DOI QR코드

DOI QR Code

Dielectric Properties and an EPR Study of Cu- or Zr-Doped BaTiO₃ Ceramics

  • Published : 1995.10.20

Abstract

The EPR spectra of Cu-or Zr-doped BaTiO3 ceramics exhibited absorption signals with g∥=2.380 and g⊥=2.063 which are assigned to Ba1+(Ba2+ + e'→Ba1+) ion reduced by an electron that was produced from the oxygen vacancy (VO..). The intensity of these signals decreased as the temperature increased indicating that Ba1+ was changed to Ba2+ as the temperature increased. These ceramics also showed the EPR signal with g=1.997 around TC which arises from ionized Ba-vacancies, VBa'(VBa + e'→VBa'. In the orthorhombic and tetragonal phase region g=1.997 signal was not seen. The electrons generating from the oxidation of Ba1+ and ionized Ba-vacancies may contribute to a space charge which is responsible for a dielectric relaxation of these samples.

Keywords

References

  1. Ferroelectrics. v.109 Batllo, F.;Duverger, E. Jules, J.;Niepce, J.;Jannot, B.;Maglione, M.
  2. J. Sol. State Phys. Kroger, K. A.;Vink, H.
  3. Solid State Electronics. v.3 Heywang, W.
  4. J. Am. Ceram. Soc. v.63 Nemoto, H.;Oda, I.
  5. J. Phys. Soc. Jap. v.14 Saburi, O.
  6. Jap. J. Appl. Phys. v.10 Brahmecha, B. G.;Sinha, K. P.
  7. Philips Res. Repts. v.31 Daniels, J.
  8. Zeit. Angew. Phys. v.29 Brauer, H.
  9. J. Mat. Sci. v.6 Heywang, W.
  10. Solid State Electromics. v.17 Brauer, H.
  11. Bull. Mag. Res. v.1 Eaton, S. S.;Eaton, G. R.
  12. Properties and preparation of perouskite-Type Compounds Galasso, F. S.
  13. Mat. Res. Bull. v.20 Kutty, T. R. N.;Murugaraj, P.;Gajbhiye, N. S.
  14. Mat. Res. Bull. v.21 Kutty, T. R. N.;Devi, L. G.;Murugaraj, P.
  15. Mat. Letters. v.2 Kutty, T. R. N.;Murugaraj, P.;Gajbhiye, N. S.
  16. J. Amer. Ceram. Soc. v.57 Hennings, D.;Pomplum, H.
  17. J. Opt. Soc. Amer. v.B3 Klein, M. B.;Schwartz, R. N.
  18. J. Mat. Sci. Rodel, J.
  19. Phys. Rev. B. v.36 Morretti, P.;Calendini, F. M.
  20. ibid. v.20 Siegel, E.;Muller, K. A.
  21. Solid State Comm. v.61 Muller, K. A.