Mechanical and piezoelectric behavior of thin film PZT composites for MEMS applications

S. Yagnamurthy, Ioannis Chasiotis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The elastic and failure mechanical properties, the d31 piezoelectric coefficient and the effect of applied stress on the hysteresis curves of freestanding PZT composite films, comprised of SiO2, Pt, PZT and Pt, were measured from microscale tension specimens. The d31 coefficient was measured from the out-of-plane deflection of biased PZT specimens with dimensions similar to those of MEMS components. An analytical solution for the bending of a multilayered piezoelectric beam was used to compute a first estimate of d31 as 176±27 pm/V. The field induced in-plane stress hysteresis loops were asymmetric at small in-plane stresses becoming of similar magnitude as the applied stress was increased beyond 300 MPa. Similarly, the intersection of the hysteresis loops shifted from negative to positive electric field at stresses larger than 150 MPa. The applied stress resulted in reduction of the hysteresis magnitude due to mechanical constraints imposed on 90° domain switching. The effect of high in-plane stress on domain switching was also the reason for the hysteretic non-linear stress-strain curves that were recorded for unbiased PZT films.

Original languageEnglish (US)
Title of host publicationSociety for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010
Pages2170-2175
Number of pages6
StatePublished - Nov 9 2010
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010 - Indianapolis, IN, United States
Duration: Jun 7 2010Jun 10 2010

Publication series

NameSociety for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010
Volume3

Other

OtherSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010
CountryUnited States
CityIndianapolis, IN
Period6/7/106/10/10

ASJC Scopus subject areas

  • Mechanics of Materials

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  • Cite this

    Yagnamurthy, S., & Chasiotis, I. (2010). Mechanical and piezoelectric behavior of thin film PZT composites for MEMS applications. In Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010 (pp. 2170-2175). (Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010; Vol. 3).