Diffusion in Solids

  • V. Ramakrishna

Abstract

Blaring the last three to four decades two factors have spurred the interest of scientists enormously in this subject? one is the availability of radioactive isotopes for diffusion studies? and the Second, the greater preoccupation of metallurgists “with the scientific foundations of what has been tiU recently a semi-empirical activity. Quantitative measurements of diffusion have been carried out extensively and excellent monographs and reviews of this work are available (1–12). These quantitative data are usually expressed in terms of a “diffusion coefficient”. Unforttmately, however, in the earlier experiments conditions of measurements have not been defined scrupulously. Hence it is not an exaggeration to state that the data reported until about 1950 or so are of doubtful dependability. In the last two decades, our understanding of the diffusion phenomena has improved considerably. At the same time considerable advances have been made in the experimental techniques using a variety of radio-active isotopes of high specific activity. Also, some novel methods of diffusion measurements have been introduced. In the present article, a discussion about the nature of diffusion coefficient D will first be presented, followed by a brief outline of experimental methods.

Keywords

Permeability Porosity Quartz Furnace Welding 

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Copyright information

© Plenum Press, New York 1970

Authors and Affiliations

  • V. Ramakrishna
    • 1
  1. 1.Department of ChemistryIndian Institute of TechnologyNew Delhi-29India

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