The Electrical Properties of BCZT Lead-Free Ceramics Induced by BaZrO₃ Seeds

Abstract:

Ba_0.85Ca_0.15Zr_0.1Ti_0.9O₃ (BCZT) ceramics were produced by using the seed-induced method. The nano-particle BZ (BaZrO₃) seeds were mixed with BaCO₃, CaCO₃, ZrO₂ and TiO₂ powder for preparing by the mixed oxide method. The XRD results indicated that all powder and sintered ceramic samples showed a pure perovskite phase with coexistence between rhombohedral and tetragonal phase. As the BZ seed content increased, the density of ceramics tended to decrease from 5.61 g/cm³ to 5.37 g/cm³. The average grain size of the ceramics was in the range of 12.15 -13.50 mm. The dielectric loss (tand) was less than 0.03 for all samples at room temperature (at 1 kHz). Other electrical properties, including dielectric constant (ε_r), remnant polarization (P_r), and piezoelectric charge coefficient (d₃₃) values decreased with increasing BZ seed doping with relates to the decreasing grain size and density of BCZT ceramics. However, the values of coercive field (E_c) decreased and piezoelectric voltage coefficient (g₃₃) increased with BZ seed doping.

• Periodical: Key Engineering Materials (Volume 690)
• Pages: 114-119
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.690.114
• Online since: May 2016
• Authors: Piewpan Parjansri, Manlika Kamnoy, Uraiwan Intatha, Sukum Eitssayeam, Tawee Tunkasiri*
• Keywords: Electrical Properties, Microstructure, Molten Salt Method, Perovskite Phase, Seed-Induced Method

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