Properties of sol-gel derived strontium barium niobate ceramics and the effect of V2O5 additive

• Published in: Journal of materials science 2001-11, Vol.36 (22), p.5519-5527
• Main Authors: ORAL, A. Y, MECARTNEY, M. L
• Format: Article
• Language: English
• Subjects: Acetic acid; Alkoxides; Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Ceramic powders; Ceramics; Chemical industry and chemicals; Composition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Densification; Dielectric properties of solids and liquids; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Electrotechnical and electronic ceramics; Exact sciences and technology; Gels; Heat treatment; Materials science; Niobates, titanates, tantalates, pzt ceramics, etc; Organic chemistry; Permittivity (dielectric function); Phase diagrams; Physics; Sintering (powder metallurgy); Sol-gel processes; Strontium; Strontium barium niobate; Technical ceramics; Tungsten bronze; Vanadium pentoxide
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1012470722910

Strontium barium niobate, SrxBa1−xNb2O6, (SBN) ceramics with a range of Sr/Ba ratios were fabricated using a solution chemistry approach with alkoxides dissolved in acetic acid. Powders obtained from dried gels were calcined at 800°C for three hours, a heat treatment that produced fully crystalline powders. After preparing bulk ceramics from these powders by sintering at 1200°C for 1–24 hours, the tetragonal tungsten bronze (TTB) phase was present in all compositions between 0 ≤ x≤ 1, although not predicted by the phase diagram for BaNb2O6and SrNb2O6. Vanadium pentoxide (V2O5) additions increased the densification, the amount of tungsten bronze phase, and the dielectric constant for all compositions except for Sr0.65Ba0.35Nb2O6(SBN65) ceramics.