Journal of Materials Science

, Volume 13, Issue 1, pp 149–154 | Cite as

Critical size and shape of CdO ex-Cd(OH)2 crystallites

  • J. C. Niepce
  • G. Watelle


The present paper reports the extent to which the size and shape of oxide crystallites resulting from a decomposition reaction depend on the crystallite size of the initial material. If those sizes are sufficiently large i.e. higher than “critical sizes”, the resulting oxide crystallites assume exactly these “critical sizes”. They are the maximum size that can be reached by oxide crystallites in the absence of any evolution process such as ageing or sintering and are specific to a particular shape of these crystals, which is independent of initial crystallite size. Alternatively, if the initial material crystals are below these “critical sizes”, at least in one direction, then the dimensions and shape of the oxide crystallites depend on the size of the initial crystallites. These results were interpreted within the framework of the structural conversion mechanism related to the decomposition reaction and showing great similarities with a shear transformation.


Oxide Polymer Evolution Process Crystallite Size Maximum Size 
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  1. 1.
    J. C. Niepce andG. Watelle,C.R. Acad. Sci. Paris,276C (1973) 627.Google Scholar
  2. 2.
    J. C. Niepce, P. Dumas andG. Watelle, 2nd International Conference of the Electrochemistry Society, Boston, USA, 1973, p. 256Google Scholar
  3. 3.
    J. C. Niepce, Thesis, University of Dijon, France, 1976.Google Scholar
  4. 4.
    J. C. Niepce,Rev. Int. Htes Temp. et Refract.,14 (1977) 173.Google Scholar
  5. 5.
    P. Dumas, N. Ea, J. C. Niepce andG. Watelle,J. Solid State Chem. (in press).Google Scholar
  6. 6.
    P. Scherrer,Nachr. Göttinger Gesel. Dtsch. 2 (1918) 98.Google Scholar
  7. 7.
    B. E. Warren,J. Appl. Phys. 12 (1941) 373.Google Scholar
  8. 8.
    C. L. Cronan, F. J. Micale, M. Topic, H. Leidheiser, A. C. Zettlemoyeur andS. Popovic,J. Coll. and Sin. Sc. 55 (1976) 546.Google Scholar
  9. 9.
    J. C. Niepce, M. T. Mesnier andD. Louer,J. Solid State Chem. 22 (1977).Google Scholar
  10. 10.
    I. F. Guilliatt andN. H. Brett,Phil. Mag. 23 (1971) 647.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1978

Authors and Affiliations

  • J. C. Niepce
    • 1
  • G. Watelle
    • 1
  1. 1.Laboratoire de Recherche sur la Réactivité des Solides (Associé au C.N.R.S.)Faculté des Sciences Mirande, Campus UniversitaireDijonFrance

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