Effect of Zn2+-Zr4+ co-substitution on structural, magnetic and dielectric properties of Ba0.5Ca0.5ZnxZrxFe12−2xO19 hexaferrite

Sachin Kumar Godara, Sher Singh Meena*, Rohit Jasrotia*, Jyoti Prakash, Ankit Verma, Ranjit Singh, A. K. Srivastava, Mandeep Singh, Pradip K. Maji, Ankit Jain, Ashwani Kumar Sood, Jahangeer Ahmed, Saad M. Alshehri, Amir Mehtab, Tokeer Ahmad, Aslam Hossain, Abhishek Kandwal

*Corresponding author for this work

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12 Citations (Scopus)

Abstract

In present study, M-type hexaferrite, Ba0.5Ca0.5ZnxZrxFe12−2xO19 (x = 0.00–1.00 with increment of 0.2 per step) were fabricated by the conventional sol-gel technique. The powder X-ray diffraction (PXRD) patterns certified the exchange of Fe3+ ions by Zn2+-Zr4+ ions. Both the lattice parameters ‘a’ and ‘c’ have raised from 5.885 (x = 0.00) to 5.926 Å (x = 1.0), and from 23.091 (x = 0.00) to 23.455 Å (x = 1.00), respectively. FESEM micrographs display a slight drop in the size of grains with doping. The maximum saturation magnetization (MS ≈73.31 emu/g) was detected for x = 0.2 configuration, that is larger than observed value of MS of 72.0 emu/g for pure barium hexaferrite material. The value of coercivity (HC) declines significantly from 2151 to 161 Oe with the increase of Zn2+-Zr4+ doping. Mössbauer spectra have been recorded to determine the preferential site occupancy by Zn2+-Zr4+ dopant ions and also the ionic state of Fe-ions. A Mössbauer spectrum shows a doublet and five sextets. All components are in a high spin state as a result of the Fe3+ ions. The magnetically hard material is converted into a magnetically soft one with the incorporation of Zn2+-Zr4+ dopants. The decreasing trend in Ms is also verified by the Mössbauer results. With Zn2+-Zr4+ co-substitution, the average values of hyperfine field (Hf) decrease from 46.5 (x = 0.0) to 36.9 T (x = 1.0), whereas the comparative size of paramagnetic doublet is increased from 0.5 (x = 0.00) to 12.6% (x = 1.00). These samples have superior saturation magnetization (45.42–71.50 emu/g) and coercivity (161–2151 Oe) with substitution, which can be vital for both low- and high-density magnetic recording media applications. From the dielectric measurements of Ba0.5Ca0.5ZnxZrxFe12−2xO19 (x = 0.0–1.0) hexaferrites, it was observed that the dielectric constant was improved as the Zn2+-Zr4+ co-substitution increased up to x = 0.80. After that, it started to go down for x = 0.20. In addition, the dielectric study suggests dielectric loss (tan δ) capability within the prepared hexaferrites which makes them also suitable for the EMI shielding application.

Original languageEnglish
Article number1195
JournalJournal of Materials Science: Materials in Electronics
Volume34
Issue number15
DOIs
Publication statusPublished - May 2023
Externally publishedYes

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