The intimate mixture of a skeletal gold structure with ZrO2 nanoparticles obtained simply by oxidation of Au(0.5)Zr(0.5) alloy at room temperature turns out to be an efficient catalyst for the selective oxidation of CO in the presence of hydrogen.
Abstract. The equilibrium phase diagram of the Ce-Zr-Au system was studied by differential thermal analysis, X-ray diffraction and electron probe microanalysis along the isopletic section at 50 at. % Au. Our main result concerns the discovery of a new ternary phase and a ternary invariant. The polymorphic transitions of the ZrAu phase, previously reported, was confirmed and we precised the melting and the polymorphic transition temperatures of the CeAu phase. A schematic representation of the isopletic section is given.
Structure
Structure D 2000Neutron Powder Diffraction Study of the Crystal Structures of ZrAu. -Two structural transitions are detected for the title compound in the temperature range 300-1273 K. ZrAu crystallizes in the triclinic space group P1 at room temperature and transforms to a monoclinic structure (space group P2/m) at about 670 K. Above 840 K, ZrAu adopts a tetragonal structure (P4/mmm) which is closely related to the A2-type structure. -(MOREAU, J. M.; ISA, M.; CHAOU, A. A.; LOMELLO-TAFIN, M.; JOURDAN, J.; GALEZ*, P.; VALMALETTE, J. C.; SOUBEYROUX, J. L.; J. Alloys
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