Effect of Particle Sizes of BaTiO₃ (BT) Seed on Microstructure and Electrical Properties of (Ba_0.85Ca_0.15)(Zr_0.1Ti_0.9)O₃

Abstract:

The study was conducted to find out the effect of particle sizes of BaTiO₃ (BT) seed on the microstructure and electrical properties of (Ba_0.85Ca_0.15)(Zr_0.1Ti_0.9)O₃ (BCZT) ceramics. The BT seeds were prepared by the molten salt method. Results indicated that the BT seed powder showed a single pure perovskite phase when using a low temperature of ~750°C. The particle sizes of BT seeds increased from ~381 to ~600 nm with increasing heating temperatures from 750 to 900°C. After that, the different BT seeds were mixed with BaCO₃, CaCo₃, ZrO₂ and TiO₃ via the solid state reaction method. The mixed powder was calcined and sintered at 1200 °C for 2 h and 1450 °C for 4 h, respectively. The microstructure, phase formation and electrical properties were investigated. All ceramic samples showed a pure perovskite phase. The density and average grain size values of ceramics were in the range of 5.36-5.47 g/cm³ and 9.83-11.86 μm, respectively. The highest values of dielectric constant (ε_r), piezoelectric constant (d₃₃) were 3393 and 452 pC/N, respectively which obtained at the sample of BT-seed size 372 nm doped.

• Periodical: Key Engineering Materials (Volume 690)
• Pages: 51-56
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.690.51
• Online since: May 2016
• Authors: Manlika Kamnoy, Piewpan Parjansri, Uraiwan Intatha, Sukum Eitssayeam, Tawee Tunkasiri*
• Keywords: BCZT, Electrical Properties, Lead-Free Ceramics, Molten Salt

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