| Autor: |
Grusková, A., Lipka, J., Sláma, J., Jančárik, V., Papánová, M., Štofka, M., González, A., Mendoza, G. |
| Zdroj: |
Icame 2005 (9783540498520); 2007, p1223-1230, 8p |
| Abstrakt: |
BaFe12−2xMxSnxO19 compounds, where M=Sn2+, Ni2+ or Zn2+ ions, were synthesized by mechanical milling and partially by citrate precursor methods. Analysis of magneto-crystalline structure has been carried out by Mössbauer spectroscopy. The Sn4+ ions replace Fe3+ ions on 2b and slightly on 2a+4f1 sites, Zn2+ ions strongly prefer 4f1 sites, Sn2+ ions prefer 4f1 sites too and Ni2+ ions occupy 4f2 and 12k or 2a sites. The magnetic properties were evaluated by the vibrating sample magnetometry and the thermomagnetic analysis. A large variation of the intrinsic coercivity Hc (330 to 78 kA/m) and of temperature coefficient of coercivity of ∆Hc/∆θ (0.39 to 0.22 kA/mδC) were achieved as a function of the (Zn-Sn) and (Sn-Sn) substitutions, respectively. The Curie temperature Tc decreased with the (Ni-Sn) substitution from 447 to 399°C. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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