Investigation on structural and microwave absorption property of Co2+ and Y3+ substituted M-type Ba-Sr hexagonal ferrites prepared by a ceramic method
Introduction
The exponential growth in information technology or wireless devices has produced wireless or electromagnetic pollution. The electromagnetic interference (EMI), caused by electromagnetic pollution, results in the malfunctioning of electronic devices and it is potentially harmful for biological systems. The microwave absorbers or EMI suppressors are used to remove or attenuate this EMI or stray electromagnetic signals.
Ferrites are incorporated in electrical, electronic and wireless applications such as wideband transformers, antenna, channel filters, gyromagnetic devices, radar absorbing materials (RAM) etc. [1], [2], [3], [4]. Their good dielectric and magnetic properties render them better EMI suppressers than conventional dielectric materials. M-type hexaferrites are ferrimagnetic by nature and used as microwave absorbers or EMI reduction owing to large dielectric and magnetic losses, domain wall resonance and ferromagnetic resonance (FMR) [5], [6]. The various researchers have investigated microwave absorption properties of M-type substituted hexagonal ferrites [7], [8], [9], [10].
In the present paper, we report microwave absorption property of Co2+ and Y3+ ions substituted M-type Ba0.5Sr0.5CoxYxFe12−2xO19 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) hexagonal ferrites prepared by a standard ceramic method and elucidated the absorption with quarter wavelength mechanism and impedance matching mechanism; a few researchers have reported the research work based on these two mechanisms.
Section snippets
Experimental method
M-type hexagonal ferrites with chemical composition Ba0.5Sr0.5CoxYxFe12−2xO19 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were prepared by a standard ceramic method [11]. AR grade of Barium carbonate (BaCO3, 99.98% pure, Merck, Germany), Strontium carbonate (SrCO3, 99.99% pure, Sigma-Aldrich), Cobalt carbonate (CoCO3, 99.99% pure, Sigma-Aldrich), Yttrium oxide (Y2O3, 99.99% pure, Sigma-Aldrich) and Ferric oxide (Fe2O3, 99.99% pure, Merck, Germany) were chosen as starting materials. The stoichiometric
XRD analysis
The structural properties and phase purity of the sintered polycrystalline samples were investigated at room temperature using X-ray diffraction technique. Fig. 2 represents X-ray diffraction patterns of Ba0.5Sr0.5CoxYxFe(12−2x) (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) hexagonal ferrite samples, prepared using a standard ceramic method sintered at 1150 °C for 15 h. All the observed peaks in XRD were indexed using the Powder X software and identified with their Millar indices. The observed peaks
Conclusions
The experimental observations are summarised as follows:
- 1
Ba0.5Sr0.5CoxYxFe12-2xO19 (x = 0.0 to 1.0) hexagonal ferrite powders have been successfully synthesized using a standard ceramic method. XRD analysis of undoped and x = 0.2 compositions confirms formation of M-type phase having hexagonal crystal structure, while x = 0.4 to 1.0 composites are consist of two phases; M-type as major phase, hexagonal and BaFe2O4 as minor phase, spinel.
- 2
In doped compositions, the microwave absorption property is
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Effects of Y–Co co-substitution on the structural and magnetic properties of M-type strontium hexaferrites
2021, Ceramics InternationalCitation Excerpt :In recent years, numerous researchers have attempted to improve the properties of SrM hexaferrites by co-substituting Sr2+ and Fe3+ with other metal ions, such as La-Zn [18], Nd-Co [19], La-Cu [20], La-Co [21], Gd-Sn [22], Ce-Mn [23], Dy-Co [24], and Ca–Al [25]. J. Singh et al. studied the influence of Co2+ and Y3+ co-substitution on the structural and microwave absorption properties of Ba–Sr M-type hexaferrites, discovering that by increasing the substitution amount, the microwave absorption performance was enhanced [26]. However, to the best of our knowledge, the influence of Y–Co co-substitution on the properties of SrM hexaferrites has not been thoroughly explored to the present date.