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The electric behavior of a lithium-niobate-phosphate glass and glass-ceramics

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Abstract

A glass with a composition of 50Li2O-40P2O5-10Nb2O5 (% mol) was prepared by the melt-quenching method and heat-treated in air between 450 and 500°C. The samples were studied using X-ray powder diffraction (XRD), density measurements, Raman spectroscopy, scanning electron microscopy (SEM), dc electrical conductivity (σdc) and dielectric measurements.

The LiNbO3 crystalline phase was detected in the samples heat-treated at 480 and 500°C. The dc conductivity, at 300 K, decreases and the activation energy increases with the rise of the heat-treatment temperature. The dielectric data between 1 Hz and 100 kHz, at room temperature, were studied using the impedance formalism (Z*). These results show the existence of a relaxation mechanism, probably associated with a distribution of relaxation times. The mean value of the relaxation time, τσ, increases with the rise of the heat-treatment temperature. The fit of the dielectric data with a complex nonlinear least squares algorithm (CNLLS), reveals that a resistor (R), in parallel with a constant phase element (CPE, Z CPE = 1/[Y 0(jw) n]), is a good equivalent circuit. The R-value has a maximum for the sample heat-treated at 480°C, and the n parameter has the inverse behavior. The Y 0 parameter decreases with the increase of the heat-treatment temperature.

The dielectric constant value, at 1 kHz and room temperature, increases from 39.98 up to 97.80 with the rise of the heat-treatment temperature. These results suggest that exists a relation between the number of LiNbO3 ferroelectric crystals present in the glass-ceramics and the dielectric constant values.

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Authors and Affiliations

  1. Departamento de Física, Universidade de Aveiro, Aveiro, 3800-193, Portugal

    M. P. F. Graça & M. A. Valente

  2. Departamento de Engenharia Cerâmica e do Vidro (CICECO), Universidade de Aveiro, 3800-193, Aveiro, Portugal

    M. G. Ferreira Da Silva

Authors
  1. M. P. F. Graça
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  2. M. A. Valente
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  3. M. G. Ferreira Da Silva
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Graça, M.P.F., Valente, M.A. & Ferreira Da Silva, M.G. The electric behavior of a lithium-niobate-phosphate glass and glass-ceramics. J Mater Sci 41, 1137–1144 (2006). https://doi.org/10.1007/s10853-005-3652-6

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  • DOI: https://doi.org/10.1007/s10853-005-3652-6

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