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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kikoin K. A., Goryachev E. G., Gavrichkov V. A.
Заглавие : A novel explanation of the phase-transition with the valence change in cation-substituted samarium monochalcogenides
Место публикации : Solid State Commun. - 1986. - Vol. 60, Is. 8. - P.663-667. - ISSN 0038-1098, DOI 10.1016/0038-1098(86)90264-4
Примечания : Cited References: 21
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2.

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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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev A. D., Zhukov E. G., Ivanova N. B., Kazak N. V., Ovchinnikov S. G., Popel E. P.
Заглавие : On the two-phase magnetic state in a CuxZn1-xCr2Se4 cation-substituted chalcogenide spinel
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2001. - Vol. 43, Is. 6. - P1089-1092. - ISSN 1063-7834, DOI 10.1134/1.1378149
Примечания : Cited References: 8
Аннотация: The region of the concentration magnetic phase transition in a CuxZn1-xCr2Se4 chalcogenide spinel in which the substituted ion concentration x smoothly varies from 0.1 to 0.2 with a step of 0.02 is thoroughly investigated. An anomalous behavior of the Curie temperature is observed. This anomaly is associated with the nucleation of ferromagnetically ordered microregions in the vicinity of Cr ions with an intermediate valence and subsequent long-range magnetic ordering at a critical Cu concentration in the range 0.12 x(c) 0.14. The possible coexistence of ferro- and antiferromagnetism in the same temperature range is revealed. (C) 2001 MAIK "Nauka/Interperiodica".
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Beznosikov B. V., Aleksandrov K. S.
Заглавие : Prediction of pra-phases of layered perovskite-like structures with cation vacancies
Место публикации : J. Struct. Chem. - 2002. - Vol. 43, Is. 1. - P.172-175. - ISSN 0022-4766, DOI 10.1023/A:1016098521933
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zinenko V. I., Sofronova S. N.
Заглавие : Statistical mechanics of cation ordering and lattice dynamics of PbZrxTi1-xO3 solid solutions
Разночтения заглавия :авие SCOPUS: Statistical mechanics of cation ordering and lattice dynamics of PbZr xTi1-xO3 solid solutions
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 7. - P1291-1300. - ISSN 1063-7834, DOI 10.1134/1.1778455
Примечания : Cited References: 18
Предметные рубрики: PEROVSKITE
Аннотация: An effective Hamiltonian for Zr-Ti cation ordering in PbZrxTi1 - xO3 solid solutions is written out. To determine the parameters of the effective Hamiltonian, a nonempirical calculation is performed within an ionic-crystal model taking into account the deformation and dipole and quadrupole polarizabilities of ions. The thermodynamic properties of cation ordering are studied using the Monte Carlo method. The calculated phase transition temperatures (180 and 250 K for the concentrations x = 1/3 and 1/2, respectively) are much lower than the melting temperature of the compound under study. At such temperatures, the ordering kinetics is frozen and, in reality, the phase transition to the ordered phase does not occur, in agreement with experimental observations. Within the same ionic-crystal model, we calculated the high-frequency permittivity, Born dynamic charges, and the lattice vibration spectrum for a completely disordered phase and certain ordered phases. It is shown that soft vibration modes, including ferroelectric ones, exist in the lattice vibration spectrum of both the completely disordered and the ordered phases. (C) 2004 MAIK "Nauka / Interperiodica".
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6.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zinenko V. I., Sofronova S. N.
Заглавие : The nonempirical calculation of the cation ordering and lattice dynamics in the solid solutions of PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3
Место публикации : 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA): WILEY-V C H VERLAG GMBH, 2004. - P3047-3051. - ISBN 3-527-40588-7, DOI 10.1002/pssc.200405286
Примечания : Cited References: 10
Аннотация: An effective Hamiltonian for the study of Sc-Nb(Ta) cation ordering in PbSc1/2Nb(Ta)(1/2)O-3 solid solutions is written out. To determine the parameters of the effective Hamiltonian, a nonempirical calculation is performed within an ionic-crystal model taking into account the deformation, dipole and quadrupole polarizabilities of ions. The phase transition temperatures are calculated by mean field, cluster approximations and Monte-Carlo method. Within the same ionic-crystal model, we calculated the high-frequency permittivity, Born dynamic charges, and the phonon spectrum for a completely disordered and ordered phases. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zinenko V. I., Sofronova S. N.
