Er-Cr-Ge ternary system

Abstract

The isothermal section of the phase diagram of the Er–Cr–Ge ternary system was constructed at 1070 K over the whole concentration range using X-ray diffractometry, metallography and electron microprobe analysis (EPMA). At the temperature of investigation the interaction of components in the Er–Cr–Ge system is characterized by the formation of two ternary compounds: ErCr6Ge6 (MgFe6Ge6-type, space group P6/mmm, Pearson symbol hP13; a = 5.15149(3), c = 8.26250(7) Ǻ; RBragg = 0.0493, RF = 0.0574) and ErCr1-xGe2 (CeNiSi2-type, space group Cmcm, Pearson symbol oS16, a = 4.10271(5), b = 15.6652(1), c = 3.99017(4) Ǻ; RBragg = 0.0473, RF = 0.0433). For the ErCr1-xGe2 compound, the homogeneity region was determined (ErCr0.28-0.38Ge2, a = 4.10271 (5)-4.1418 (9), b = 15.6652 (1)-15.7581(4), c = 3.99017 (4)-3.9291(1) Ǻ).

Keywords

• інтерметаліди
• потрійна система
• фазові рівноваги
• тверді розчини