Fully amorphous samples of the Pr₉Fe₆₀Co₁₃Zr₁Ti₃B₁₄ alloy were produced by the melt-spinning technique under an Ar atmosphere. In as-cast state the ribbon samples were soft magnetic with the coercivity field _JH_c of ~ 10 A/m and saturation magnetization J_r of ~1 T. Subsequent annealing at various temperatures T_a (from 923K to 973K for 10 min), resulted in evolution of the phase constitution together with significant change of their magnetic properties. X-ray diffractometry (XRD) revealed presence of the hard magnetic Pr₂(Fe,Co)₁₄B phase precipitated during annealing. However, the quantitative analysis of Mössbauer spectra, shown multiphase constitution of the alloy with relatively low volume fraction of this crystalline phase. Furthermore, the temperature dependences of the magnetization confirmed differences in constitution of the samples annealed at various temperatures. The room temperature measurements of the hysteresis loops indicated very good hard magnetic properties of annealed ribbons. The coercivity field increased from 28 kA/m to 1360 kA/m for the ribbons annealed respectively at 923K and 973 K.

The aim of present work was to determine correlations between the phase constitution and magnetic properties of ribbon samples.

Work supported by the research project No N N507 372 735 financed by Polish Ministry of Science and Higher Education in years: 2008-2011

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