کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1488550 | 1510725 | 2014 | 7 صفحه PDF | دانلود رایگان |
• Nano-sized grains of Co1.5Fe1.5O4 ferrite have been prepared.
• Structural, magnetic and dielectric properties have been studied.
• Material exhibited ferromagnetism and giant permittivity.
• Effect of interfacial heterogeneity has been demonstrated.
Co1.5Fe1.5O4 ferrite with nano-sized grains has been prepared by chemical reaction of metal nitrates at different pH values. XRD pattern has shown cubic spinel structure. The samples prepared at pH ∼11–12 showed ferromagnetism at room temperature, whereas the sample prepared at pH ∼9.5 has shown superparamagnetic feature. Samples have shown large electrical conductivity (10−2–10−4 S/cm), giant dielectric constant (104–107), and low dielectric loss (0.4–9). Magnetic and dielectric properties are strongly affected by the interfacial structure of nano-sized grains. To crosscheck the interfacial effects, magnetic properties of Co1.5Fe1.5O4 ferrite have been compared to that of a nano-composite, consisting of Co1.5Fe1.5O4 and non-magnetic NaNO3 particles. Cole–Cole plots of the complex dielectric spectra showed better insights of the interfacial effect in the samples.
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Journal: Materials Research Bulletin - Volume 50, February 2014, Pages 476–482