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AbstractAbstract
[en] Manganese dioxide has been used to scavenge radionuclides from water solutions. In this work the behaviour of MnO2 with uranium and plutonium has been studied by batch equilibration experiments, column experiments and cartridge experiments. 8 refs.; 2 figs.; 3 tabs
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Source
5. Symposium on environmental radiochemical analysis; Harwell (UK); 1-3 Oct 1986
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Journal Article
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AbstractAbstract
[en] We present a band-selective NMR method to probe the constituent electronic bands separately in the condensed molecular matter. This method is applied to an organic-inorganic π-d hybrid metal, and its utility to give the static and dynamic spin susceptibilities for the constituent bands is demonstrated. The analysis of the results uncovers an exotic feature; the antiferromagnetic and ferromagnetic correlations are enhanced in separate bands in a single material. This finding provides a novel scope connecting the metal-insulator transitions in this system and the manganese oxides
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Source
Othernumber: PRLTAO000087000010107602000001; 017136PRL
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Journal Article
Journal
Physical Review Letters; ISSN 0031-9007;
; v. 87(10); p. 107602-107602.4

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Vinod, K; Satya, A T; Ravindran, N Radhikesh; Mani, Awadhesh, E-mail: mani@igcar.gov.in2018
AbstractAbstract
[en] Polycrystalline CuMn2O4 is synthesized by solid state reaction method. Structural and magnetization studies reveal that the sample is multiphase with CuMn2O4 as primary phase and Mn3O4 as secondary phase. Magnetocaloric properties such as isothermal magnetic entropy change (−ΔS M) and refrigerant capacity (RC) are evaluated from isothermal magnetization data. Value of isothermal magnetic entropy change () in the 40–80 K temperature range is 3.5–4.6 J kg−1K−1, for a field change of ΔH = 70 kOe. Value of refrigeration capacity (RC) evaluated for the same field change (ΔH = 70 kOe) is ∼190 J/kg for the T cold and T hot pair of 40 and 90 K respectively. Also value of remains almost constant over a broad temperature range of 60–80 K. (paper)
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Available from http://dx.doi.org/10.1088/2053-1591/aac1ec; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
Materials Research Express (Online); ISSN 2053-1591;
; v. 5(5); [6 p.]

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Galliez, Kévin; Deniard, Philippe; Lambertin, David; Jobic, Stéphane; Bart, Florence, E-mail: david.lambertin@cea.fr2013
AbstractAbstract
[en] We investigate the influence of MnO2 polymorphism form on MnO2/Ag2O hydrogen getter. The results show that the performances strongly depend on the polymorphism form of manganese oxide. The nsutite γ-MnO2 phase, which consists of a random intergrowth of MnO2–ramsdellite and MnO2–pyrolusite building blocks, shows the more promising performances to trap H2 via the formation of hydroxyl groups. This observation is especially relevant for compounds with a low pyrolusite/ramsdellite ratio and a high rate of microtwinnings
Primary Subject
Source
S0022-3115(13)00556-4; Available from http://dx.doi.org/10.1016/j.jnucmat.2013.03.053; Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] In 1986 Alex Mueller and Georg Bednorz of IBM Zurich discovered high-temperature superconductivity in copper-based oxides. This finding, which was rewarded with the Nobel Prize for Physics in the following year, triggered intense research into the properties of the transition metal oxides. Since then scientists have questioned the very nature of the metallic state in these materials. A few years after the initial discovery, in 1993, more excitement greeted reports that certain manganese oxides showed a huge change in electrical resistivity when a magnetic field was applied. This effect is generally known as magnetoresistance, but the resistivity change observed in these oxides was so large that it could not be compared with any other forms of magnetoresistance. The effect observed in these materials the manganese perovskites was therefore dubbed ''colossal'' magnetoresistance to distinguish it from the giant magnetoresistance observed in magnetic multilayers. In this article the author explains why magnetoresistance is an expanding field of physics research. (UK)
Source
Country of input: International Atomic Energy Agency (IAEA); This record replaces 31039427
Record Type
Journal Article
Journal
Physics World; ISSN 0953-8585;
; v. 12(2); p. vp

