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- W2042008291 abstract "Magnetic properties of new materials, based on the general formula CO x Ni y Mn z O 4 (x+y+z= 3), have been investigated as a function of magnetic field and temperature. The behavior observed in the paramagnetic regime (220 K ≤ T ≤ 400 K) shows a direct correlation with the nominal cation concentration. The paramagnetic-ferrimagnetic transition which takes place at T = T depends on the overall composition, going from T c = 120 K (for Co 0 . 2 NiMn 1 . 8 O 4 ) up to T c = 210 K (for Co 1 . 2 Ni 0 . 3 Mn 1 . 5 O 4 ). A second transition is observed at lower temperatures, corresponding to a second ordered magnetic sublattice. This second transition takes place at about 60 K (for Co 0 . 6 NiMn 1 . 4 O 4 ), increasing with the cobalt content up to about 160 K. Under an external magnetic field, both transitions merge into a single one, with a characteristic temperature T m a x , which rapidly decreases with increasing field. Magnetization loops M(H) obtained at 5 K show a typical behavior of soft magnetic materials, with low coercive fields. Low conductivity values were observed at room-temperature, increasing by a factor of 200-1000 at high temperatures (400 C), which make these compounds to be very interesting materials for potential applications as NTCR thermistors." @default.
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- W2042008291 date "2004-05-01" @default.
- W2042008291 modified "2023-09-23" @default.
- W2042008291 title "Magnetic properties of (Co, Ni, Mn)3O4 spinels" @default.
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