J. Phys. IV France 07 (1997) C1-333-C1-334
Magnetic Properties of PbFe12O19 Hexaferrites Powders Obtained by Metallorganic DecompositionS. Diaz1, N. Suárez1, J.C. Faloh1, J.L. Sánchez1, F. Leccabue2, B.E. Watts2 and G. Albanese3
1 Facultad de Fisica/IMRE, Universidad de La Habana, La Habana 10400, Cuba
2 Istituto MASPEC/CNR, Via Chiavari 18/A, 43100 Parma, Italy
3 Dipartimento di Fisica, Università di Parma, v. le delle Scienze, 43100 Parma, Italy
Magnetoplumbite (PbFe12O19) powders were obtained by the thermal decomposition, at 900 °C of nitrates dissolved in ethylene glycol. The hysteresis loops showed that the predominant magnetisation mechanism is coherent rotation and a remarkably high value of coercivity (5 kOe) was obtained. Cell parameters, Curie temperature and hysteretic properties are reported. A study of the magnetic after effect is also presented. The results are compared with those obtained for Sr-M sintered compacts with submicronic particles obtained from chemically coprecipitated powders. The dependence of the viscosity coefficient (S) and the viscosity parameter (Sv) on the applied magnetic field were determined at temperatures between 77 and 300 K.
© EDP Sciences 1997