fig. 1 shows the XRD patterns of melt-spun Co80ÿxZr18CrxB2(x = 0, 2, 3, and 4). The diffraction peaks of all the four samplescan be indexed as those of the single Co11Zr2 structure, in goodagreement with the report by Ivanova et al. [8]. In Fig. 2, we exhibitthe thermomagnetic curves of aforementioned samples. For eachsample, the curve presents only one magnetic transition that corresponds to Tc of Co11Zr2. This confirms that the as-spun Co80ÿxZr18-CrxB2 (x = 0, 2, 3, and 4) ribbons are magnetically single-phase. It istherefore concluded that the small addition of Cr does not alter thephase composition of Co80Zr18B2. On the other hand, we establishTcof Co11Zr2 for the sample with x = 0 to be 500 °C. The result
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