Abstract
Ultrafine particles less than lum in diameter show a characteristic property originating from the size effect. For their effective industrial applications, ultrafine particles of a single crystal. having active crystallographic planes were produced by gas-evaporation technique.
Ultrafine particles of Ag and Pd were formed by controlling their particle size and crystal habit. The experiments of the sintering of these Ag particles showed a drastic lowering of a melting point: the sintering temperature of Ag of 30-150nm was 150-210°C. The smaller the particle size became, the lower the sintering temperature was obtained. When these ultrafine particles were applied for the conventional process of Ag and/or Ag-Pd thick film, the low resistivity of the film were obtained by forming a dense film. These experimental results are due to the effect of the surface activity of a ultrafine particle.
