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| Home > Publications database > Influence of sintering temperature on structural, electrical, dielectric, and magnetic properties of magnesium ferrite (MgFe2O4) ceramics prepared using powder derived via Sol-Gel auto-combustion |
| Home > Publications database > Influence of sintering temperature on structural, electrical, dielectric, and magnetic properties of magnesium ferrite (MgFe2O4) ceramics prepared using powder derived via Sol-Gel auto-combustion |
| Journal Article | IMPULSE-2024-00138 |
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2024
Springer Science + Business Media B.V
Dordrecht [u.a.]
Please use a persistent id in citations: doi:10.1007/s10971-024-06472-z
Abstract: Polycrystalline magnesium ferrite (MgFe2O4) ceramics were prepared using as-prepared MgFe2O4 powder derived via sol-gel auto combustion method, and the influence of sintering temperature on the structural, electrical, dielectric, and magnetic properties of bulk ceramics have been examined. Ceramic microstructure with increased grain size, crystallite size, and densification is found to improve with increasing sintering temperatures (1100 to 1200 °C/4 h). Sintering conditions (temp. and time) are optimized. The influence of grain and grain boundaries (GB’s) on electrical and dielectric properties is analysed over a wide frequency range of 0.1 Hz to 1 MHz. Ceramic sintered at 1200 °C/4 h exhibit low dc conductivity (σdc = 2.48 × 10−9 Ω−1cm−1) and a stable frequency independent dielectric constant ɛ´ ~ 15. DC conductivity determined from impedance Cole-Cole plot analysis is shown to be in close agreement with the dc conductivity estimated from ac conductivity analysis using Jonscher’s power law. Saturation magnetisation (MS) increases, and coercivity (HC) decreases with increase in sintering temperature. In comparison to powders, the large crystallite size (117 nm) in dense ceramics is indicative of a larger domain size with (MS = 38 emu/g), and the well-connected ceramic grains lead to a low coercive field (HC = 21 Oe).
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd)
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