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Khomskii, D I, E-mail: khomskii@ph2.uni-koeln.de2011
AbstractAbstract
[en] Recent studies demonstrated that there may appear different novel states in correlated systems close to localized-itinerant crossover. Especially favourable conditions for that are met in low-dimensional and in frustrated systems. In this paper I discuss on concrete examples some of such novel states. In particular, for some spinels and triangular systems there appears a 'partial Mott transition', in which first some finite clusters (dimers, trimes, tetramers, heptamers) go over to the itinerant regime, and the real bulk Mott transition occurs only later. Also some other specific possibilities in this crossover regime are shortly discussed, such as spin-Peierls-Peierls transition in TiOCl, spontaneous charge disproportionation in some cases, etc.
Source
International Conference on Frustration in Condensed Matter (ICFCM); Sendai (Japan); 11-14 Jan 2011; Available from http://dx.doi.org/10.1088/1742-6596/320/1/012055; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Conference
Journal
Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 320(1); [9 p.]

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AbstractAbstract
[en] The effect of a conductive agent on the structural and electrochemical properties of Li4Ti5O12(LTO) spinel was investigated through neutron diffraction during Li intercalation and electrochemical measurements. The charging process of LTO is known as transformation of the white (Li3)8a[LiTi5]16dO12 into a dark-colored (Li3-X)8a[LiX+Y]16c[LiTi5]16dO12 by incorporating the inserted Li into octahedral 16c sites, and the Li in tetrahedral 8a sites shifted to 16c sites. The occupancy of the tetrahedral 8a site varied with the existence of carbon in the electrode. Without carbon, the lattice parameter and cell volume of LTO decreased more notably than in the carbon-containing LTO electrode during Li insertion process. These phenomena might be attributed that the Li occupancy of the tetrahedral 8a of the LTO electrode without carbon was less than that of the carbon-containing LTO electrode
Primary Subject
Source
12 refs, 4 figs, 1 tab
Record Type
Journal Article
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964;
; v. 33(12); p. 4059-4062

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Sukhorukov, Yu. P.; Telegin, A. V.; Bebenin, N. G.; Nosov, A. P.; Bessonov, V. D.; Buchkevich, A. A.; Patrakov, E. I., E-mail: bessonov@imp.uran.ru2018
AbstractAbstract
[en] It is shown that magnetoreflectance of natural light up to +4% exists in magnetostrictive ferrimagnetic spinel CoFe2O4 single crystal; this effect is associated with a change of the fundamental absorption edge, the impurity absorption band, and the phonon spectrum under the action of a magnetic field. The correlation between the field dependences of magnetoreflectance and magnetostriction has been established. The physical mechanisms responsible for the spectral and field peculiarities of magnetoreflection have been explained. It is shown that the magnetorefractive effect in CoFe2O4, which is associated with magnetoelastic properties of the spinel, amounts to +1.5 × 10–3 in magnetic fields exceeding the saturation field. Analysis of magnetooptical and magnetoelastic data has made it possible to estimate deformation potential as Ξu = 20 eV for the valence band of the spinel.
Primary Subject
Source
Copyright (c) 2018 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Journal of Experimental and Theoretical Physics; ISSN 1063-7761;
; CODEN JTPHES; v. 126(1); p. 106-114

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AbstractAbstract
[en] Transition-metal spinels (general formula AB2X4) have been, for many years, the subject of intense experimental and theoretical activity. Structurally, the most interesting feature of these systems is the fact that the B cation occupies the nodes of a pyrochlore lattice, which is known to be geometrically frustrated. Therefore, one can explore how the natural tendency of the transition metals to order in the charge, magnetic and orbital sectors is affected by geometrical frustration. Recently, orbital ordering has become a topical subject in a variety of both non-frustrated systems, such as manganites and other perovskites, and in the spinels. In this paper, I review the recent experimental activity on the subject of orbital ordering in transition-metal spinels and relate this to models of orbital ordering that are being developed by theoreticians
Source
S1367-2630(05)88250-3; Available online at http://stacks.iop.org/1367-2630/7/53/njp5_1_053.pdf or at the Web site for the journal New Journal of Physics (ISSN 1367-2630) http://www.iop.org/; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
New Journal of Physics; ISSN 1367-2630;
; v. 7(1); p. 53

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External URLExternal URL
Lemeshev, D O; Senina, M O; Pedchenko, M S, E-mail: diolem@muctr.ru, E-mail: snnmarina@rambler.ru, E-mail: pesenkatalor@gmail.com2018
AbstractAbstract
[en] The prospects of use optically transparent ceramics from aluminum magnesium spinel are considered. Technologies of synthesis of spinel powders f for the subsequent application when receiving transparent ceramics are described. (paper)
Primary Subject
Source
3. International Youth Scientific Forum with International Participation on New Materials; Moscow (Russian Federation); 21-24 Nov 2017; Available from http://dx.doi.org/10.1088/1757-899X/347/1/012055; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Conference
Journal
IOP Conference Series. Materials Science and Engineering (Online); ISSN 1757-899X;
; v. 347(1); [7 p.]

