Effect of Dy3+ ions substitution on structural, electrical, and dielectric properties of SrDyxFe12-xO19 hexaferrite prepared by sol-gel combustion method

Journal of Electroceramics Pub Date: 2023-07-03 DOI: 10.1007/s10832-023-00320-2

Abstract
The substitution of Dy3+ ions in the M-type hexaferrite structure has been successfully synthesized by sol-gel combustion method according to the formula SrDyxFe12-xO19 (x = 0.0, 0.08, 0.16, 0.24, 0.32, and 0.40). The XRD analysis confirmed the formation of single-phase M-type hexagonal structures up to x = 0.24 compositions. The average crystallite size for the SrDyxFe12-xO19 samples ranges from 90.64 to 290.04 nm, whereas the value of the lattice parameters 'a' and 'c' vary from 5.8590 - 5.8879 ? and 22.9675 - 23.0761 ?, respectively. Scanning electron microscopy (SEM) was used for morphological analysis. Due to ceasing effect of polarization, the dielectric constant decreases in the higher frequencies. The SrDyxFe12-xO19 hexaferrites exhibit non-Debye type dielectric relaxation behavior confirmed by complex impedance spectroscopy (CIS) investigation. The SrDyxFe12-xO19 samples can be utilized as a promising material for various device applications due to a decrease in dielectric loss and an increase in dielectric constant with increasing Dy3+ ions concentration.
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