Enhanced Dielectric Properties of Ba_0.85Sr_0.15TiO₃ Ceramic by 8% Zirconium Doping

Abstract:

The dielectric properties and crystal structure of Ba_0.85Sr_0.15TiO₃ and Ba_0.85Sr_0.15Ti_0.92Zr_0.08O₃ ceramics were studied. The samples were synthesized by using solid-state method. The results show that the samples were single phase. The Ba_0.85Sr_0.15TiO₃ exhibited tetragonal structure (space group P4mm), while with addition of 8 mol% Zr into Ba_0.85Sr_0.15TiO₃ it shows that the sample exhibited orthorhombic structure (space group Amm2). The dielectric constant value increased from 1094 for pure, up to 4211 for Ba_0.85Sr_0.15Ti_0.92Zr_0.08O₃ ceramic at T_c measured at 1 kHz. The T_c decreased from 80 °C down to 60 °C as 8 mol% Zr ions doped into Ba_0.85Sr_0.15TiO₃ composition. The Ba_0.85Sr_0.15Ti_0.92Zr_0.08O₃ ceramic exhibited lower dielectric loss, tan δ about 0.006 compared to Ba_0.85Sr_0.15TiO₃ ceramic (tan δ = 0.009) when measured at 110 °C with frequency 1 kHz. The slope at low frequency region in capacitance vs frequency plot for both samples attributed by the grain boundary effect, whereas the high frequency plateau associated with the bulk response. The impedance spectroscopy analysis results show that both samples are dominated by the bulk response when an incomplete semicircle arc was observed in Zʺ vs Zʹ plot.

• Periodical: Advances in Science and Technology (Volume 118)
• Pages: 53-58
• DOI: https://doi.org/10.4028/p-55338t
• Online since: September 2022
• Authors: Ku Noor Dhaniah Ku Muhsen*, Nadia Nasika Nasir, Rozana Aina Maulat Osman, Mohd Sobri Idris, Nur Izzati Muhammad Nadzri, Domingo Arturo Ruiz León
• Keywords: BaTiO₃, Ceramic, Dielectric, Impedance Spectroscopy, X-Ray Diffraction

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