Digitale Medien
Springer
Journal of materials science
15 (1980), S. 2569-2572
ISSN:
1573-4803
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
Notizen:
Abstract The ferromagnetic spinels, MnFe2O4, CoFe2O4 and NiFe2O4, were prepared in small amounts by the thermal decomposition of mixtures of pyridine-1-oxide and pyridine complexes of the corresponding metal nitrates. The thermal decomposition of the chosen complexes proceeds through a liquid stage and this helps to ensure that there is a homogeneous product and that there is rapid formation of the spinel structure when residues are heated between 1000 and 1200° C. Thin layers of these spinels may be obtained by using a solution of the metal complexes in ethan-1,2-diol. X-ray diffraction and visual examination showed that the initial oxide form is a glassy solid and that the lattice order increases with temperature. CoFe2O4 and NiFe2O4 formed directly from the glassy state but a 2Fe∶:1Mn mixture initially forms Fe2O3 and an unidentified manganese oxide. These reacted at 1200° C to form MnFe2O4.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00550761
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