Abstract
A natural garnet with excellent dielectric properties was mixed with different weight percentages of two spinel ferrites, Ni0.5Zn0.5Fe2O4 (NZO) and LiFe5O8 (LFO) to tailor its magnetodilectric properties. 3 wt% B2O3 was added to enhance the density of the composites. X-ray diffraction study revealed the decomposition of the mineral into hematite and cordierite and vibrational spectroscopic analysis confirmed the non-reactivity of decomposed mineral with spinel ferrites. Microstructural analysis shows well densified and almost tightly packed grains for garnet-Ni0.5Zn0.5Fe2O4 (G-N) and garnet-LiFe5O8 (G-L) composites. The optimised dielectric and magnetic properties of 0.5 G-0.5 NZO are εr = 4.1, μr = 1.8, tan δε = 0.02, tan δμ = 0.49, whereas that of 0.5 G–0.5 LFO are εr = 4.4, μr = 1.4, tan δε = 0.001, tan δμ = 0.05 at 1 GHz. Due to the moderate permittivity of garnet, a better impedance matching compared to magnetodielectric composites based on high-permittivity dielectric counterparts is observed. Hence, the present study indicates that G-N and G-L composites are potential candidates for sub-gigahertz wireless applications.
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