Abstract
AbstractNickel-doped barium nanohexaferrites with the chemical formula BaNixFe(12-x)O19 are prepared using the chemical co-precipitation technique. The calcination of the samples is done at 800°C for 4 h. In order to carry out the structural analysis that includes the crystallographic and the morphological investigations, X-ray diffraction and TEM are carried out to govern the phase, structure and the size of the crystal. By the use of Debye–Scherrer equation, the size of the crystallite is calculated to be in the range of 38–100 nm. TEM results reveal the magnetoplumbite structure of the hexaferrites. The M–H curve obtained using the Vibrating Sample Magnetometer computes the magnetic parameters like saturation magnetization, coercivity, remanence and verifies the behaviour of hexaferrites as hard magnetic materials. Further, the effect of variation in calcination temperature is also investigated on the values of magnetic parameters of hexaferrites. In order to carry out the investigations on the electri...
Highlights
M-type barium nanohexaferrites and its doped nanocomposites are highly resistive ferrimagnetic compounds having iron as their main constituent (Valenzuela, 2012)
The diffused pattern in X-ray diffraction (XRD) results is related to the existence of haematite phase (Fe2O3) which can be associated with the results as reported by Mossbauer spectra in previous research (Ding et al, 1995)
It is found that a phase transition from amorphous to hexaferrite phase occurs at a temperature of 800°C and that there is an increase in the crystallite size as the calcination temperature is raised from 600 to 800°C
Summary
M-type barium nanohexaferrites and its doped nanocomposites are highly resistive ferrimagnetic compounds having iron as their main constituent (Valenzuela, 2012). These magnetically hard materials are broadly being explored by the researchers for their significant magnetic and electrical properties like large magneto-crystalline anisotropy, high coercivity, excellent corrosion resistance and chemical stability (Castro, Corrêa, Paulim Filho, Rivas Mercury, & Cabral, 2015; Ounnunkad, 2006; Wu & Yang, 2007). The M-type hexagonal ferrites cover a wide arena of technological applications Owing to their high resistivity and high permeability, these nanomaterials are used in permanent magnets, magneto optical devices, magnetic recording media and high-frequency microwave devices, especially in the development of microwave absorbers (Cho & Kim, 1999; Pullar, 2012). The effect of frequencies on the electrical behaviour offers much valued information about the charge carriers which in turn helps to explicate the mechanisms responsible for charge transport phenomena and its dielectric behaviour (Cernea et al, 2016)
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