Influence of Si-Ca Oxide on Microstructure and Magnetic Properties of Calcined Sr_1-xLa_xFe_2n-xCo_xO_α

Abstract:

Calcined powders with the composition of Sr1-xLaxFe2n-xCoxOα (x=0-0.4) were investigated. The addition amount of Si or Ca oxide and combinations thereof were varied to analyze the effects on microstructure and magnetic properties of the calcined powders. It has been proved that there are interactions between the addition amount of Si-Ca oxide and La-Co oxide; what’s more, the right amount of Si-Ca additives can optimize the performance of the La-Co substituted calcined powders.

• Periodical: Advanced Materials Research (Volume 668)
• Pages: 745-748
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.668.745
• Online since: March 2013
• Authors: Yuan Zhou, Zhong Yan Chen, Fu Chen, Ze Kun Feng
• Keywords: Calcined Powders, Magnetic Property, Microstructure

References

[1] Shirk. B. T, Buessem. W. R. Temperature Dependence of Ms and K1 of BaFe12O19 and SrFe12O19 Single Crystals. . J Appl Phys, (1969), 40(3): 1294-1296.

[2] J. G. Rensen, J. S. van Wieringen, Anisotropic Mössbauer fraction and crystal structure of BaFe12O19. Solid State Communications. (1969), 7: 1139-1141.

DOI: 10.1016/0038-1098(69)90502-x

[3] A. Trautwein, E. Kreber, U. Gonser, Molecular orbital and mössbauer study of iron-oxygen compounds. J. Phys. Chem. Solids, (1975), 36: 325-328.

DOI: 10.1016/0022-3697(75)90031-1

[4] Taguchi. H, Minachi. Y, Masuzawa. K, et al. High performance SrLaCo ferrite magnets with M structure. ICF-8, Kyoto, Japan, (2000), 405-409. Kubota. Y.

[5] Takami . T, Ogata. Y, et al. La–Co substituted Sr ferrite magnets ICF-8, Kyoto, Japan, (2000), 410-412.

[6] Kools. F, Morel. A, Tenaud. P, et al. La–Co substituted Sr and Ba M-type ferrites magnet properties versus intrinsic and microstructural factors, ICF-8, Kyoto, Japan, (2000), 437-439.

[7] G. Asti, F. Bolzoni, J. M. Le Breton, et al. Magnetic anisotropy of LaCo-substituted SrFe12O19 ferrites. Journal of Magnetism and Magnetic Materials. (2004), 272–276.

DOI: 10.1016/j.jmmm.2003.12.1275

[8] Tsang. Tse Fang, J. B. Hwang, F. S. Shiau, The role of silica in sintering barium ferrite, Journal Of Materials Science Letters. (1989), 8: 1386-1388.

DOI: 10.1007/bf00720195

[9] J. Töpfer, S. Schwarzer, S. Senz, D. Hesse, Influence of SiO2 and CaO additions on the microstructure and magnetic properties of sintered Sr-hexaferrite, Journal of the European Ceramic Society, (2005), 25: 1681-1688.

DOI: 10.1016/j.jeurceramsoc.2004.06.003

[10] A. Morel, F. Kools, P. Tenaud, et al. Modeling of La-Co substituted M-type ferrite coercivity of Sr1-xLaxFe12-xCoxO19, ICF-8, Kyoto, Japan, (2000) , 434-436.

[11] F. Kools, A. Morel, R Grossinger, et al. LaCo-substituted ferrite magnets, a new class of high-grade ceramic magnets; intrinsic and microstructural aspects, J. Magn. Magn. Mater., (2002), 242–245: 1270–1276.

DOI: 10.1016/s0304-8853(01)00988-x

[12] F. Kools, solid State, (1985), 251-260.