Structural and Electrical Properties of Ca²⁺ Substituted Pb[(Zr_0.52Ti_0.48)_0,98(Cr³⁺_0.5, Ta⁵⁺_0.5)_0,02]_0,96 P_0,04 O₃ Ceramics

Abstract:

Pb_1-x Ca _x [(Zr_0.52Ti_0.48)_0,98(Cr³⁺_0.5, Ta⁵⁺_0.5)_0,02]_0,96 P_0,04 O ₃ (x = 0,00, 0.02, 0.04, 0.06) ceramics were prepared using the conventional mixed-oxide route. The resultant samples were sintered at different temperatures and subsequently characterized in terms of both microstructure and dielectric properties to study the effects of sintering behavior. X-ray diffraction analysis reveals that all specimens are a pure perovskite phase without pyrochlore phase and exhibits a phase transition from a rhombohedral phase to the coexistence of rhombohedral and tetragonal phases with an increase of sintering temperature. The grain size first increases up to x = 0.02 and then decreases. Comparing with the undoped ceramics, the dielectric properties of the Ca-doped PZT–PCTP specimens are significantly improved. The results show that the ceramics sintered at 1180 ^°C have optimum electrical properties for x= 0.02: a high dielectric constant (ε_r = 16800) at T_c, a low dissipation factor (tanδ = 0.009) and a low resistivity (ρ= 0.09 ×10⁺⁴) (Ω.cm) at 1 kHz, which indicates that the PZT–CCTP ceramics are promising for lead practical applications.

• Periodical: Advances in Science and Technology (Volume 87)
• Pages: 18-23
• DOI: https://doi.org/10.4028/www.scientific.net/AST.87.18
• Online since: October 2014
• Authors: Louanes Hamzioui*, Fares Kahoul, Ahmed Boutarfaia
• Keywords: Dielectric Property, Perovskite, PZT Ceramic, Sintering, XRD

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