The Fe−Ho binary system
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The Fe−Ho phase diagram was determined on the basis of data obtained by X-ray diffraction, metallographic and differential thermal analysis techniques. Since emphasis was centered in the region where intermetallic compounds predominate, neither the iron nor holmium terminal regions were included in this study. Eutectic reactions were found to occur at 16.5 wt pct Fe and 875° C, 61 wt pct Fe and 1284° C, and 79 wt pct Fe and 1338° C. The congruent melting points of the compounds Ho6Fe23 and Ho2Fe17 were found to be 1332° and 1343° C, respectively. Two other intermetallic compounds were found, HoFe2 and HoFe3, and had peritectic decomposition temperatures of 1288° and 1293° C, respectively.
KeywordsHolmium HoFe3 Tantalum Foil Congruent Melting Point Differential Thermal Analysis Technique
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