Abstract
Manganese ferrite spinel has been synthesized by using low grade manganese ore and ferric oxide as sources of manganese oxide and iron oxide through solid state reaction route by taking manganese and iron mole ratio of 1:2 respectively. The impact of sintering temperature on phase composition and particle size is investigated. Similarly, the impact of frequency on dielectric constant, dielectric loss, AC (alternating current) conductivity and tangent losses is also investigated. The results shows the presence of spinel structure manganese ferrite (MnFe2O4) as the major phase for the sample sintered at 1200 °C. It has been established that the crystallite size increase with rise in sintering temperature. The surface morphology of the sample sintered at 1200 °C show pyramidal and triangular shape grains. The dielectric constant (εʹ) and dielectric losses (εʹʹ) were observed to decrease with increasing the sintering temperature and frequency. Furthermore, the AC (alternating current) conductivity was found to rise with rise in applied frequency. On the other hand, the tangent losses falls considerably with rise in applied frequency.
Highlights
Manganese ferrite spinel has been synthesized by using low grade manganese ore and ferric oxide as sources of manganese oxide and iron oxide through solid state reaction route by taking manganese and iron mole ratio of 1:2 respectively
This paper reports the synthesis of manganese ferrite via solid state reaction route
It has been observed that particles size of the synthesized nanoparticles increases with increasing the sintering temperature (Table 1) which accounts for best conductivity of the material at high temperatures while manganese ferrite phase becomes more relevant at high temperature i.e. 1200 °C
Summary
Manganese ferrite spinel has been synthesized by using low grade manganese ore and ferric oxide as sources of manganese oxide and iron oxide through solid state reaction route by taking manganese and iron mole ratio of 1:2 respectively. The impact of sintering temperature on phase composition and particle size is investigated. The dielectric constant (ε) and dielectric losses (εʹ) were observed to decrease with increasing the sintering temperature and frequency. The M nFe2O4 is a soft magnetic semi conducting material characterized by low dielectric losses and high resistivity because of its dielectric n ature[2]. Trukhanov et al.[9] obtained hexaferrite nano particles by sol gel method with sintering temperature of 600–1100 °C and found that the average particle size and specific surface area of the obtained samples increases with increase in temperature. Kundu et al.[19] synthesized manganese ferrite nano particles through solid state reaction route using T i+4 ion as dopant and found that the particle diameter decreases with increasing the content of dopant (Ti+4). The particle size of manganese ferrite formed via this method, will always be in nanometer which have tolerance to high frequencies[21]
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