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Article Dans Une Revue Bulletin of Materials Science Année : 2017

Structural, dielectric and piezoelectric study of Ca-, Zr-modified BaTiO3 lead-free ceramics

Résumé

We prepared a lead-free ceramic (Ba0.85 Ca0.15)(Ti1−x Zrx )O3 (BCTZ) using the conventional mixed oxide technique. The samples were prepared by an ordinary mixing and sintering technique. In this study we investigated how small amounts of Zr 4+ can affect the crystal structure and microstructure as well as dielectric and piezoelectric properties of BaTiO3 . X-ray diffraction analysis results indicate that no secondary phase is formed in any of the BCTZ powders for 0 ≤ x ≤ 0.1, suggesting that Zr4+ diffuses into BaTiO 3 lattices to form a solid solution. Scanning electron microscopy micrographs revealed that the average grain size gradually increased with Zr 4+ content from 9.5 μm for x = 0.02 to 13.5 μm for x = 0.1; Curie temperature decreased due to the small tetragonality caused by Zr 4+ addition. Owing to the polymorphic phase transition from orthorhombic to tetragonal phase around room temperature, it was found that the composition x = 0.09 showed improved electrical properties and reached preferred values of d33 = 148 pC N−1 and Kp = 27%.

Dates et versions

hal-04280961 , version 1 (11-11-2023)

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Citer

H Msouni, M El Aatmani, M El Hammioui, Mohamed Rguiti, A Zegzouti, et al.. Structural, dielectric and piezoelectric study of Ca-, Zr-modified BaTiO3 lead-free ceramics. Bulletin of Materials Science, 2017, 40 (5), pp.925-931. ⟨10.1007/s12034-017-1445-6⟩. ⟨hal-04280961⟩
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