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.
Similar content being viewed by others
References
H. B. Beer and G. V. Planar, Brit. Communications and Electronics 15 (1958) 939.
S. Y. Tyree, ed., “Inorganic Syntheses” Vol. IX (McGraw-Hill, New York, 1967). p. 152.
J. G. M. De Lau, Ceram. Bull. 49 (1970) 572.
D. G. Wichkham, E. R. Whipple and E. G. Larson, J. Inorg. Nucl. Chem. 14 (1960) 217.
E. C. Alyea, G. Ferguson and R. Restivo, J. Chem. Soc. Chem. Comm. (1975) 269.
R. J. Butcher and E. Sinn, ibid. (1975) 832.
A. F. Cameron, K. P. Forrest, R. H. Nuttall and W. D. Taylor, J. Chem. Soc. (1972) 423.
R. J. Garvey, Coord. Chem. Rev. 3 (1968) 375.
R. L. Carlin and M. J. Baker, J. Chem Soc. (1963) 5008.
C. C. Addison, N. Logan, S. C. Wallwork and O. D. Garner, Quart. Rev. Chem. Soc. 25 (1971) 289.
Joint Committee on Powder Diffraction Standards (Swarthmore, Pennsylvania), Power Diffraction File, File No. 13-534.
Idem, File No. 9-418.
Idem, File No. 4-0835.
Idem, File No. 22-1086.
Idem, File No. 10-325.
Idem, File No. 10-319.
Idem, File No. 11-614.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Richardson, R.T. A convenient method for the small-scale preparation of some ferrites. J Mater Sci 15, 2569–2572 (1980). https://doi.org/10.1007/BF00550761
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00550761