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Densification, grain growth, magnetic and dielectric properties of sintered Li–Zn ferrite (Li 0.3 Zn 0.4 Fe 2.3 O 4 ) doped with nano silicon dioxide (10 nm) were investigated. The density and microstructural results revealed that increasing the nano-SiO 2  content resulted in lower density and higher porosity at sintering temperatures below 1 000 °C, whereas at higher temperatures, this led to higher density and grain growth. In addition, nano-SiO 2  content greater than 2 wt.% resulted in more reduction in porosity and had no effect on grain growth. Moreover, the highest density and the maximum induction ( B  s  = 380 mT) were obtained for the sample containing 2 wt.% nano-SiO 2  and sintered at 1 100 °C for 1.5 h, in comparison with undoped samples. Furthermore, the variation of magneto-dielectric properties as a function of frequency were explained according to Koop's theory and electron hopping between the Fe + 2  and Fe + 3  ions.

The effect of nano-SiO 2 on magnetic and dielectric properties of Li–Zn ferrite