Abstract
We have investigated the influence of surrounding atmospheres on crystallization of the as-quenched Fe-Ni-Zr ribbon prepared by a melt-spinning technique. The heat treatment of samples was carried out in various atmospheres � pure hydrogen, argon and ambient (air) atmosphere � and in vacuum (cca. 10^-2 Pa). Phase compositions of as-quenched and annealed states were studied by X-ray powder diffraction and Mossbauer spectroscopy. Temperature dependence of magnetic moments of samples was used for determination of critical temperatures of phase transitions. Temperature dependence of electrical resistivity was applied for determining the activation energy of crystallization. Kinetics of crystallization and final phase composition strongly depends on surrounding atmospheres used during heat treatments.

Key words
as-quenched material, kinetics of crystallization, Mossbauer spectroscopy, Xray powder diffraction

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