Synthesis, structure, and magnetic behavior of (LaxCe1−x)1.33Pt4Ga10 (0 ⩽ x ⩽ 1)

(LaxCe1−x)1.33Pt4Ga10 (0 ⩽ x ⩽ 1), synthesized with excess Ga flux, crystallize in the P63/mmc space group, Z = 1, with lattice parameters a = b ∼ 4.3 and c ∼ 16.5 Å for the entire range of the solid solution. Single-crystal diffraction and electron microscopy methods show that La substitution within the solid solution does not lead to systematic decrease in unit cell dimensions. The crystal structure of (LaxCe1−x)1.33Pt4Ga10 (0 ⩽ x ⩽ 1) can be viewed as a combination of RE2Ga3 (A) and double Pt2Ga4 (B) layers stacked along the c axis in an ABAB sequence. Ce1.33Pt4Ga10 exhibits a large negative Weiss constant, θW = −87.2 K, but does not reveal any signature of magnetic ordering. An examination of zero-field-cooled and field-cooled magnetization curves and AC susceptibility at low temperatures excludes a possible formation of spin-glass state down to 1.8 K. These findings support an earlier suggestion that Ce1.33Pt4Ga10 might exhibit non-Fermi liquid behavior.