Isothermal Section of Er-Ag-Sn System at 873 K

The isothermal section of the Er-Ag-Sn system at 873 K was constructed with the use of scanning electron microscopy, energy-dispersive x-ray microanalysis and x-ray powder diffraction. Two ternary compounds were confirmed at this temperature: ErAgSn (LiGaGe structure type, P 6 3 mc , Z = 2, a = 4.6595(2) Å, c = 7.2872(3) Å) and non-stoichiometric phase ErAg 1−x Sn 2+x (Cu 3 Au structure type, Pm - 3m, Z = 1). For the last one homogeneity range was established (0.08 < x < 0.24) and lattice parameters were determined ( a = 4.5007(4), 4.5040(2), 4.5107(1), 4.5412(1) Å for the compositions Er 25.4 Ag 23.4 Sn 51.2 , Er 25.7 Ag 23.0 Sn 51.3 , Er 25.7 Ag 21.7 Sn 52.6 , Er 25.2 Ag 18.6 Sn 56.2 (at.%) respectively). Melting point of the phase Er 25.7 Ag 21.7 Sn 52.6 (at.%) was determined to be 1199 K by differential thermal analysis.