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BaTiO 3 - Ag composite nanopowders were synthesized via microemulsion mediated synthesis through the hydrolytic decomposition of mixed metal alkoxide solutions as precursor for the BaTiO 3 and the reduction of silver nitrate in the presence of polyvinylpyrrolidone (PVP) as source for the Ag nanoparticles. The X-ray diffraction (XRD) patterns indicate that BaTiO 3 and Ag phases were successfully synthesized in the composite powders. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that the synthesized BaTiO 3 nanoparticles were aggregates of nanosized primary particles as small as 10 nm in diam- eter and the average particle size of nanocrystalline Ag was about 100 nm. Calcination and sintering studies reveal that there exists a difference in the sintering behaviour of BaTiO 3 and Ag in the composite nanopowders. Thermogravimetric analysis (TGA) shows weight losses due to the burnout of organic residues arising from the synthesis, the release of water from the surface and separation of hydroxyl ions from the lattice of BaTiO 3 nanoparticles. A dilatometric study of BaTiO 3 -Ag composite confi rmed a strong difference in the shrinkage behaviour compared to that of the pure BaTiO 3 obtained by microemulsion mediated synthesis.

Microemulsion mediated synthesis of BaTi03-Ag nanocomposites