Title of article :
SiO2-supported Pt particles studied by electron microscopy
Author/Authors :
D. Wang، نويسنده , , S. Penner، نويسنده , , D.S. Su، نويسنده , , G. Rupprechter، نويسنده , , K. Hayek and H. Hofmeister، نويسنده , , R. Schlogl ، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2003
Abstract :
Regularly grown Pt particles supported by amorphous SiO2 were heated in hydrogen at 873 K after an oxidising treatment. The morphological and structural changes were studied by electron microscopy. Platinum silicides Pt3Si with L12 (Cu3Au) structure, monoclinic Pt3Si and tetragonal Pt12Si5 were identified after the treatment. The mechanisms of coalescence of the particles and the formation of irregular large particles are suggested. A topotactic structural transformation accompanied with the migration of Si from the substrate to the particles are suggested to take place during Pt3Si formation.
Keywords :
Electron diffraction , Platinum silicide , High-resolution electron microscopy , Strong metal–support interaction
Journal title :
Materials Chemistry and Physics
Journal title :
Materials Chemistry and Physics
