Thermally Stimulated Depolarization Studies of Ionic Solids

  • Rosanna Capelletti
Part of the NATO ASI Series book series (NSSB)

Abstract

Relevant physical properties of crystalline solids (for instance electric resistivity, color, mechanical strength, etc.) and applications (integrated electronics, laser etc.) are determined by the presence of lattice defects (vacancies, interstitials, impurities and complexes built by them). According to the specific nature of defects, suitable techniques have been developed. In ionic solids, defects often bear an electric charge (cation and anion vacancies, interstitial ions, aliovalent impurities). As a consequence of the Coulomb interaction between defects of opposite charge, complexes may be formed, which exhibit an electric dipole moment. Other defects, even in non ionic solids, may he endowed by their own dipole moment. Hence electrical methods such as dielectric losses (tgδ), isothermal depolarisation currents and more recently ionic thermocurrents (ITC) are suitable to monitor such defects. This last method, introduced by Bucci and Fieschi in 1964, deals with the detection and analysis of thermostimulated depolarization currents arising from ion redisplacements in solids whose electronic conductivity is neglegible (1,2). In a sense ITC enters in the wide class of methods based on the thermal release of stored energy, as for instance thermoluminescence (TL), thermally stimulated currents (TSC) and thermally stimu lated depolarization currents (TSDC). ITC deals with TSDC as well, but is restricted to polarization mechanisms, in which only ion redisplacements are involved ruling out a wide class of phenomena which occur in electrets such as carrier injection, electron and/or hole trapping. In this way ITC is more descriptive and specific term than the more general TSDC, which is used by some authors. Due to this restriction and its successful application to simple model systems, such as ionic crystals, it has opened the way for a quantitative study of dipolar processes also in more complex systems of technological interest.

Keywords

Cation Vacancy Ionic Crystal Anion Vacancy Alkali Halide Silver Halide 
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.

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References

  1. 1.
    C.Bucci and R.Fieschi - Phys.Rev.Lett. 12, 16 (1964).ADSCrossRefGoogle Scholar
  2. 2.
    C.Bucci, R.Fieschi and G.Cuidi - Phys.Rev. 148, 816 (1966).ADSCrossRefGoogle Scholar
  3. 3.
    A.J.Dekker - Solid State Physics - Prentice Hall, Inc. 1958.Google Scholar
  4. 4.
    R.Capelletti and R.Fieschi - Intern.Symp.On Electrets and Dielectrics. Ed.Academia Brasileira de Ciencias - Rio de Janeiro 1977, p.131.Google Scholar
  5. 5.
    R.Capelletti, R.Fieschi, A.Gainotti, C.Mora, L.Romana and E.Zecchi – De–fects in Insulating Crystals. Ed.V.M.Tuckevich and K.K.Shvarts – Springer Verlag – Berlin 1981 (ISBN 3–540–10782–7) p.675.Google Scholar
  6. 6.
    F.Cussò and F.Jaque - J.Phys.C:Solid St.Phys. 15, 2875 (1982).ADSCrossRefGoogle Scholar
  7. 7.
    D.A.Golopentia and L.M.Slifkin - Phys.Stat.Sol.(a) 72, 123 (1982).ADSCrossRefGoogle Scholar
  8. 8.
    Ch.Kokott and F.Fischer Phys.Stat.Sol.(b) 106, 141 (1981).ADSCrossRefGoogle Scholar
  9. 9.
    M.SiuLi, M.De Souza and S.E.Kapphan - Phys.Stat.Sol.(B) 112, 685 (1982).ADSCrossRefGoogle Scholar
  10. 10.
    R.Capelletti, R.Fieschi, G.Lenzi, M.Manfredi, C.Mora and R.Reverberi - Proc.5th Intern.Simp.Electrets, Heidelberg 1985 (Avail.From IEEE,NY), p.463.Google Scholar
  11. 11.
    R.Capelletti, M.G.Bridelli, M.Friggeri, G.Ruani, I.Foldvari, L.Kovacs and A.Watterich - ibid. p.294.Google Scholar
  12. 12.
    R.Capelletti - Radiation Effects 74, 119 (1983).CrossRefGoogle Scholar
  13. 13.
    P.Aceituno and F.Cussó - Phys.Rev. 13, 7577 (1982).CrossRefGoogle Scholar
  14. 14.
    T.Roth - J.Appl.Phys. 44, 1056 (1973).ADSCrossRefGoogle Scholar
  15. 15.
    P.Dansas, S.Mounier, P.Sixou - C.R.Acad.Sc.Paris 267B, 1223 (1968).Google Scholar
  16. 16.
    F.Rull, L.F.Sanz and J.A.De Saja - J.Electrostatics 8, 221 (1980).CrossRefGoogle Scholar
  17. 17.
    M.Bridelli, R.Capelletti and P.R.Crippa - Bioelectrochem.And Bioenerg. 8, 555 (1981).CrossRefGoogle Scholar
  18. 18.
    M.G.Bridelli, R.Capelletti, G.Ruani, A.Vecli Proc.5th Intern.Symp.Elec trets, Heidelberg 1985 (Avail.From IEEE,NY), p.831.Google Scholar
  19. 19.
    J.L.Leveque, J.C.Garson and G.Boudouris - Biopol 16, 1725 (1977).CrossRefGoogle Scholar
  20. 20.
    F.Ehrburger and J.B.Donnet - J.Appl.Phys. 50, 1478 (1979).ADSCrossRefGoogle Scholar
  21. 21.
    R.Capelletti, A.Gainotti and M.Suszynska - Proc.5th Intern.Symp.Electrets, Heidelberg 1985 (Avail.From IEEE,NY), p.151.Google Scholar
  22. 22.
    N.Suarez, E.Laredo, D.Figueroa and M.Pma - Radiation Effects 75, 105 (1983).CrossRefGoogle Scholar
  23. 23.
    J.N.Marat-Mendes and J,D.Comins - J.Phys.C. 37, C7–132 (1976).Google Scholar
  24. 24.
    J.H.Crawf.Ord,Jr. and E.L.Kitts,Jr. - in Recent Advances in Science and Technology of Materials - ed.A.Bishay - vol.1, p.15.Google Scholar
  25. 25.
    P.B.Fitzsimons and J.Corish - private communication.Google Scholar
  26. 26.
    P.Müller - Phys.Stat.Sol.(A) 67, 11 (1981).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1986

Authors and Affiliations

  • Rosanna Capelletti
    • 1
  1. 1.Dipartimento di Fisica - CISM-GNSMUniversity of ParmaParmaItaly

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