Harmonic Analysis of Polarization-Field & Strain-Field Loops in Aging PZT
Date
2004-09
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
New York State College of Ceramics at Alfred University. Kazuo Inamori School of Engineering.
Abstract
Lead Zirconate Titanate (PZT) is an important piezoelectric ceramic. Although
processed to yield excellent piezoelectric properties, PZT suffers from a long term aging
process in which the piezoelectric properties decrease by 0-5% per decade. This means
that if the polarization of PZT decreases 5% by the 1st day, it is expected to decrease 10%
by the 10th day and 15% by the 100th day and so on. Many studies have been done on
aging of PZT, but a single model has not been universally accepted. An motivation of
this research was to use harmonic analysis to study the aging of undoped and doped-PZT
as a function of time. A conventional testing method was performed along with a
harmonic analysis method to study aging of PZT. In addition, different applied field and
testing techniques were used for the harmonic analysis method. Results indicated that
aging of some parameters of harmonic analysis follow those of the conventional testing
method. In addition, results of harmonic analysis show that amplitudes and phase angles
of each harmonic change uniquely as a function of time. This phenomenon results in
change in shapes of longitudinal and polarization hysteresis loops with aging time. These
findings suggest that harmonic analysis is a promising new method for studying the aging
of PZT.
Description
Advisory committee members: William Carlson, David Earl, Steve Pilgrim. Dissertation completed in partial fulfillment of the requirements for the degree of Doctorate of Philosophy in Ceramics at the Kazuo Inamori School of Engineering, New York State College of Ceramics at Alfred University
Type
Thesis