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Two different hydrides of the C15 Laves phase intermetallic ErFe2 are considered. For ErFe2H3.es, X-ray analyses showed the presence of an expanded C15 cubic phase and a lower symmetry phase. The 57 Fe mean saturated hyperfine field is 20% larger than in ErFe2 and the 166 Er hyperfine field is 15% smaller. These results coupled with previous measurements of the net moment imply that the Er-Fe coupling is not antiparallel in this hydride. For ErFe2Hi t .i2, the only phase detected wasdoi:10.1051/jphyscol:1979270 fatcat:iletizboyrdxjokselos7f5hw4