期刊
PHYSICA B-CONDENSED MATTER
卷 666, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.physb.2023.415134
关键词
Strontium hexaferrite; Microwave sintering; (BH)(max); Magnetic anisotropy; Hardness constant; Permanent magnet
Al-substituted strontium hexaferrite (SrFe12-xAlxO19) was synthesized by the sol-gel auto-combustion method and microwave sintering at 1100 degrees C. The XRD patterns showed hexagonal crystal symmetry with P6(3)/mmc space group. Lattice contraction was observed with increasing Al3+ concentration in SrFe12-xAlxO19. The anisotropy field was found to be approximately 25 kOe for SrFe11.5Al0.5O19. The (BH)(max) of 1.20 MGOe was obtained for x = 0.0, while there was a 63.66% enhancement of coercivity for SrFe11.5Al0.5O19 at 300 K. However, the highest (BH)(max) of 1.84 MGOe was achieved at 60 K for SrFe11.5Al0.5O19. The hardness parameter analysis confirmed that all the samples met the criterion for a permanent magnet, with (BH)max in the range of (1.00-1.20) MGOe at 300 K.
Al-substituted strontium hexaferrite (SrFe12-xAlxO19) has been synthesized by the sol-gel auto-combustion method, followed by microwave sintering at 1100 degrees C. The Rietveld refinement of XRD patterns reveals the hexagonal crystal symmetry with P6(3)/mmc space group. Lattice contraction has been observed with the increasing Al3+ concentration in SrFe12-xAlxO19. The anisotropy field is found to be similar to 25 kOe for SrFe11.5Al0.5O19. The (BH)(max) (maximum energy product) of 1.20 MGOe is obtained for x = 0.0 whereas there is a 63.66% enhancement of coercivity for SrFe11.5Al0.5O19 at 300 K. However, the highest (BH)(max) of 1.84 MGOe has been achieved at 60 K for SrFe11.5Al0.5O19. The criterion for a permanent magnet is satisfied by analyzing the hardness parameter. All the samples are found to be magnetically hard with (BH) max in the range (1.00-1.20) MGOe at 300 K.
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