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Magnetic and Magnetocaloric Properties of Ca0.97La0.03MnO3 Manganites
Gong, G. D.,Hu, P. F.,Li, Y.,Kim, D. H.,Liu, C. L.,Phan, T. L.,Ho, T. A.,Yu, S. C.,Telegin, A.,Naumov, S. V. Springer Science + Business Media 2016 Journal of electronic materials Vol.45 No.7
<P>In spite of many previous studies on electron-doped CaMnO3 perovskite manganites, detailed investigations into the influence of low-doping concentrations on their magnetic and magnetocaloric (MC) properties have not been carried out yet. Additionally, there is still the lack of the comparison between single-crystal (SC) and polycrystalline (PC) materials. Dealing with these problems, we prepared orthorhombic Ca0.97La0.03MnO3 SC and PC samples. Magnetization measurements versus the temperature and magnetic field revealed remarkable differences in the magnetic property, particularly around the antiferromagnetic/ferromagnetic-paramagnetic phase-transition region. The analyses of the magnetization versus magnetic field, M(H), data indicated a weak MC effect with magnetic-entropy changes less than 0.1 J kg(-1) K-1 for an applied field interval H = 10 kOe because ferromagnetic interactions between Mn3+ and Mn4+ ions are insignificant. The differences in the magnetic and MC properties of the SC and PC samples are ascribed to the effects of grain boundary, magnetic anisotropy, and nonstoichiometry in oxygen.</P>
Preparation and characterization of HTSC LuBa2Cu3O6+x single crystals
V.E.Fedorov,M.Yu.Kameneva,N.V.Podberezskaya,D.Yu.Naumov,N.F.Beizel,U-HyonPaeka,L.P.Kozeeva 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3
For the first time large HTSC (high temperature superconductive) crystals of LuBa2Cu3O6+x (up to 5´5´0.2 mm3) were obtained from the Lu2O3-BaO-CuO system by a flux growth method. The crystals obtained were characterized by differential thermal analysis (DTA), chemical and X-ray diffraction analyses. The temperature of incongruent melting of the phase was defined more exactly (950±5oC). The composition of crystals corresponds to the formula LuBa2Cu3O6+x. The crystal structure of the tetragonal form was determined and x=0 was found for this case.