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Journal of Materials Science

, Volume 42, Issue 8, pp 2543–2550 | Cite as

Structural and electrical properties of SiO2–Li2O–Nb2O5 glass and glass-ceramics obtained by thermoelectric treatments

  • M. P. F. Graça
  • M. G. Ferreira da Silva
  • M. A. Valente
Article

Abstract

Glass and glass-ceramics with the molar composition of 60SiO2–30Li2O–10Nb2O5 (mole %) were studied. Ferroelectric lithium niobate (LiNbO3) nanocrystals were precipitated in the glass matrix trough a thermal treatment, with and without the simultaneous application of an external electric field. The as-prepared sample, yellow and transparent, was heat-treated (HT) at 600 and 650 °C and thermoelectric treated (TET) at 600 °C. The applied electric fields were the following ones: (i) 5 × 104 V/m; (ii) 1 × 105 V/m. Differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman and dielectric spectroscopies were used to investigate the glass samples properties.

The LiNbO3 crystalline phase was detected in the 650 °C HT sample and in the 600 °C TET samples. The presence of an external electric field, during the heating process, promotes the glass crystallization at lower temperatures. In the TET samples, the surface crystallization of the cathode and the anode are different.

The number and size of the crystallites, in the glass network, dominate the electrical dc behavior while the ac conductivity process is more dependent of the glass matrix structure.

The obtained results reflect the important role carried out by the temperature and the applied electric field in the glass-ceramic structures.

Keywords

LiNbO3 External Electric Field Applied Electric Field Glass Matrix Lithium Niobate 
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.

Notes

Acknowledgements

The authors thank to the Fundação para a Ciência e Tecnologia (FCT), for the financial support (SFRH/BD/6314/2001).

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • M. P. F. Graça
    • 1
  • M. G. Ferreira da Silva
    • 2
  • M. A. Valente
    • 1
  1. 1.Physics department (FSCOSD)Aveiro UniversityAveiroPortugal
  2. 2.Glass and ceramic engineering department (CICECO)Aveiro UniversityAveiroPortugal

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