Hollow spheres of hexagonal ferrite BaCo2Fe16O27 were fabricated through a spray pyrolysis technique using co-precipitation ferrite powder precursor as materials, followed by calcinations in an air atmosphere. The phase composition, micro-morphology, and static magnetic property of the particles were measured by XRD, SEM, and VSM. The results indicate that the method for preparation of ferrite hollow microspheres (FHM) results in a broad particles size distribution. The density of FHM decreased from 5.31 g/cm3 to 2.31 g/cm3. When the heating rate was 5 ℃/min, and temperature was 1 200 ℃ for 4 hours, pure W-type ferrites were formed. With the heat treatment temperature and time increasing, the crystal structure becomes perfect, the saturation magnetization is increased and the coercive force is decreased.
参考文献
| [1] | Hatakeyama K;Inui T .Electromagnetic Wave Absorber Using Ferrite Absorbing Material Dispersed with Short Metal Fibers[J].IEEE Transactions on Magnetics,1984,20(05):1261-1263. |
| [2] | Matsumoto M.;Miyata Y. .Thin electromagnetic wave absorber for quasi-microwave band containing aligned thin magnetic metal particles[J].IEEE Transactions on Magnetics,1997(6):4459-4464. |
| [3] | Smit J;Wijn H P J.Ferrites[M].Eindhoven:Philips Technical Library,1959 |
| [4] | Wilcox D L;Berg M;Bernat T.Hollow and Solid Spheres and Microspheres-science and Technology Associated with Their Fabrication and Application[A].Pittsburgh,1995:372. |
| [5] | Caruso Frank .Hollow Capsule Processing through Colloidal Templating and Self-Assembly[J].Chemistry: A European journal,2000(3):413-419. |
| [6] | DIAZ R E;MILLER M C;LORE M M et al.High-performance Matched Absorber using Magnetodielectrics(e)[P].US 6146691,2000-11-14. |
| [7] | Iida M.;Watanabe M.;Sasaki T. .Titanium dioxide hollow microspheres with an extremely thin shell[J].Chemistry of Materials,1998(12):3780-3782. |
| [8] | Naskar MK.;Chatterjee M.;Lakshmi NS. .Sol-emulsion-gel synthesis of hollow mullite microspheres[J].Journal of Materials Science,2002(2):343-348. |
| [9] | Okubo M.;Minami H.;Konishi Y. .Production of hollow polymer particles by suspension polymerization[J].Colloid and polymer science,1998(7):638-642. |
| [10] | Rachel A.Caruso;Andrei Susha;Frank Caruso .Multilayered Titania, Silica, and Laponite Nanoparticle Coatings on Polystyrene Colloidal Templates and Resulting Inorganic Hollow Spheres[J].Chemistry of Materials,2001(2):400-409. |
| [11] | Caruso F;Caruso R A;Mohwald H .Nanoengineering of Inorganic and Hybrid Hollow Spheres by Colloidal Templating[J].Science,1998,282(06):4. |
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