Impact of Zn2+-Zr4+ substitution on M-type Barium Strontium Hexaferrite’s structural, surface morphology, dielectric and magnetic properties

[Display omitted] •XRD Rietveld refinement data indicates all the samples were phase pure.•Raman peak broadening indicates local straining in crystal lattice with substitution.•Grain size increases with Zn2+/Zr4+ substitution upto x = 0.40.•Maximum value of Ms is 67.37 emu/g in x = 0.4 sample.•Hc mo...

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Published in:Results in physics 2021-03, Vol.22, p.103892, Article 103892
Main Authors: Godara, Sachin Kumar, Kaur, Varinder, Chuchra, Kirti, Narang, S.B., Singh, Gurpreet, singh, Mandeep, chawla, Aanchal, Verma, Swati, Bhadu, Gopala Ram, Chaudhari, Jayesh C., Babu, P.D., Sood, Ashwani Kumar
Format: Article
Language:English
Subjects:
Barium Strontium Hexaferrite
Coercivity
Magnetic recording
Raman
Rietveld refinement
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Summary:[Display omitted] •XRD Rietveld refinement data indicates all the samples were phase pure.•Raman peak broadening indicates local straining in crystal lattice with substitution.•Grain size increases with Zn2+/Zr4+ substitution upto x = 0.40.•Maximum value of Ms is 67.37 emu/g in x = 0.4 sample.•Hc monotonically decreases from 4936 to 1029 Oe with Zn2+/Zr4+ substitution. We report the synthesis of Ba0.5Sr0.5ZnxZrxFe12-2xO19 (x = 0.00–1.00) samples using sol–gel auto combustion method. The Rietveld refinement of XRD data indicates a) pure phase formation, b) increase in lattice parameters with composition and c) the absence of undesirable phases such as α–Fe2O3, BaCO3 and SrCO3. FESEM and TEM micrographs reveal an increase in grain size with ‘x’. The broadening of Raman peaks without any peak shift in all the samples indicates that the Zn2+/Zr4+ions are incorporated into Ba0.5Sr0.5Fe12O19 without altering the local structure. Magnetic measurements reveal that the maximum value of saturation magnetization (Ms) is 67.37 emu/g in x = 0.4 sample. The coercivity (Hc) monotonically decreases from 4.936 KOe to 1.029 KOe with increasing concentration of non-magnetic dopants. The dielectric constant values decreases monotonically as function of frequency for all the samples. The samples because of their superior magnetic properties could be vital for high density perpendicular recording, high density parallel recording EM shielding and permanent magnet applications.
ISSN:2211-3797
2211-3797
DOI:10.1016/j.rinp.2021.103892