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Properties of Co-Doped 0.92(Na0.5Bi0.5) TiO3-0.08BaTiO3 Lead-Free Ceramics |
| JIANG Xiang-Ping1,2;ZHENG Yan-Yan1;JIANG Fu-Lan1;LIU Li-Hua1;KWOK Kin-Wing2;CHAN-WONG Lai-Wa2 |
| 1Department of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 3330012Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hong Kong |
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| Cite this article: |
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JIANG Xiang-Ping, ZHENG Yan-Yan, JIANG Fu-Lan et al 2007 Chin. Phys. Lett. 24 3257-3259 |
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Abstract Lead-free piezoelectric ceramics 0.92(Bi0.5Na0.5)TiO3-0.08BaTiO3+xmol% Co3+ (BNBT-Co, x=0--8) are prepared by the solid state reaction method. Effects of the amount of Co3+ on the electrical properties and phase transition are studied. The results indicate that the addition of Co3+ enhances the mechanical quality factor Qm significantly, whereas the dissipation factor tan δ has a minimum value at x=3.5. Meanwhile, addition of Co3+ leads to small decreases of piezoelectric constant d33, and planar electromechanical coupling kp. The present 0.92(Bi0.5Na0.5)TiO3-0.08BaTiO3+3.5mol% Co3+ ceramics exhibit good performance with mechanical quality factor Qm=910, piezoelectric constant d33=106pC/N, planar electromechanical coupling kp=10% and dissipation factor tanδ=1.1% at 1kHz. Saturated polarization hysteresis loops have been obtained for BNBT-Co ceramics. Two dielectric peaks at depolarization temperature Td and Tm appear in the curves of εT33 vs temperature for the pure BNBT ceramics. However, the first dielectric peak Td disappears after the addition of Co3+ which means that the transition from ferroelectric to antiferroelectric phase has been eliminated.
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| Keywords:
77.84.Dy
77.80.Bh
77.65.Bn
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Received: 17 June 2007
Published: 23 October 2007
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