Cr-doped hexagonal ferrites, with chemical composion Sr
0.35Ca
0.30La
0.35Fe
12.00−xCr
xO
19 (where 0.00 ≤
x ≤ 1.05), were synthesized using the traditional ceramic route. An X-ray diffractometer (XRD) and a vibrating sample magnetometer were used to characterize the phase composition and magnetic properties of the magnetic powders, respectively. The XRD data show that when the Cr content (
x) ≤ 0.60, non-magnetic phase, α-Fe
2O
3, is obviously observed. When the Cr content (
x) ≥ 0.60, the diffraction patterns demonstate that the magnetic powders show the magnetoplumite structure, and only a small trace of α-Fe
2O
3 is observed. The saturation magnetization linearly decreases with the increase of Cr content (
x) from 0.00 to 1.05, while the remanent magnetization first increases with Cr content (
x) from 0.00 to 0.45, and then keeps constant with Cr content (
x) form 0.45 to 0.75, and decreases when Cr content (
x) ≥ 0.75. The coercivity initially enhances significantly with the increasing of Cr content (
x) until it reaches to the maximum value of 3925 Oe at Cr content (
x) = 0.60, and then decreases slowly when Cr content (
x) ≥ 0.60.
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