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Preparation, structure, morphology, and dc and ac conductivity of the 88SiO2-6Li2O-6Nb2O5 (% mole) sol-gel derived glass-ceramics

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Abstract

The glass composition 88SiO2-6Li2O-6Nb2O5 (mole %) was successfully prepared by the sol-gel technique. The dried and translucent gel was heat-treated at temperatures between 500°C and 800°C. Lithium niobate crystallites, an important ferroelectric material, were detected in the gel derived glass-ceramics treated above 650°C. In the samples treated at 700 and 800°C the Li2Si2O5 crystalline phase is present. The 800°C treated sample also presents the Li3NbO4 phase.

The structure and morphology of the samples were studied by X-ray powder diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM). The SEM revealed that all the samples, heat-treated above 650°C, present crystallites embedded in the glass matrix. The particles detected in the 600°C treated sample are essentially amorphous, or with an incipient structure. The temperature dependence of the dc electrical conductivity (σ dc ) shows two regions with different activation energies. The conductivity behaviour of the sample is mainly due to the mobile ion number. The ac conductivity (σ ac ), measured at 1 kHz decreases with the rise of the treatment temperature due to the increase of the LiNbO3 crystallites amount.

The electrical behavior of the glass and glass-ceramics reflects the important role carried out by the treatment temperature in the gel-glass structure.

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Acknowledgments

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

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Authors and Affiliations

  1. Physics Department (13N), Aveiro University, Campus Universitário de Santiago 3800-193, Aveiro, Portugal

    M. P. F. Graça & M. A. Valente

  2. Glass and Ceramic Engineering Department (CICECO), Aveiro University, Campus Universitário de Santiago 3800-193, Aveiro, Portugal

    M. G. Ferreira da Silva

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  1. M. P. F. Graça
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  2. M. G. Ferreira da Silva
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  3. M. A. Valente
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Correspondence to M. P. F. Graça.

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Graça, M.P.F., Ferreira da Silva, M.G. & Valente, M.A. Preparation, structure, morphology, and dc and ac conductivity of the 88SiO2-6Li2O-6Nb2O5 (% mole) sol-gel derived glass-ceramics. J Sol-Gel Sci Technol 42, 1–8 (2007). https://doi.org/10.1007/s10971-006-1514-6

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  • DOI: https://doi.org/10.1007/s10971-006-1514-6

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