Effect of Al-substitution on phase formation and magnetic properties of barium hexaferrite synthesized with sol-gel auto-combustion method

• Published in: Journal of Shanghai University Vol. 12; no. 3; pp. 216 - 220
• Main Author: 岳中岳 钟敏建 马洪良 郭广磊
• Format: Journal Article
• Language: English
• Published: Heidelberg Shanghai University Press 01.06.2008
• Subjects: Classical Mechanics; Engineering; Environment; Life Sciences; Materials Science; Mathematical and Computational Engineering; Mechatronics; 溶液凝胶自燃烧法; 磁性能; 钡铁氧体; magnetic properties; non-substituted barium ferrite; Al-substituted barium ferrite; sol-gel auto-combustion; 71.20.Eh; 75.75.+a
• ISSN: 1007-6417; 1863-236X
• DOI: 10.1007/s11741-008-0306-1

Al-substituted barium ferrite powders were synthesized using the sol-gel auto-combustion method according to the molecular formula BaAlxFe12-xO19 （x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 1.0）. Compared with non-substituted barium ferrite annealing at 1000 ℃, the vibrating sample magnetometer （VSM） measurement manifested that the optimum magnetic properties formation temperature of Al-substituted barium ferrite was 1 100 ℃. The data from X-ray diffractometer （XRD） showed that with increasing x, the lattice constants （a and c） decreased as well as the unit-cell volume Vcell. Magnetic measurement of non-substituted and Al-substituted powders annealed from 900 ℃ to 1 200 ℃ exhibited that the maximum magnetization M （10 kOe）, the remanent magnetization Mr and the coercivity Hc depended strongly on the chemical composition of powder as well as the annealing temperature. When annealing at 1 100 ℃, BaAl0.5Fe11.5O19 of high coercivity Hc （6584 Oe） was produced. Meanwhile, M （10 kOe） and Mr were 42.83 emu/g and 25.65 emu/g, respectively.