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

We prepared a lead-free ceramic ( Ba 0.85 Ca 0.15 ) ( Ti 1 - x Zr x ) O 3 (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 micro...

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Veröffentlicht in:Bulletin of materials science 2017-09, Vol.40 (5), p.925-931
Hauptverfasser: Msouni, H, Tachafine, A, Aatmani, M El, Fasquelle, D, Carru, J C, El Hammioui, M, Rguiti, M, Zegzouti, A, Outzourhit, A, Daoud, M
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Sprache:eng
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Zusammenfassung:We prepared a lead-free ceramic ( Ba 0.85 Ca 0.15 ) ( Ti 1 - x Zr x ) O 3 (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 BaTiO 3 . 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 Zr 4 + 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 μ m for x = 0.02 to 13.5 μ m 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 d 33 = 148 pC N - 1 and K p = 27 % .
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-017-1445-6