论文部分内容阅读
Al-substituted barium ferrite powders were synthesized using the sol-gel auto-combustion method according to the molecular formula BaAl_xFe_(12-x)O_(19)(x=0,0.1,0.2,0.3,0.4,0.5,1.0).Compared with non-substituted barium ferrite anneal- ing at 1000℃,the vibrating sample magnetometer (VSM) measurement manifested that the optimum magnetic properties formation temperature of Al-substituted barium ferrite was 1100℃.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 V_(cell).Magnetic measurement of non-substituted and Al-substituted powders annealed from 900℃to 1200℃exhibited that the maximum magnetization M (10 kOe),the remanent magnetization M_r and the coercivity H_c depended strongly on the chemical composition of powder as well as the annealing temperature.When annealing at 1100℃,BaAl_(0.5)Fe_(11.5)O_(19) of high coercivity H_c (6584 Oe) was produced.Meanwhile,M (10 kOe) and M_r were 42.83 emu/g and 25.65 emu/g,respectively.
Al-substituted barium ferrite powders were synthesized using the sol-gel auto-combustion method according to the molecular formula BaAl_xFe_ (12-x) O_ (19) (x = 0,0.1,0.2,0.3,0.4,0.5,1.0). Compared with non-substituted barium ferrite anneal- 1000 ° C, the vibrating sample magnetometer (VSM) measurement manifested that the optimum magnetic properties formation temperature of Al-substituted barium ferrite was 1100 ° C. 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 V_ (cell) .Magnetic measurement of non-substituted and Al-substituted powders annealed from 900 ° C to 1200 ° C showed that the maximum magnetization M (10 kOe), the remanent magnetization M_r and the coercivity H_c depended strongly on the chemical composition of the powder as well as the annealing temperature .When annealed at 1100 ° C, BaAl_ (0.5) Fe_ (11.5) O_ (19) of high coercivity H_c (6584 Oe) was produced.Meanwhile, M (10 kOe) and M_r were 4 2.83 emu / g and 25.65 emu / g, respectively.