Заглавие : Statistical mechanics of cation ordering in PbSc1/2Ta1/2O3 and PbSc1/2Nb1/2O3 solid solutions
Разночтения заглавия :авие SCOPUS: Statistical mechanics of cation ordering in PbSc1/2Ta 1/2O3 and PbSc1/2Nb1/2O3 solid solutions
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 12. - P2309-2314. - ISSN 1063-7834, DOI 10.1134/1.2142896
Примечания : Cited References: 17
Предметные рубрики: PHASE-TRANSITION
PEROVSKITE
DISORDER
FERROELECTRICS
CRYSTALS
MODEL
Аннотация: A model Hamiltonian for B cation ordering (Sc-Nb(Ta)) in PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3 solid solutions is constructed. The parameters of the model Hamiltonian are determined from the ab initio calculation within the ionic crystal model with allowance made for the deformability and the dipole and quadrupole polarizabilities of the ions. The temperatures of the phase transition due to the ordering of the B cations are calculated by the Monte Carlo method in the mean-field and cluster approximations. The phase transition temperatures calculated by the Monte Carlo method (1920 K for PbSc1/2Ta1/2O3 and 1810 K for PbSc1/2Nb1/2O3) are consistent with the experimental data (1770 and 1450 K, respectively). The thermodynamic properties of the cation ordering are investigated using the Monte Carlo method. (c) 2005 Pleiades Publishing, Inc.
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8.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Fokina V. D., Flerov I. N., Molokeev M. S., Pogoreltsev E. I., Bogdanov E. V., Laptev Y. V.
Заглавие : Effect of central cation substitutionon the properties and phase transitions in (NH4)3Me(O2)2F4 oxyfluorides
Коллективы : Воронежский государственный технический университет, Российская академия наук, International Seminar on ferroelastic physics (6; 2009 ; Sept. 22-25; Voronezh), Международный семинар по физике сегнетоэластиков (6(11); 2009 ; 22-25 сент.; Воронеж)
Место публикации : The 6th International Seminar on Ferroelastic Physics: abstract book. - Voronezh, 2009. - P.5
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Ryabinkina L. I., Romanova O. B., Sokolov V. V., Pichugin A. Y., Galyas A. I., Demidenko O. F., Makovetskii G. I., Yanushkevich K. I.
Заглавие : Magnetic and electrical properties of cation-substituted sulfides Me (x) Mn1-x S (Me = Co, Gd)
Коллективы : Russian Foundation for Basic Research RFFI-BRFFI [0802-90031]; FFIRB [F08R-037]
Разночтения заглавия :авие SCOPUS: Magnetic and electrical properties of cation-substituted sulfides Me x Mn1 - X S (Me = Co, Gd)
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 4. - P698-701. - ISSN 1063-7834, DOI 10.1134/S1063783409040076
Примечания : Cited References: 17. - This study was supported by the Russian Foundation for Basic Research RFFI-BRFFI (project no. 0802-90031) and FFIRB (project no. F08R-037).
Предметные рубрики: ALPHA-MNS
MAGNETORESISTANCE
TRANSPORT
Аннотация: The temperature dependences of the specific magnetization sigma and the electrical resistivity rho of Me (x) Mn1 - x S single crystals (Me= Co, Gd; x= 0.05) have been studied in the temperature range 80 K T 1000 K. The samples under study have revealed the presence of a spontaneous magnetic moment below the N,el temperature (T (N)) and ferromagnetic clusters in Gd0.05Mn0.95S in the temperature range 146 K T 680 K. Substitution of gadolinium for manganese initiates a transition from p-type to n-type conduction. The change in the conduction type is accompanied by an increase in the electrical resistivity at 300 K by approximately one order of magnitude and, accordingly, by a decrease in the activation energy. The magnetic and electrical properties of the crystals under study have been interpreted in terms of the cluster model with temperature-dependent ferromagnetic exchange and an electron localized in this cluster.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zamkova N. G., Zinenko V. I.
Заглавие : Effect of cation substitution on the lattice dynamics and ferroelectric instability of cubic BaTiO3 and BaZrO3 doped with Bi and La ions
Коллективы : Russian Foundation for Basic Research [07-02-00069]
Разночтения заглавия :авие SCOPUS: Effect of cation substitution on the lattice dynamics and ferroelectric instability of cubic BaTiO3 and BaZrO3 doped with Bi and la ions
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 5. - P973-981. - ISSN 1063-7834, DOI 10.1134/S1063783409050151
Примечания : Cited References: 11. - This work was supported by the Russian Foundation for Basic Research, project no. 07-02-00069.
Предметные рубрики: CERAMICS
Аннотация: The spectra of lattice vibration frequencies of solid solutions Ba1 - x Bi(2x/3)a-- Ti-x/3(Zr)O-3 and Ba1 - x La (x) Ti(Zr)(1 - x/4)a-- O-x/4(3) are calculated in terms of a generalized Gordon-Kim model with inclusion of the dipole and quadrupole polarizabilities. Over the entire concentration range, the calculated phonon spectra contain a ferroelectric soft mode. The effect of various interactions on the ferroelectric instability of these solid solutions is studied. It is shown that the character of ferroelectric instability is largely determined by the mechanism of charge compensation.
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