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(Bi0.5Na0.5)0.94Ba0.06TiO3 lead-free ceramics with simultaneous addition of CeO2 and La2O3

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Abstract

(Bi0.5Na0.5)0.94Ba0.06TiO3 (BNBT-6) with simultaneous addition of 0.5 mol% CeO2 and 0.25, 0.5 and 0.75 mol% La2O3, respectively, was prepared by a conventional ceramic fabrication technique. An addition of 0.5 mol% CeO2 together with 0.5 mol% La2O3 enhanced the piezoelectric and dielectric constant of BNBT-6 ceramics significantly. At room temperature, this composition exhibits a high piezoelectric constant (d33=162×10-12 C/N) and relatively low dielectric loss (cosδ=2.0%) at 1 kHz. X-ray diffraction pattern shows that the coexistence of tetragonal and rhombohedral phases in the BNBT-6 composition was not changed by adding CeO2+La2O3, and they diffused into the BNBT lattice during sintering. SEM observation indicates that a small amount of CeO2+La2O3 almost does not affect the microstructure.

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Authors and Affiliations

  1. Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hunghom Kowloon, Hong Kong, P.R. China

    X.X. Wang, H.L.W. Chan & C.L. Choy

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  1. X.X. Wang
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  2. H.L.W. Chan
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  3. C.L. Choy
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Correspondence to X.X. Wang.

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PACS

77.65.Bn; 77.84.Dy; 77.22.-d

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Wang, X., Chan, H. & Choy, C. (Bi0.5Na0.5)0.94Ba0.06TiO3 lead-free ceramics with simultaneous addition of CeO2 and La2O3. Appl. Phys. A 80, 333–336 (2005). https://doi.org/10.1007/s00339-003-2210-9

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  • DOI: https://doi.org/10.1007/s00339-003-2210-9

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