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Structural and dielectric characteristics of 0.50 Bi2O 3-0.25 V2O5-0.25 SrB4O7 glass-ceramic

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2 Author(s)
M. V. Shankar ; Mater. Res. Centre, Indian Inst. of Sci., Bangalore, India ; K. B. R. Varma

Novel 0.50 Bi2O3-0.25 V2O5 -0.25 SrB4O7 glasses have been prepared via a conventional splat-quenching technique. Differential thermal analysis (DTA) carried out on the as-quenched samples confirms their glassy nature and shows a prominent exothermic peak at 400°C. The X-ray powder diffraction (XRD) pattern of the heat treated sample could be indexed to an orthorhombic ferroelectric Bi2VO5.5 phase with the lattice parameters a=5.543, b=5.615 and c=15.321 A. The presence of nano-crystallites of bismuth vanadate, Bi2VO5.5 (BiV) dispersed in the glassy matrix of strontium tetraborate, SrB4O7 (SBO) is confirmed in the heat treated (at 400°C for 12 h) samples, by high resolution transmission electron microscopy (HRTEM). The dielectric constant (ετ), measured as a function of temperature, exhibits an anomaly around the transition temperature of the parent crystalline BiV. The ετ of the glass-ceramic at 300K is comparable with that predicted by Maxwell's model and logarithmic mixture rule

Published in:

Applications of Ferroelectrics, 1996. ISAF '96., Proceedings of the Tenth IEEE International Symposium on  (Volume:2 )

Date of Conference:

18-21 Aug 1996