Ferroelectric 0.7BiFeO 3 -0.3PbTiO 3 (BFO-PT) films were deposited on stainless steel substrates by the sol-gel method. A thin layer of PbTiO 3 (PT) was introduced between the substrates and BFO-PT films in order to decrease the annealing temperature of BFO-PT films. X-ray diffraction analysis reveals that BFO-PT films could be well crystallized into the perovskite structure at about 575 o C. Scanning electron microscope (SEM) images show that BFO-PT thin films have grain size of about 50~60 nm. Our results indicated BFO-PT films deposited on stainless steel substrates maintained the excellent ferroelectric properties with remnant polarization of about 40~50 μC/cm 2 .
The 0.6(Bi 0.85 La 0.15 )FeO 3 -0.4PbTiO 3 (BLF-PT) ceramics were prepared by tape casting method. Effects of binder (polyvinylbutyl dibutyl PVB), plasticizer (phthalate-polyethylene glycol DBP-PEG) and dispersant (triethylolamine, TEA) concentration on the rheological properties of BLF-PT slurry were investigated. The optimized component ratio for ceramics powders, binder, plasticizer, dispersant and solvent (ethanol, EtOH) in the slurry was 50 wt.%, 4 wt.%, 6 wt.%, 1 wt.% and 39 wt.%. The dielectric constant r , loss tan , and remnant polarization P r of BLF-PT ceramics laminated from the tapes were 525 (1 kHz), 1.7% (1 kHz) and 30 C/cm 2 (45 kV/cm), respectively, which were comparable to those of BLF-PT ceramics prepared by traditional solid state reaction method.
0.6(Bi0.9La0.1)FeO3–0.4Pb(Ti1−xMnx)O3 (BLF–PTM) piezoelectric ceramics with different Mn contents were fabricated by a sol–gel process combined with a solid-state reaction method. Coexistence of rhombohedral and tetragonal phases is detected in BLF–PTM. An asymmetric P–E loop with a large internal dipolar field of >20 kV cm−1 is observed in the poled BLF–PTM ceramics of x = 0.01 and 0.02, which is the typical characteristic of hard piezoelectric materials for higher power applications. The dielectric loss, planar coupling coefficient kp, mechanical quality factor Qm, vibration velocity, and Curie temperature of 0.006, 0.338, 418, 1.1 m s−1, and 470 °C have been achieved for BLF–PTM with x = 0.01. Furthermore, the elastic nonlinear phenomena in BLF–PTM are investigated by measuring the vibration strain at high electric fields. Upon using Mn doping, BLF–PTM exhibits a large vibration strain and a small resonance frequency shift. The nonlinear elastic compliance of BLF–PTM for x = 0.01 and 0.02 was dramatically decreased by about two orders of magnitude compared to that of BLF–PT for x = 0.
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