Summary
A conventional thermogravimeter has been adapted with a small magnet to detect the Curie temperature, T C. The measurements were performed in several Fe(Ni)NbB alloys developed in a nanocrystalline form by mechanical alloying. The B addition favors a slight diminution (10-20°C), and the Ni addition the existence of three transitions related with bccFe, fcc(Fe-Ni) abd fccNi-rich environments. Furthermore, complementary analysis were performed by means of differential thermal analysis, scanning electron microscopy with energy dispersive X-ray microanalysis and by induced coupled plasma. Small contamination was found. A mass increase (about 1 mass%) was detected by thermogravimetry related to oxidation. Analysis allows us to state the inhomogeneity of the alloys obtained after 80 h of milling.
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Suñol, J., Gonzőlez, A., Escoda, L. et al. Curie temperature in Fe(Ni)Nb based mechanically alloyed materials. J Therm Anal Calorim 80, 257–261 (2005). https://doi.org/10.1007/s10973-005-0645-2
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DOI: https://doi.org/10.1007/s10973-005-0645-2