Dielectric Analysis of Phosphate-Borate Glass-Ceramics Doped with Alkali Oxides

  • B. M. G. Melo
  • M. A. Valente
  • M. P. F. Graça
Conference paper
Part of the NATO Science for Peace and Security Series B: Physics and Biophysics book series (NAPSB)


The synthesis of dielectric materials with high-energy density is fundamental for capacitors in power electronics and pulsed power applications. Ceramic materials have been broadly used for capacitors due to their high dielectric constant. However, they have some disadvantages such as a low breakdown strength and a high remanent polarization, which limits their application in high-voltage devices. The development of glass-ceramics with high dielectric constant and high breakdown strength can be a promising solution for applications in high-voltage and impulse power systems. In the present work, functional glasses with the molar composition 20.7P2O5–17.2Nb2O5–13.8WO3–34.5A2O–13.8B2O3 where A=Li, Na, and K were prepared by the melt quenching technique. The base glasses were heat-treated in air at 800 °C for 4 h, which led to the formation of glass-ceramics. The present work studies the ac conductivity and dielectric properties in the 200–650 K temperature range of the glass doped with K2O. Impedance spectroscopy was used in the frequency range 100 Hz to 1 MHz in order to characterize electrically the glass.


Glass-ceramics Glass Dielectric constant Impedance spectroscopy Ac conductivity Electrical characterization Dielectric relaxation 


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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • B. M. G. Melo
    • 1
  • M. A. Valente
    • 1
  • M. P. F. Graça
    • 1
  1. 1.I3N and Physics DepartmentAveiro UniversityAveiroPortugal

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