 6. - P.371-374. - ISSN 0021-3640, DOI 10.1134/S0021364007180051
Примечания : Cited References: 15
Предметные рубрики: ALPHA-MNS
PHASE-TRANSITION
SULFIDES
Аннотация: Results of an experimental study of MnS, FeS, and FexMn1-xS single crystals are presented. The phase composition, the lattice parameters, and the state of paramagnetic ions in FexMn1-xS have been determined by x-ray diffraction analysis and Mossbauer spectroscopy. A sequence of transitions have been found in iron manganese sulfide with x = 0.29 at temperatures T-1 approximate to 25-50 K, T-2 approximate to 125 K, and T-3 approximate to 190 K with a change in kinetic properties and the formation of a metallic state at low temperatures T approximate to 2 K. The possibility of a Mott-Hubbard transition in FexMn1-xS sulfides with variation of the composition and the temperature is discussed.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Ryabinkina L. I., Abramova G. M., Balaev A. D., Romanova O. B., Makovetskii G. I., Yanushkevich K. I., Galyas A. I.
Заглавие : Magnetic properties of FexMn1-xS sulfides exhibiting the magnetoresistive effect
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2002. - Vol. 44, Is. 10. - P1925-1928. - ISSN 1063-7834, DOI 10.1134/1.1514782
Примечания : Cited References: 10
Аннотация: The magnetic, electrical, and thermal (derived from DTA data) properties of FexMn1 - xS polycrystalline sulfides (0less than or equal toxless than or equal to0.38) synthesized based on alpha-MnS (NaCl cubic lattice) and exhibiting colossal magnetoresistance were studied. The studies were conducted at temperatures from 77 to 1000 K and magnetic fields of up to 30 kOe. As the degree of cation substitution in the FexMn1 - xS system was increased, the magnetic order was found to change from antiferromagnetic to ferromagnetic. In the high-temperature domain (550-850 K), the samples undergo two phase transitions with critical temperatures T-c1 and T-c2, which are accompanied by reversible anomalies in the magnetization and thermal (DTA) properties and by a semiconductor-metal transition. (C) 2002 MAIK "Nauka/Interperiodica".
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