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Das, D.; Sudarshan, M.; Krishna, J.B.M.; Chintalapudi, S.N.; Majumdar, C.K.
Proceedings of the solid state physics symposium. Vol. 35C1993
Proceedings of the solid state physics symposium. Vol. 35C1993
AbstractAbstract
[en] Short communication. 1 ref., 1 fig
Source
Department of Atomic Energy, Bombay (India). Board of Research in Nuclear Sciences; 527 p; 1993; p. 434; Bhabha Atomic Research Centre; Bombay (India); Solid state physics symposium; Tirupati (India); 24 Dec 1992 - 1 Jan 1993
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Book
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Conference
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Related RecordRelated Record
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AbstractAbstract
[en] This paper deals with the problem of determining the heat capacity anomaly associated with a first-order transition when using relaxation calorimetry. A method of data recording and analysis is proposed, which is shown to be well suited to investigate such a feature, including its hysteretical character. This technique is applied to spinel vanadates, allowing us to shed light on a recent controversy about the double-transition which takes place in these oxides.
Secondary Subject
Source
S0953-8984(09)95500-X; Available from http://dx.doi.org/10.1088/0953-8984/21/7/075403; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Surzhkov, A.P.; Frangul'yan, T.S.; Gyngazov, S.A.; Koval', N.N.; Devyatkov, V.N.
Abstracts of 5. International conference 'Nuclear and Radiation Physics'2005
Abstracts of 5. International conference 'Nuclear and Radiation Physics'2005
AbstractAbstract
[en] The paper is presenting the first attempt of examination carrying out of high-current pulse beams action effects by low-power electrons on oxide ceramic structures. In capacity of examination object was lithium-titanium ceramics with chemical composition Li0.649Fe1.598Ti0.5Zn0.2Mn0.05104. Irradiation has been carried out in vacuum (P=10-2 Pa) by single pulses of beam of lo power electrons with following parameters: E=15 keV, current density in the pulse 12-25 A/cm2, pulse duration 50 μs, frequency of pulses succession 1 Hz. It is determined, that electron treatment does not provoke noticeable changes on the ceramics phase composition, which preserves its spinel structure
Original Title
Izmenenie mikrotverdosti ferritnoj keramiki pod dejstviem sil'notochnykh impul'snykh puchkov nizkoehnergeticheskikh ehlektronov
Primary Subject
Source
Natsional'nyj Yadernyj Tsentr Respubliki Kazakhstan, Kurchatov (Kazakhstan); Inst. Yadernoj Fiziki Natsional'nogo Yadernogoj Tsentra Respubliki Kazakhstan, Almaty (Kazakhstan); 658 p; ISBN 9965-675-22-8;
; 2005; p. 333-337; 5. International conference 'Nuclear and Radiation Physics'; 5. Mezhdunarodnaya konferentsiya 'Yadernaya i Radiatsionnaya Fizika'; Almaty (Kazakhstan); 26-29 Sep 2005

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Book
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Luczynska-Loska, K.
Institute of Physics and Nuclear Techniques, Krakow (Poland)1974
Institute of Physics and Nuclear Techniques, Krakow (Poland)1974
AbstractAbstract
No abstract available
Source
1974; 18 p
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Report
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Numerical Data
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Talanov, M. V.; Talanov, V. M.; Shirokov, V. B., E-mail: valtalanov@mail.ru2017
AbstractAbstract
[en] The review briefly outlines the results of authors’ theoretical research into unique hyperkagome atomic and orbital order in geometrically frustrated iridium spinel-like structures. The structural mechanism of formation of the hyper-kagome atomic order is established. It is shown that closed loops of Ir—Ir bonds represent a fundamental feature of the iridium spinel-like structures. Each loop consists of ten atoms, thus being a decagon. We assume that decagons are responsible for abnormal chemical and physical properties of crystals. A prediction is made of structural types of crystals in which the hyper-kagome atomic order can exist.
Primary Subject
Source
Copyright (c) 2017 Springer Science+Business Media, LLC, part of Springer Nature; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
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