Crystal structure of Ga_0.47(1)Sb_0.53(1)Pd₂

Abstract

Ga 0.47(1) Sb 0.53(1) Pd 2 , hexagonal, P62m (no. 189), a = 7.0374(3) Å, c = 3.3194(2) Å, V = 142.37(2) Å 3 , Z = 3, R p = 0.0269, R wp = 0.0417, T = 295 K. CSD no.: 433695 Source of materialsGa 0.47(1) Sb 0.53(1) Pd 2 was synthesized from elemental palladium (granules, ChemPur, 99.95%), gallium (pellets, ChemPur,

The ternary systems Al–Ga–Pd and Ga–Sb–Pd. Search for new catalytic materials

“…All the binary phases, except Ga 3 Pd 5 , show significant solubility of the third component at a constant concentration of Pd at 500°C (the highest solubility, up to 8 at.% Sb, was found for GaPd 2 ). Three new ternary phases were revealed in the Pd-rich part of the phase diagram: Ga 1-x Sb x Pd 2 with x = 0.5-0.7 (Fe 2 P-type structure, space group P-62m, Pearson symbol hP9) [32] and two tetragonal phases with primitive unit cells and approximate compositions close to Ga 0.5 Sb 0.5 Pd 3 , one of which crystallizes in a Pt 3 Ga-type structure (space group P4/mbm, Pearson symbol tP16) [33]. According to an in situ temperature-dependent XRPD study (25-750°C) on as cast samples, the tetragonal phase with Pt 3 Ga-type structure exists till 600°C, whereas the other phase is stable till 700°C ( Fig.…”