Research Opportunities for Materials with Ultrafine Microstructures (1989) / Chapter Skim
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Pages 74-76
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From page 74... ...
Furthermore, the high diffusivities combined with the short reaction distances, resulting from the small particle sizes and high density of nucleation sites in the interfaces of nanophase materials, might permit the formation of interfacial metastable or stable phases in the solid state at fairly low temperatures. In addition, nanophase processing of ultrafine powders opens up a variety of possibilities for producing new metastable phases in bulk form by reacting binary mixtures of nanocrystals of different elements at low temperatures.
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From page 75... ...
Under the same conditions, however, no Pd3Bi phase formation could be observed in evaporated thin-film samples , indicating again the increased diffusivities and reactivities in the nanocrystalline structure. The potential for nanophase materials processing shown by the low-temperature formation of Pd3Bi also offers a new method for the production of bulk metastable or stable compounds at low temperatures by interdiffusion starting from a binary mixture of
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From page 76... ...
. Cu and Er metal particles were produced simultaneously with the gascondensation method and deposited onto the surface of a rotating cold finger in order to achieve a better mixture of the two components.
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