Magnetic and Structural Properties of SrFe12−xCrxO19 (x = 0, 0.25, 0.5, 0.75, 1) Hexaferrite Powders Obtained by Sol–Gel Auto-Combustion Method

Roohani, Ebrahim; Arabi, Hadi; Sarhaddi, Reza; Shabani, Ameneh

doi:10.1007/s10948-017-4351-7

Cited by 7 publications

(1 citation statement)

References 25 publications

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“…It has been reported that Cr 3+ ions prefer to occupy 12k, 2a, and 4f 2 sites. The observed increase in the values of

M_{s}

and

M_{r}

(for x = 0.4) could be attributed to the fact that the number of Cr 3+ ions occupying 4f 2 site with spin up are more than those occupying 12k and 2a sites with spin down even though the magnetic moment of Cr 3+ ion (3

μ_{B}

) is less than that of Fe 3+ ion (5

μ_{B}

) . The values of

H_{c}

were found to be in the range 1639.35–4615.44 Oe,

H_{c}

greater than 1200 Oe are useful for high‐density perpendicular magnetic recording media .…”

Section: Resultsmentioning

confidence: 92%

Structural, Dielectric, and Magneto‐Optical Properties of Al‐Cr Substituted M‐Type Barium Hexaferrite

Trudel

Mohammed

Hafeez

et al. 2019

Physica Status Solidi (a)

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M‐type barium hexaferrite, BaFe12‐2xAlxCrxO19 (x = 0.0, 0.2, 0.4), is prepared using sol–gel auto‐combustion method and calcined at 1000 °C for 7 h. The effects of Al‐Cr substitution on the properties of the barium hexaferrite are investigated through XRD, FTIR, FESEM, UV‐vis‐NIR, VSM, and impedance analyzer. XRD analysis reveals the formation of hexaferrites with single phase and no impurity phase is detected. FTIR spectra show bands at 437 and 590 cm−1 which indicate the possible of hexaferrites. The micrographs of FESEM shows agglomerated grains with hexagonal plate‐like shape while the EDX spectra confirm the composition of the synthesized samples. Dielectric constant decreases abruptly at lower frequencies and an increment in dielectric constant at much higher frequency region is observed. Grain boundaries dominate the AC conductivity at lower frequencies while the grains could be responsible for the observed dispersion at higher frequencies. The values of coercivity for all the samples are found to be greater than 1200 Oe; this makes the prepared samples useful for high‐density perpendicular magnetic recording media.

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“…It has been reported that Cr 3+ ions prefer to occupy 12k, 2a, and 4f 2 sites. The observed increase in the values of