Abstract
Aging phenomena of 0.2PMN-0.8PZT multilayered ceramic actuators(MCA) have been investigated at the room temperature. The piezoelectric materials were synthesized as conventional ceramic process, and MCA were fabricatedby tape casting methods. The crystalline structures and lattice parameters were investigated by X-ray diffraction analysis, showing the structure was tetragonal and c/a was about 1.01. And, the effective electromechanical coupling coefficient keff and pseudo-piezoelectric constant <TEX>$d_{33}$</TEX>were measured. Variable unipolar electric fields, <TEX>$2{\sim}4kV/mm$</TEX>, were applied to MCh to investigate the aging characteristics. After 2 kV/mm unipolar electric field, keff and <TEX>$d_{33}$</TEX> were 0.454 and 4.44 respectively. The measured and simulated values using for aging phenomena analysis, had a good fit to the linear logarithmic stretched exponential law.
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