Sintering Behaviour and Properties of LiZn Ferrite Doped with PbO
✍ Scribed by Rezlescu, N. ;Sachelarie, L. ;Rezlescu, L. ;Rezlescu, E. ;Popa, P.D.
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 194 KB
- Volume
- 191
- Category
- Article
- ISSN
- 0031-8965
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✦ Synopsis
Lead oxide (PbO) has been investigated as sintering aid for Li 0.3 Zn 0.4 Fe 2.3 O 4 ferrite, prepared by conventional method, between 800 and 1100 C. Sintering experiments were carried out with various small amounts of PbO, between 0 and 4 wt%. Due to its low melting point, liquid bridges between grain boundaries appear and material transport assisted by liquid phase favors sinterability at lower temperatures. Dense sintered specimens (95% of theoretical density) were obtained using 1.2 wt% PbO at relatively low temperature of 1050 C, that is impossible without PbO. The densification behavior and physical properties of PbO-doped LiZn ferrite are closely related to microstructural changes caused by PbO. It was evidenced significant growth of grain sizes without compromising desirable material properties, except for electrical resistivity.