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The Phase Equilibria in the Er-Fe-Ti Ternary System at 1173 K
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DOI：10.1007/s11669-025-01223-1.png)
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Abstract
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The phase relationships in the Er-Fe-Ti ternary system at 1173 K have been investigated by means of x-ray diffraction and scanning electron microscopy. The presence of a new ternary compound ErFe9Ti2 was observed at the studied temperature. Another ternary compound, ErFe11Ti, was confirmed along with six binary compounds, namely ErFe11Ti, TiFe2, TiFe, Er2Fe17, Er6Fe23, ErFe3, and ErFe2. The solid solubility of Er in TiFe2 is 3.0 at.%, and that of Ti in Er2Fe17 is 5.5 at.%. ErFe11Ti and ErFe9Ti2 exhibit notable solid solubility ranges at 1173 K, with compositions varying approximately within ErFe11-xTi1+x (x = - 0.4 to 0.5) and ErFe9+xTi2-x (x = 0 to 0.2), respectively. Structural characterization of the ErFe9Ti2 compound showed that it crystallizes in the tetragonal P4/mbm space group. The ErFe9Ti2 phase exhibits lattice parameters of a = b = 0.82010(1) nm and c = 0.48026(5) nm.
Keywords:
crystal structure
Er-Fe-Ti system
phase diagram
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