Phase Formation and Grain Growth of BSCZT Ceramics Prepared by BST-BZT Seed Induced Method

Abstract:

In this work, lead-free Ba_0.4Sr_0.4Ca_0.2Zr_0.05Ti_0.95O₃ ceramics were prepared by the seed induced method using (0.5Ba_0.6Sr_0.4TiO₃–0.5BaZr_0.05Ti_0.95O₃) (BST-BZT) seed. Seed crystals with concentrations of 0, 2.5, 5, 7.5, 10 mol% were mixed with BSCZT powder for 24 h and sintered at 1400 °C for 4 h. The phase formation and microstructure of BSCZT ceramic were characterized by X-ray diffraction technique (XRD) and the scanning electron microscopy (SEM). All samples showed a single phase perovskite structure without impurities and exhibited the existence of the tetragonal phase. The density values of the ceramics decreased from 4.90 to 4.75 g/cm³ with increasing seed crystal concentrations. The grain size of the sample without seed was 3.71 μm, whereas a grain size of 8.99 μm was observed for the sample with 10 mol% seed crystal. The dielectric constant at room temperature at 1 kHz was 1831 for the sample with 10 mol% seed crystal while the dielectric constant of the sample without seed was 1484. From the results in this work, BST-BZT seed can increase grain size and improve the dielectric constant at room temperature.

• Periodical: Key Engineering Materials (Volume 766)
• Pages: 175-179
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.766.175
• Online since: April 2018
• Authors: Jiraporn Dangsak, Sukum Eitssayeam, Denis Russell Sweatman*, Uraiwan Intatha
• Keywords: Perovskite Structure, Seed Induced, X-Ray Diffraction

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