Erbium dicobalt disilicide, ErCo₂Si₂

Single crystals of erbium dicobalt disilicide were synthesized from the corresponding elements by arc melting. The ternary intermetallic compound crystallizes in the body-centred tetragonal space group I4/mmm and adopts the CeGa₂Al₂ structure type, with all atoms in special positions.

Erbium nickel tris­ilicide, ErNiSi₃

Single crystals of ErNiSi₃ were synthesized from the corresponding elements by arc melting. The ternary inter­metallic compound crystallizes in the ortho­rhom­bic space group Cmmm and adopts the SmNiGe₃ structure type, with all atoms in special positions of site symmetry m2m.

Trierbium nickel trialuminium digermanide, Er₃NiAl₃Ge₂

Single crystals of Er₃NiAl₃Ge₂ were synthesized from the corresponding elements by arc-melting. The new quaternary inter­metallic compound crystallizes in the primitive hexa­gonal space group P2m and adopts the Y₃NiAl₃Ge₂ structure type [Zhao & Parthé (1990). Acta Cryst. C46, 2273-2276], with all atoms in special positions: Er and Al with site symmetry m2m, Ni with site symmetry 2m, and Ge with .. site symmetry.