Melo, B.M.G. and Graça, M.P.F. and Prezas, P.R. and Valente, M.A. and Almeida, A.F. and Freire, F.N.A. and Bih, L. (2016) Study of structural, electrical, and dielectric properties of phosphate-borate glasses and glass-ceramics. Journal of Applied Physics, 120 (5).

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In this work, phosphate-borate based glasses with 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 as-prepared glasses were heat-treated in air at 800 °C for 4 h, which led to the formation of glass-ceramics. These high chemical and thermal stability glasses are good candidates for several applications such as fast ionic conductors, semiconductors, photonic materials, electrolytes, hermetic seals, rare-earth ion host solid lasers, and biomedical materials. The present work endorses the analysis of the electrical conductivity of the as-grown samples, and also the electrical, dielectric, and structural changes established by the heat-treatment process. The structure of the samples was analyzed using X-Ray powder Diffraction (XRD), Raman spectroscopy, and density measurements. Both XRD and Raman analysis confirmed crystals formation through the heat-treatment process. The electrical ac and dc conductivities, σac and σdc, respectively, and impedance spectroscopy measurements as function of the temperature, varying from 200 to 380 K, were investigated for the as-grown and heat-treated samples. The impedance spectroscopy was measured in the frequency range of 100 Hz-1 MHz. © 2016 Author(s).

Item Type: Article
Uncontrolled Keywords: Biomedical engineering; Ceramic materials; Chemical stability; Dielectric properties; Hardening; Heat treatment; Hermetic seals; Ionic conduction in solids; Metal ions; Niobium oxide; Spectroscopy; Spectrum analysis; Structural ceramics; X ray powder diffraction, AC and DC conductivities; Biomedical material; Electrical conductivity; Fast ionic conductors; Heat treatment process; Impedance spectroscopy; Impedance spectroscopy measurements; Melt quenching techniques, Glass ceramics
Subjects: Physics and Astronomy
Divisions: SCIENTIFIC PRODUCTION > Physics and Astronomy
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:49

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