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- W2010276500 abstract "A whole series of room temperature pervoskite-like magnetic oxides has been synthesized by using either the high pressure or the hydrothermal technique. Their cubic structure is derived by doubling the lattice parameter of the undistorted perovskite structure. Ln3+ and Cu2+ are ordered on the 12 coordinated sites, but due to the distortion of the oxygen sublattice, the Cu2+ site is actually square planned with 8 extra neighbours much farther. Stoichiométric compounds corresponding to the formula LnCu3Mn4O12 have been obtained under high pressure conditions (60 kbar). They are ferrimagnetic with Curie temperature ranging from 100 to 160°C. When regular hydrothermal synthesis conditions are used (700°C, 2 kbar), a reduction of Mn4+ cations is observed, resulting in a partial substitution of Cu2+ by Mn3+ on the Jahn-Teller sites. The composition [YCu2+2.3Mn3+0.7]VIMn4O12 has been determined by neutron diffraction. It was shown from the magnetic structure that IVMn3+ and VIMn (octahedric) are coupled ferromagneticly while Cu2+ and VIMn are antiferromagnetic. This leads to a complex ferromagnetic structure with a spontaneous magnetization much larger than in stoichiometric YCu3Mn4O12. Magnetization as large as 17μB/formula have been obtained at 4 K(Nd3+, Pr3+)." @default.
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- W2010276500 date "1980-01-01" @default.
- W2010276500 modified "2023-09-25" @default.
- W2010276500 title "Ferromagnetic oxides Ln3+/Cu3]Mn4O12 (Ln = La TO Lu and Y)" @default.
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- W2010276500 doi "https://doi.org/10.1016/0304-8853(80)90307-8" @default.
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