Papers by Keyword: Small-Angle Neutron Scattering

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Authors: A. Al-Hajry, Mohammad Al-Assiri, Stefano Enzo, Kwang Su Na, Neil Cowlam, J. Hefne, L. Jones, Francesco Delogu, H. Brequel
Authors: Stefanus Harjo, Yoshinobu Motohashi, Jan Šaroun, Vasyl Ryukhtin, Pavel Strunz, Matthias Baron, Rudolf Loidl
Authors: Jörg F. Löffler, William L. Johnson, W. Wagner, P. Thiyagarajan
Authors: A.V. Feoktystov, M.V. Avdeev, V. L. Aksenov, V.I. Petrenko, L.A. Bulavin, Doina Bica, L. Vekas, V.M. Garamus, R. Willumeit
Abstract: Contrast variation method in small-angle neutron scattering (non-polarized neutrons) is applied to magnetic fluids (MFs) with magnetite dispersed in benzene and coated with myristic or oleic acid in zero external magnetic field. The basic functions approach for polydisperse superparamagnetic systems is used to get structure parameters of particles in MFs.
Authors: Alexis Deschamps, Fabien Perrard, Françoise Bley, Patricia Donnadieu, Philippe Maugis
Abstract: This paper presents a physically based precipitation model which aims at describing precipitation kinetics when it occurs exclusively on dislocations. We present specific nucleation, growth and coarsening equations, which are integrated in a set of differential equations. This model is successfully applied to the case of precipitation of NbC in a ferritic steel, whose kinetics has been determined by small-angle neutron scattering.
Authors: V.I. Petrenko, M.V. Avdeev, V. L. Aksenov, L.A. Bulavin, L. Rosta
Abstract: The microstructure of ferrofluids (magnetite/oleic acid/benzene) with an excess of free oleic acid is investigated by small-angle neutron scattering (SANS). For such excess higher than 25 vol. % a sharp break in the stability of ferrofluids occurs followed by coagulation and precipitation. Below this value the influence of the surfactant excess on the stability of ferrofluids is insignificant; neither particle aggregation nor surfactant agglomeration is observed. The interaction of free acid molecules in the ferrofluids is compared with that in pure benzene solutions. A significant increase in the attraction is observed for acid molecules in the ferrofluids, which is related to the loss of magnetic fluids stability at high excess of acid.
Authors: Jörg F. Löffler, W. Wagner, Helena Van Swygenhoven
Authors: M.L. Craus, E. Anitas, N. Cornei, A. Islamov, V. Garamus
Abstract: New La0.54Ho0.11Sr0.35Mn1-xCuxO3 manganites were obtained by sol-gel method using oxides and acetates and sintered finally in air at 12000 C for 15 h. The samples were studied by X-ray diffraction, magnetic and electric methods. Space group, lattice constants, average size of the crystalline blocks and positions of cations/anions in the unit cell, were determined using the FullProf code. The samples contain only a perovskite phase with an orthorhombic structure (Pnma space group). Small-angle neutron scattering (SANS) measurements were performed on the SANS-1 setup at the FRG-1 reactor of the GKSS Research Centre (Geesthacht, Germany). The sizes of magnetic clusters have been determined at room temperature.
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