# Metal-Ceramic Composites: A Study Of Small Metal Particles (Divided Metals)

Subbanna, GN and Rao, CNR (1986) Metal-Ceramic Composites: A Study Of Small Metal Particles (Divided Metals). In: Materials Research Bulletin, 21 (12). pp. 1465-1471.

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## Abstract

Metal particles in $Pt-Al_2O_3$ and $Ni-Al_2O_3$ composites prepared by the reduction of the xerogels have been investigated by high resolution electron microscopy and x-ray diffraction. The alumina phase is essentially amorphous while the metal particles are crystalline. The average size of the metal particles increases with the metal content in the composites. Pt atoms exhibit a greater tendency to form metal clusters than the Ni atoms. At low metal concentrations ($\leq$0.25 wt%), the number of atoms in the metal particles is in the range 100–400. Lattice resolution of the metal particles has been observed in HREM images. The cubic phase of $ZrO_2$ is stabilized in $Ni-ZrO_2$ composites, the stability increasing with the Ni content.

Item Type: Journal Article Copyright to this article belongs to Elsevier Science Metal-Ceramic;Composites;Metal Particles;Divided Metals Division of Chemical Sciences > Materials Research CentreDivision of Chemical Sciences > Solid State & Structural Chemistry Unit 04 Jul 2008 19 Sep 2010 04:46 http://eprints.iisc.ernet.in/id/eprint/14795