ИСТИНА

A novel ternary intermetallic compound Ce4Pt9Al13 was synthesized by arc-melting under argon from pure elemental components and then annealed in an evacuated quartz ampoule at 700 °C for 30 days. Its crystal structure was established via single- crystal X-ray diffraction with a Nonius Kappa CCD diffractometer (MoKa radiation ). Ce4Pt9Al13 crystallizes in the orthorhombic structure (space group Pmmn, unit cell parameters: a = 4.1826(1) Å, b = 11.4424(3) Å, c = 19.8475(5) Å). Powder X-ray diffraction data (STOE STADI P diffractometer, Cu Kα1 radiation) of Ce4Pt9Al13 are in a good agreement with the diffraction pattern calculated from X-ray single crystal data. The compound belongs to a new structure type and presents a site exchange variant of the Ho4Ir13Ge9 type. Pt and Al atoms form a three-dimensional framework with Pt-Al distances from 2.467 to 2.622 Å. Cerium atoms occupy large voids of the framework with distances to the nearest atoms of more than 3.19 Å.