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The isothermal section of the Ce–Cu–Zn phase diagram was constructed at 200 °C over the whole concentration range as a result of X-ray powder diffraction, wavelength dispersive spectrometry and electron probe microanalysis. The existence of one new ternary compound Ce2Cu5–5.7Zn2–1.3 was observed at this temperature and its crystal structure was refined from X-ray single crystal data (structure type Ce2Ni5Zn2, space group R 3 ¯ m , Pearson code hR18, a = 0.4998(1)–0.5078(1) nm, c = 3.6924(5)–3.6987(4) nm). The homogeneity regions were determined for a number of solid solutions on the basis of binary phases.

Investigations of the solid solution of CeCu 5− x Zn x composition (CaCu 5 structure type) are presented in this article. We refined the XPD patterns for the series of alloys of the CeCu 5 –CeZn 5 pseudobinary system. The crystal structure of this solid solution was determined by means of the single crystal and powder X-ray methods. Besides, the limit of the measured solid solution has been determined. WDS and EPMA were used for examining the number of phases and the phase content.

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 |).