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The crystal structure of new RTZn 2 intermetallic compounds (R = La, Ce, Tb; T = Co, Cu) was determined. The X-ray diffraction data showed that these compounds are isostructural to the new ternary compound ErCuCd 2 , which was found to crystallize with a superstructure of the ErCd 3 structure type (space group Cmcm, Pearson code oS16, a = 0.7097(1) nm, b = 1.0659(3) nm, c = 0.4471(1) nm, V = 0.3382(2) nm 3 , Z = 4). The obtained reliability factors are R F = 0.0240 and R W = 0.1127 for 235 unique reflections (|F 0 | > 4.00σ|F 0 |).

A new ternary compound LaCo 2.17 Zn 0.83 has been found during X-ray analysis of alloys in the La–Co–Zn system at 470 K. Single crystal measurements showed that this compound crystallised in the orthorhombic PrCo 2 Ga structure type (space group Pmma ). The refined structure parameters are a =5.038(1) A, b =4.047(1) A, c =7.124(2) A, V =145.3(1) A 3 , Z =8. The obtained reliability factor is R F =0.0316 for 292 independent reflections (| F 0 |>2 σ | F |).

The existence of the new ternary compound Tb 2 Co 2 Zn 15 has been found during an X-ray analysis of alloys in the Tb–Co–Zn system at 470 K. Single crystal measurements showed that this compound crystallised in the Ce 2 Al 2 Co 15 structure type (space group R3m ). The refined structure parameters are a =0.8984(5) nm, c =1.3150(4) nm, V =0.919(1) nm 3 , Z =3. The obtained reliability factor is R F =0.0494 for 245 independent reflections (| F o |>4.00 σ | F |).