Characterization of Sol Gel Prepared KTN Thin Films and Powders by Raman, XRD, and Thermal Analysis Techniques.

Abstract

The renewed interest in KTa1-xNbxO (KTN) mixed perovskite materials is connected with their remarkable dielectric properties in the dilute compositions. KTN thin films with x = 0.35 have been prepared on different substrates by sol-gel technique as well as a set of powders with x = 0, 0.05, 0.1, 0.25, 0.48, 0.65, 0.75, and 1. Properties of the material change drastically with the change of x, because of relaxation of both translational and inversion symmetry due to a static disorder in the Nb distribution and the dynamic effect of a precursor ferroelectric order above Tc. Special attention was paid to the characteristic feature of coupling of the single-phonon state to a two-acoustic-phonon feature through anharmonic terms in the potential function as well as behavior of the TO3 mode which becomes a narrow peak of the first-order scattering in the tetragonal ferroelectric phase and shows a tendency to split below Tc2 in the orthorhombic phase. The wide range of x allows better understanding of dynamic processes in the KTN bulk materials which in turn helps in the studies of thin films. The above mentioned materials were studied using Raman scattering, XRD, and thermal analysis techniques.

This is a preview of subscription content, access via your institution.

References

  1. 1.

    M.E. Lines and A.M. Glass, “Principles and Applications of Ferroelectrics and Related Materials,” Clarendon Press, Oxford, 1977.

    Google Scholar 

  2. 2.

    S.H. Wemple, Phys. Rev. 137, A1575 (1965).

    Article  Google Scholar 

  3. 3.

    C.H. Perry and T.F. McNelly, Phys. Rev. 154, 456 (1967).

    CAS  Article  Google Scholar 

  4. 4.

    A.D. Bruce and R.A. Cowley, Adv. Phys. 29, 220 (1980).

    Google Scholar 

  5. 5.

    R.L. Prater, L.L. Chase, and L.A. Boatner, Phys. Rev. B 23, 221 (1981).

    CAS  Article  Google Scholar 

  6. 6.

    S.K. Manlief and H.Y. Fan, Phys. Rev. B 5, 4046 (1972).

    Article  Google Scholar 

  7. 7.

    C.H. Perry, R.R. Hayes, and N.E. Tornberg, in “Light Scattering in Solids,” M. Balkanski, R.C.C. Leite, S.P.S. Porto, Eds., p. 812, Flammarion, Paris, 1976.

    Google Scholar 

  8. 8.

    A.A. Savvinov, I.G. Siny, R.S. Katiyar, and L.A. Knauss, Ferroelectric Letters 25, 59 (1999).

    Article  Google Scholar 

  9. 9.

    Dinghua Bao, Anxiang Kuang, J. Crystal Growth, 171, 314 (1997)

    CAS  Article  Google Scholar 

  10. 10.

    A.A. Savvinov, I.G. Siny, R.S. Katiyar, M. Pumarol, H.A. Mourad and F.E. Fernandez, Integrated Ferroelectrics, 29, A13 (2000).

    Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to A. A. Savvinov.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Savvinov, A.A., Majumder, S.B. & Katiyar, R.S. Characterization of Sol Gel Prepared KTN Thin Films and Powders by Raman, XRD, and Thermal Analysis Techniques.. MRS Online Proceedings Library 718, 419 (2002). https://doi.org/10.1557/PROC-718-D4.19

Download citation