Conclusions
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1.
Even a very small addition of V2O5 to a Ni-Zn ferrite with a slight excess of iron helps to increase the density of the material during sintering, but has no effect upon the formation of spinel phase.
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2.
V2O5 promotes the densification of such a ferrite during sintering by increasing the concentration of ionic defects of equilibrium in the material, i.e., by intensifying the volume diffusion of atoms and vacancies.
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3.
The addition of V2O5 appears to have no significant effect upon the sintering of a Ni-Zn ferrite with a deficiency of Fe2O3 (< 50 mol.%), which means that, in the absence of cationic vacancies, the influence exerted by V2O5 on the sinterability of Ni-Zn ferrites cannot be linked solely with its acting as a flux.
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Literature cited
L. C. F. Blackman, Trans. Brit. Ceram. Soc.,63, No. 7, 331 (1964).
Yu. D. Tret'yakov, Thermodynamics of Ferrites [in Russian], Khimiya, Leningrad (1967), p. 272.
V. G. Glotov, Poroshkovaya Met., No. 2 (1969).
French Pat. No. 232764, Oct. 12, 1960.
G. Blassé, Crystallochemistry of Ferrospinels [Russian translation], Metallurgiya, Moscow (1968), p. 70.
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Translated from Poroshkovaya Metallurgiya, No. 7 (127), pp. 98–101, July, 1973.
Thanks are due to Dr. S. Makolagwa for valuable advice and discussion of results and to Mr. F. Foniok for helpful editorial comments.
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Kulikowski, J. Sintering of Ni-Zn ferrites in the presence of V2O5 . Powder Metall Met Ceram 12, 597–599 (1973). https://doi.org/10.1007/BF00796765
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DOI: https://doi.org/10.1007/BF00796765