Influence of PbO on microstructure and properties of a NiZn ferrite

Densification and microstructure development in PbO-doped NiZn ferrite have been studied with special emphasis on the effect of the PbO amount. Pure Ni 0.36Zn 0.64Fe 2O 4 ferrite powder requires a sintering temperature of about 1300 °C to achieve a density of 5 g/cm 3. A small amount of PbO added to...

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Bibliographic Details
Published in:Ceramics international 2003, Vol.29 (1), p.107-111
Main Authors: Rezlescu, N., Sachelarie, L., Rezlescu, E., Sava, C-L., Popa, P.D.
Format: Article
Language:English
Subjects:
Additives
B. Microstructure
C. Electrical properties
C. Magnetic properties
D. Ferrites
Densification
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Summary:Densification and microstructure development in PbO-doped NiZn ferrite have been studied with special emphasis on the effect of the PbO amount. Pure Ni 0.36Zn 0.64Fe 2O 4 ferrite powder requires a sintering temperature of about 1300 °C to achieve a density of 5 g/cm 3. A small amount of PbO added to the ferrite powder reduces its sintering temperature by about 200 °C, without degrading material properties. A sintered density of 4.9 g/cm 3 was achieved at 1100 °C with 1.2 wt.% PbO addition. Densification has been found to occur by liquid phase sintering. The PbO addition was also found to prevent exaggerated grain growth by hindering grain boundary motion.
ISSN:0272-8842
DOI:10.1016/S0272-8842(02)00080-9