Effects of Pr-Co content on the microstructural and magnetic properties of the Pr-Co substituted M-type strontium hexaferrites
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Pr-Co substituted M-type strontium hexaferrites with the chemical composition of Sr1-xPrxFe12-yCoyO19 (x = 0.00-0.50; y = 0.00-0.35) were prepared by the solid-state reaction method. Microstructures of the M-type hexaferrite samples were investigatedby the X-ray diffraction (XRD) and a field emission scanning electron microscopy (FE-SEM). The single-phase with hexagonalstructure is obtained in the M-type hexaferrites with Pr-Co content (0.00 ≤ x ≤ 0.20, 0.00 ≤ y ≤ 0.14). For the M-typehexaferrites with Pr-Co content (x ≥ 0.20, y ≥ 0.14), impurity phases are observed in the structure. The image of therepresentative magnet exhibits that the M-type hexagonal structure is formed in the magnet. A permanent magneticmeasuring system was used to measure the magnetic properties of the M-type hexaferrite magnets. The remanence (Br),maximum energy product [(BH)max] and Hk/Hcj ratios increase with the increasing substitution content of Pr (0.00 ≤ x ≤ 0.10)and Co (0.00 ≤ y ≤ 0.07), and then decrease with increasing substitution content of Pr (x ≥ 0.10) and Co (y ≥ 0.07). The intrinsiccoercivity (Hcj) and magnetic induction coercivity (Hcb) decrease with increaing Pr-Co content (0.00 ≤ x ≤ 0.30, 0.00 ≤ y ≤ 0.21),and then increase with increasing substitution content of Pr (x ≥ 0.30) and Co (y ≥ 0.21).
Abstract
Pr-Co substituted M-type strontium hexaferrites with the chemical composition of Sr1-xPrxFe12-yCoyO19 (x = 0.00-0.50; y = 0.00-0.35) were prepared by the solid-state reaction method. Microstructures of the M-type hexaferrite samples were investigatedby the X-ray diffraction (XRD) and a field emission scanning electron microscopy (FE-SEM). The single-phase with hexagonalstructure is obtained in the M-type hexaferrites with Pr-Co content (0.00 ≤ x ≤ 0.20, 0.00 ≤ y ≤ 0.14). For the M-typehexaferrites with Pr-Co content (x ≥ 0.20, y ≥ 0.14), impurity phases are observed in the structure. The image of therepresentative magnet exhibits that the M-type hexagonal structure is formed in the magnet. A permanent magneticmeasuring system was used to measure the magnetic properties of the M-type hexaferrite magnets. The remanence (Br),maximum energy product [(BH)max] and Hk/Hcj ratios increase with the increasing substitution content of Pr (0.00 ≤ x ≤ 0.10)and Co (0.00 ≤ y ≤ 0.07), and then decrease with increasing substitution content of Pr (x ≥ 0.10) and Co (y ≥ 0.07). The intrinsiccoercivity (Hcj) and magnetic induction coercivity (Hcb) decrease with increaing Pr-Co content (0.00 ≤ x ≤ 0.30, 0.00 ≤ y ≤ 0.21),and then increase with increasing substitution content of Pr (x ≥ 0.30) and Co (y ≥ 0.21).
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