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Plotnikov, V.I.; Medvedeva, Z.V.; Zhabykbaev, G.T.
Abstracts of 5. International conference 'Nuclear and Radiation Physics'2005
Abstracts of 5. International conference 'Nuclear and Radiation Physics'2005
AbstractAbstract
[en] In the present report the sorption character of uranium (IV) in the static conditions on the thin layer sorbents with application of the clinoptilolite of the Chankan deposit of the Republic of Kazakhstan is shown. A wide circle of metal hydroxides - in both the individual form and in the their mixture - is used. It is shown that the most sorptive capacity against the uranium (IV) has the modified clinoptilolite of MnO2
Original Title
Sorbtsiya urana klinoptilolitom, modofotsirovannym gidroksidami nekotorykh mretllov
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. 549-550; 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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AbstractAbstract
[en] Periodically ordered mesoporous manganese oxides were synthesized in a single and double replication procedure. Mesoporous SBA-15 and -16 silica and their reverse replica carbons were successively used as hard templates. The silica and carbon pore systems were infiltrated with Mn(NO3)2·xH2O or Mn(AcAc)2, which was then converted to Mn2O3 at 873 K: the silica and carbon matrix were finally removed by NaOH solution or calcinations in air. The structure of the mesoporous Mn2O3, using a carbon template, corresponds to that of the original SBA-15 and SBA-16 silica. The products consist of hexagonally arranged cylindrical mesopores with crystalline pore walls or cubic mesoporous pores. The structure of replica has been confirmed by XRD, TEM analysis, and its electrochemical properties were tested with cyclic voltammetry. Formation of Mn2O3 inside the mesoporous carbon pore system showed much improved electrical properties
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10 refs, 8 figs, 1 tab
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Journal Article
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Bulletin of the Korean Chemical Society; ISSN 0253-2964;
; v. 32(1); p. 186-190

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AbstractAbstract
[en] Highlights: • The layered MnO2 nanosheets are used for oxygen reduction reaction. • The MnO2 nanosheets exhibit a high catalytic activity for oxygen reduction. • Oxygen reduction involves a coexisting pathways via 2- and 4-electron transfer. - Abstract: In this study, a novel layered manganese oxide (MnO2) nanosheets was prepared by using a facile method with graphene oxide as the template, and its electrocatalytic performance was studied. The results of cyclic voltammograms (CV) and the rotating disk electrode (RDE) measurements show that the MnO2 nanosheets possess excellent electrocatalytic activity for oxygen reduction reaction (ORR) in alkaline medium. The electron transfer number of the nanosheets electrode was measured to be 3.4, which lied between the two-electron and four-electron processes, suggesting that the oxygen reduction on nanosheets might proceed by a coexisting pathway involving the two-electron and four-electron transfer
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Secondary Subject
Source
S0013-4686(14)00663-X; Available from http://dx.doi.org/10.1016/j.electacta.2014.03.150; Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] The resistivity of Pr0.65Ca0.35MnO3 films prepared by pulsed laser deposition has been measured in the temperature range 4.2-300 K. The formation of metallic phase is suggested by the analysis of the temperature dependence of resistivity at low temperatures under zero-magnetic field. It is shown that the appearance of the charge-ordered state at 205 K can be controlled by the lattice strains accumulated during the film growth. The charge-ordering energy gap was estimated to be 77.5 meV from the experimental data. Experimental results are interpreted on the basis of the phase-separation model. (author). Letter-to-the-editor
Source
Country of input: International Atomic Energy Agency (IAEA); 29 refs; This record replaces 31045975
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Journal Article
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Journal of Physics. Condensed Matter (Online); ISSN 1361-648X;
; v. 12(6); p. L133-L138

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AbstractAbstract
[en] The slime formation in acidic electrolytes of copper with several metallic impurities has been studied. On Pb-Ca-SN anode surface firstly the formation of PbSO4 takes place, then, it is transformed in PbO2, which covers the anode surface. It was experimentally established the formation of a manganese dioxide layer at the anode. This layer was always composed of a thick external layers of non-adhering and easily removable scales, and of a thin internal layer, which adheres relatively well to the surface of the electrode. It was found that the manganese dioxide present in the slime is of different nature: a non-adhering layer produced by electrolysis (ε-MnO2) on the PbO2 surface and a pure chemical precipitate in the solution (β-MnO2). Lead sufate was found on the β-MnO2 layer when iron was in the electrolyte. When arsenic or antimony was present in the electrolyte, the slime was lead sulfate amorphous compounds of these ions. Slime of Chilean electrowinning (EW) plants is also discussed. (Author) 33 refs
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Journal Article
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Revista de Metalurgia; CODEN RMTGAC; v. 40; p. 13-20
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