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R. Sato Turtelli, J.P. Sinnecker, A. Penton-Madrigal, R. Grössinger, I. Skorvánek, T. Krenicky, E. Estévez-Rams:
"An unusual temperature dependence of the coercive field in the melt-spun Fe_80-xSi₂₀Nb_x (x=12,20)";
Journal of Magnetism and Magnetic Materials, 304 (2006), S. e690 - e692.

An unusual temperature dependence of the coercive field in the melt-spun Fe_80-xSi₂₀Nb_x (x=12,20)

Reiko Sato Turtelli a, João Paulo Sinnecker b, Arbelio Penton-Madrigal c, Roland Grössinger a, Ivan Skorvánek d, Tibor Krenicky d and Ernesto Estevez-Rams c

a Inst. f. Festkörperphysik, Tech. Univ. Wien, Wiedner Hauptstrasse 8, Vienna, Austria
b Inst. Fsica, Univ. Federal de Rio de Janeiro, C. P. 68528, R.J. 21945-970, Brasil
c Facultad de Fisica-IMRE, Univ. de la Habana, San Lazaro y L., CP 10400. C. Habana, Cuba
d Institute of Exp. Physics, Slovak Acad. Sci., Watsonova 47, SK-043 Kosice, Slovakia

Abstract

The coercive field of the as-cast Fe₆₈Si₂₀Nb₁₂ and Fe₆₀Si₂₀Nb₂₀ ribbons decreases with increasing temperature abruptly up to 35 K, then slowly up to around 200 K. Above this temperature the coercive field increases. Qualitatively this is attributed to the point that this unusual coercive field curve behavior is related mainly to the nano-crystalline material containing two nanocrystalline phases (BCC Fe-Si and hexagonal NbFe_2-ySi_y), where exchange interactions among these small particles occur. The fraction of the hexagonal phase increases with increasing Nb and after annealing decomposes in two hexagonal phases with similar composition. For the Fe₆₀Si₂₀Nb₂₀ alloy the quantity of NbFe_2-ySi_y nanocrystallites is almost the same of that BCC Fe-Si particles.

Keywords: Fe-Si alloys; Nanocrystalline particles; Coercivity; Intergranular interactions

Fe-Si alloys; Nanocrystalline particles; Coercivity; Intergranular interactions

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588064

http://dx.doi.org/10.1016/j.jmmm.2006.02.172