Abstract
Lanthanum doped bismuth layer structured ferroelectrics (BLSFs) Ca 1- x La x Bi 4(Ti 0.9W 0.1) 4O 15( x = 0, 0.2. 0.3, 0.4, 0.6) ceramics were prepared by solid-state reaction method. X-ray diffraction (XRD) patterns showed that single phase was formed when x = 0 ∼ 0.6. The effects of La 3+ doping on dielectric, piezoelectric and ferroelectric properties of Ca 1- x La x Bi 4(Ti 0.9W 0.1) 4O 15 ceramics were studied. Ca 0.7La 0.3Bi 4(Ti 0.9W 0.1) 4O 15 ceramic had optimal properties, its dielectric constant was 166.85, dielectric loss was 0.0063, piezoelectric strain constant was 11 pc·N −1. remanent polarization was 18.1 μC·cm −2 and coercive field was 118 kV·cm −1. SEM micrographs showed that the grains of CaBi 4Ti 4O 15-based ceramics were plate-like. The results of energy spectrum analysis (EDS) showed that La 3- incorporation could increase Bi/Ca ratio.
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