ИСТИНА

The basis of classical photographic process in silver halide emulsions consists of photochemical nucleation and subsequent electrochemical growth of the silver clusters to metallic silver phase. However, the problem of the nature and size of the silver clusters capable to initiate the development of emulsion grains remains not enough clear. The present report is devoted to an analysis of the process of silver centres growth in silver bromide microcrystals and other substrates based on the concepts of the thermodynamics of a new phase formation and growth taking into account results obtained by means of electron microscope studies. Furthermore the peculiarities of activity and stability of clusters formed by a metal nobler than silver are discussed too.