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Domain structures of 001-, 110-, and 111-oriented NaNbO3 (NN) films deposited on SrRuO3/(001), (110), and (111)SrTiO3 (STO) substrates, respectively, were characterized by a laser beam scanning microscope (LSM) and a piezoresponse force microscope (PFM). The 001-oriented NN film had antiferroelectric 90° domains with 100 and 010 polarization axes and 90° domain walls exhibiting piezoresponse. The...
We have investigated the effects of high-oxygen-pressure crystal growth of ferroelectric Bi4Ti3O12 on the polarization properties along the a(b)-axis. Domain observations by piezoresponse force microscope demonstrate that a small remanent polarization (Pr) for the crystals grown at 0.02MPa is attributed to the clamping of 90?? domain walls by oxygen vacancies. The vacancy formation of Bi and O during...
Potassium sodium bismuth titanate (KNBT) ceramics have useful dielectric and piezoelectric properties, and are candidates for higher temperature (>200_C) applications than possible with PZT. A diffuse transformation to the cubic state occurs above 500_C. At lower temperatures, relaxor-type behavior is observed around 200_C. We report ferroelectric and piezoelectric properties for poled ceramics...
Potassium sodium bismuth titanate (KNBT) ceramics have useful dielectric and piezoelectric properties, and are candidates for higher temperature (≫200_C) applications than possible with PZT. A diffuse transformation to the cubic state occurs above 500_C. At lower temperatures, relaxor-type behavior is observed around 200_C. We report ferroelectric and piezoelectric properties for poled ceramics as...
We have investigated the effects of high-oxygen-pressure crystal growth of ferroelectric Bi4Ti3O12 on the polarization properties along the a(b)-axis. Domain observations by piezoresponse force microscope demonstrate that a small remanent polarization (Pr) for the crystals grown at 0.02MPa is attributed to the clamping of 90° domain walls by oxygen vacancies. The vacancy formation of Bi and O during...
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