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Preparation of NiFe2O4 powder by spray pyrolysis of nitrate aerosols in NH3

Published online by Cambridge University Press:  31 January 2011

Hsuan-Fu Yu  and
Ahmed M. Gadalla
Hsuan-Fu Yu
Affiliation:
Chemical Engineering Department, Tamkang University, Taipei Hsien, Taiwan 25137, Republic of China
Ahmed M. Gadalla*
Affiliation:
Chemical Engineering Department, Texas A/M University, College Station, Texas 77843
*
a) Deceased.
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Abstract

To avoid the formation of hollow spheres during spray pyrolysis, NH3 was employed to change the mechanism of forming NiFe2O4 from aerosols, containing Ni(II) and Fe(III) nitrates in the required stoichiometric ratio. Nearly spherical, solid submicron NiFe2O4 particles with narrow size distribution were produced in one step using a dilute aqueous solution at pyrolysis temperatures as low as 823 K. However, higher pyrolysis temperatures (≥1023 K) reduced the oxides to metallic alloy of Ni and Fe due to dissociation of NH3. The forming steps and possible reaction mechanisms for aerosol droplets involved in the process were discussed.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 3 , March 1996 , pp. 663 - 670
Copyright
Copyright © Materials Research Society 1996

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References

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