Abstract
A systematic investigation on the phase formation, magnetic, dielectric and impedance properties of strontium hexaferrites doped with Nd and Nd-Mg was performed. All ferrite samples were prepared by the citrate-precursor method and characterized with a combination ofX-ray diffraction, Vibrating sample magnetometer and impedance analyser. XRD analysis confirms the magnetoplumbite structure with space groupp63/mmcwithout any secondary phase. The lattice parameter ratioc/alies in the range of 3.92 to 3.94 and shows that the prepared material exhibits M-type hexagonal structure. An increase in coercivity and a decrease in magnetization were observed for all the samples. Large value of coercivity suggests that these materials are useful in longitudinal recording media. Further, it was found that the value of magnetocrystalline anisotropy constantK1decreases with the substitution of Nd and Nd-Mg. Measurement of dielectric loss and dielectric constant were performed as a function of temperature and frequency. Dielectric constant and ac conductivity of Sr0.95Nd0.05Mg0.05Fe11.95O19is more as compared to Sr0.95Nd0.05Fe12O19and SrFe12O19for all frequencies. The value of grain boundary resistance (Rgb) of Sr0.95Nd0.05Fe12O19is less as compared to SrFe12O19and Sr0.95Nd0.05Mg0.05Fe11.95O19and vice versa trend is observed in the value of capacitance of the grain boundary (Cgb) and in the values of relaxation time (τgb).
Highlights
Since last few decades, the hexaferrite with M-type structure have been the interest of continuous research due to their various remarkable properties [1, 2]
It is observed that the value of grain boundary resistance (Rgb) of Sr0.95Nd0.05Fe12O19is less as compared to SrFe12O19 andSr0.95Nd0.05Mg0.05Fe11.95O19and vice versa trend is observed in the value of capacitance of the grain boundary (Cgb) and in the values of relaxation time
The XRD patterns exhibits that the prepared material were single phase of M-type hexagonal ferrite
Summary
The hexaferrite with M-type structure have been the interest of continuous research due to their various remarkable properties [1, 2]. It is well established that method of preparation, sintering temperature, chemical concentration and even particle size can modify dielectric and magnetic properties of ferrites. Investigation of such properties at various chemical compositions, temperature and frequencies may provide reliable information about the nature of various physical processes. Accounting all the previous studies we have tried to elucidate the role of rare earth element in substituted M-type hexaferrite in enhancing various properties For this reason Nd and Nd-Mg strontium hexaferrite with single concentration (x = 0.05) was prepared in order to understand how the various properties vary with the substitution of rare earth and if an enhancement with respect to the parent compound. Silver paint was used as a conducting paste and was applied on both sides of the pellets to make them capacitors with the material as dielectric medium
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