Applied Physics A

, Volume 80, Issue 2, pp 333–336

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

Article

DOI: 10.1007/s00339-003-2210-9

Cite this article as:
Wang, X., Chan, H. & Choy, C. Appl. Phys. A (2005) 80: 333. doi:10.1007/s00339-003-2210-9

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.

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Department of Applied Physics and Materials Research CenterThe Hong Kong Polytechnic UniversityHong KongP.R. China

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