Abstract
Five new intermetallic phases of known structure types have been identified in a systematic study of the Ce–Ru–Ga system: CeRu0.90Ga1.10 (MgZn2 structure, sp. gr. Р63/mmc, а = 5.44503(5) A, с = 8.67188(13) A, very narrow homogeneity range), Ce7Ru6Ga7 (Pr7Co6Al7 structure, constant composition, sp. gr. Р4/mbm, а = 13.61910(17) A, с = 4.34957(5) A), Ce6Ru0.18Ga2.82 (K2UF6-derived structure, sp. gr. P $$\bar {6}$$ 2m, a = 8.09628(19) A, c = 4.38470(13) A), Ce23Ru10Ga (Pr23Ir7Mg4 structure, sp. gr. P63mc, а = 9.867(6) A, с = 22.153(14) A) and Ce26(Ru0.59Ga0.41)17 (Sm26(Co0.65Ga0.35)17 structure, sp. gr. P4/mbm, a = 11.9529(4) A, c = 15.0135(10) A). In the structures of Ce7Ru6Ga7, Ce23Ru10Ga, and Ce26(Ru0.59Ga0.41)17, some of the Ce atoms form very short Ce–Ru bonds (2.525(3), 2.549(5), and 2.506(2) A, respectively), which is attributable to their intermediate valence state.
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