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1995 dielectric properties, magnetic properties dielectric properties, magnetic properties D 9000 -017Formation, Structure and Magnetic Properties of (Er1-xYx)2Fe17C2.-Samples of the title series with 0 ≤ x ≤ 1.0 are prepared by melt spinning of arc-melted (Er1-xYx)2Fe17C2 alloys which have a two-phase structure consisting of rhombohedral Th2Zn17-type and predominant α-Fe phases. Melt spinning at 10-20m s-1 quenching rates results in a single phase Th2Zn17-type structure. Substitution of Y for Fe in Er2Fe17C2 causes small changes in the unit cell volumes and has a small influence on the Curie temperature. The saturation magnetization at 1.5 K increases with increasing Y concentration while the Fe magnetic moment remains almost constant as x increases from 0 to 1.0. A monotonic decrease in the spin reorientation temperature with increasing Y concentration is due to a decrease of the uniaxial anisotropy of the Er sublattice. - (SHEN, B.-G.; CAO, L.; GUO, H.-Q.; ZHANG, J.-X.; KONG, L.-S.; GONG, H.-Y.; CHENG, Z.-H.; J.