Journal of Materials Science

, Volume 29, Issue 9, pp 2513–2520 | Cite as

Effect of defects induced by doping and fast neutron irradiation on the thermal properties of lithium ammonium sulphate crystals

  • S. H. Kandil
  • M. E. Kassem
  • A. M. El-Khatib
  • T. A. Ramadan
  • M. M. Darwish


Structural defects were introduced in lithium ammonium sulphate crystals (LAS) either in the process of crystal growth (in the form of foreign ions) or by neutron irradiation. The effect of such defects on the thermal properties of LAS crystals was studied in the temperature range 300–500 K. It was assumed that the doped LAS crystals are composed of a two-phase system having different thermal parameters in each phase. The specific heat at constant pressure, Cp, of irradiated samples was found to decrease with increasing irradiation doses. The thermal expansion of LAS crystals was found to be dependent on neutron irradiation, and was attributed to two processes: the release of new species and the trapping process.


Lithium Thermal Expansion Irradiation Dose Thermal Property Crystal Growth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    R. Pepinsky, K. Vedam, Y. Okaya and S. Hoshino, Phys. Rev. III (1958) 1467.CrossRefGoogle Scholar
  2. 2.
    T. Mitsui, T. Oka, Y. Shiroishi, M. Takashige, K. Lio and S. Sawada, J. Phys. Soc. Jpn 39 (1975) 845.CrossRefGoogle Scholar
  3. 3.
    A. I. Kruglik, Kristallogr. 23 (1978) 494.Google Scholar
  4. 4.
    W. C. Hamilton, Acta. Crystallogr. 18 (1965) 502.CrossRefGoogle Scholar
  5. 5.
    “International Tables for X-ray Crystallography”, Vol. III (Kynoch press, Birmingham 1968).Google Scholar
  6. 6.
    K. Itoh, H. Ishikura and E. Nakamura, Acta. Crystallogr. B37 (1981) 664.CrossRefGoogle Scholar
  7. 7.
    I. M. Iskornev and I. N. Flerov, Sov. Phys. Solid State 19 (1977) 605.Google Scholar
  8. 8.
    P. E. Tomaszewski and A. Pietraszko, Phys. Status Solidi (b) 65 (1979) 467.CrossRefGoogle Scholar
  9. 9.
    W. A. Dollase, Acta. Crystallogr. B25 (1969) 2298.CrossRefGoogle Scholar
  10. 10.
    S.A. Mahmoud, N. G. Gomaa, A. M. El-Khatib and M. E. Kassem, in “First Arab Symposium on Materials Science”, Vol. 4, Alexandria (1987).Google Scholar
  11. 11.
    S. H. Kandil, M. E. Kassem, A. M. El-Khatib, M. A. El-Gamal and E. F. El-Wahidy, J. Mater. Sci. Lett. 6 (1987) 1261.CrossRefGoogle Scholar
  12. 12.
    M. E. Kassem, E. A. Ammar, A. M. El-Khatib and E. F. El-Wahidy, J. Thermal Anal. 35 (1989) 2403.CrossRefGoogle Scholar
  13. 13.
    M. E. Kassem, N. G. Gomaa, A. M. El-Khatib And S. H. Kandil, Phys. Status Solidi (a) 117 (1990) 119.CrossRefGoogle Scholar
  14. 14.
    M. E. Kassem, A. M. El-Khatib, A. E. Hamid And S. H. Kandil, Ferroelect. Lett. 13 (1991) 215.CrossRefGoogle Scholar
  15. 15.
    M. E. Kassem, A. M. El-Khatib, E. A. Ammar and M. M. Denton, J. Thermal Anal. Google Scholar
  16. 16.
    A. M. El-Khatib, S. A. Mahmoud and B. M. Moharram, Isotopenpraxis 22 (1986) 7.Google Scholar
  17. 17.
    International Commission on Radiological Protection, “Data for Protection Against Ionizing Radiation from External Sources, Supplement to CRP Publication 15”, ICRP Publication 21 (Pergamon Press, Oxford, 1973).Google Scholar
  18. 18.
    H. Shimizu, A. Oguri, N. Yasuda and S. Fujimoto, J. Phys. Soc. Jpn 45 (1978) 505.CrossRefGoogle Scholar
  19. 19.
    K. S. Aleksandrov, I. P. Aleksandrova, A. T. Anistratov and V. E. Shabanov, Izv. Akad. Nauk. SSSR Ser. Fiz. 41 (1977) 599.Google Scholar
  20. 20.
    S. Shiozaki, A. Sawada, Y. Ishibashi and Y. Takagi, J. Phys. Soc. Jpn 42 (1977) 353.CrossRefGoogle Scholar
  21. 21.
    T. Osaka, ibid. 45 (1978) 571.CrossRefGoogle Scholar
  22. 22.
    K. Okada, J. A. Gonzalo and J. M. Rivers, J. Phys. Chem. Solids 28 (1957) 689.CrossRefGoogle Scholar
  23. 23.
    G. M. Loiacono, M. Deflino, A. Shaulov, W. A. Smith and M. I. Bell, Ferroelectrics 29 (1980) 181.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • S. H. Kandil
    • 1
  • M. E. Kassem
    • 1
    • 2
  • A. M. El-Khatib
    • 1
    • 2
  • T. A. Ramadan
    • 1
  • M. M. Darwish
    • 1
  1. 1.Department of Materials ScienceInstitute of Graduate Studies and ResearchAlexandriaEgypt
  2. 2.Department of Physics, Faculty of ScienceAlexandria UniversityAlexandriaEgypt

Personalised recommendations