Потрійна система Er-Cr-Ge

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: ErCr 6 Ge 6 (MgFe 6 Ge 6 -type, space group P 6/ mmm , Pearson symbol hP 13; a = 5.15149(3), c = 8.26250(7) Ǻ; R Bragg = 0.0493, R F = 0.0574) and ErCr 1- x Ge 2 (CeNiSi 2 -type, space group Cmcm , Pearson symbol oS 16, a = 4.10271(5), b = 15.6652(1), c = 3.99017(4) Ǻ; R Bragg = 0.0473, R F = 0.0433). For the ErCr 1- x Ge 2 compound, the homogeneity region was determined (ErCr 0.28-0.38 Ge 2 , a = 4.10271 (5)-4.1418 (9), b = 15.6652 (1)-15.7581(4), c = 3.99017 (4)-3.9291(1) Ǻ).