Effect of Co2O3Additive on Structure and Electrical Properties of 85(Bi1/2Na1/2)TiO3-12(Bi1/2K1/2)TiO3-3BaTiO3Lead-Free Piezoceramics
| Autor: | Fangyan Xie, Yudong Hou, Na Lei, Mankang Zhu, Hanchen Hu, Jian Chen, Hui Yan |
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| Rok vydání: | 2009 |
| Předmět: |
Diffraction
Valence (chemistry) Materials science Oxide Analytical chemistry Nanotechnology Microstructure Spectral line law.invention chemistry.chemical_compound chemistry law Lattice (order) visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Electron microscope |
| Zdroj: | Journal of the American Ceramic Society. 92:2039-2045 |
| ISSN: | 1551-2916 0002-7820 |
| DOI: | 10.1111/j.1551-2916.2009.03183.x |
| Popis: | In this paper, Co2O3-added-85(Bi1/2Na1/2)TiO3–12(Bi1/2K1/2)TiO3–3BaTiO3 (BNKB) lead-free piezoceramics were fabricated by the conventional solid oxide routine. By the use of X-ray photonic spectra, X-ray diffraction, and scanning electronic microscope, the valence state of Co cations, lattice distortion, and microstructures were investigated. It is revealed that the Co2O3 addition affects the concentration of Co3+ cations and changes the tetragonality c/a of the perovskite lattice. The variation in tetragonality and microstructure, combined with the acceptor doping behavior of Co2O3, play a determinant role in the depolarization temperature Td, mechanical quality factor Qm, and other electrical properties of the ceramics. The Td is elevated to 157°C for 0.5 mol% Co2O3 addition; and the Qm reaches a maximum of 626 at 1.5 mol% Co2O3 addition, which is in the highest flight compared with other BNKB ceramics reported until now. |
| Databáze: | OpenAIRE |
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