Effect of {ital B}-site cation stoichiometry on electrical fatigue of RuO{sub 2}//Pb(Zr{sub {ital x}}Ti{sub 1-{ital x}})O{sub 3}//RuO{sub 2} capacitors
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
There have been numerous reports that Pb(Zr{sub {ital x}}Ti{sub 1-{ital x}})O{sub 3} (PZT) thin-film capacitors with RuO{sub 2} electrodes and compositions near the morphotropic phase boundary exhibit minimal decrease in switched polarization with electric-field cycling. We show that the fatigue performance of RuO{sub 2}//PZT//RuO{sub 2} capacitors strongly depends on PZT film composition. Specifically, we demonstrate that the rate of polarization fatigue increases with increasing Ti content for PZT thin films of tetragonal crystal symmetry deposited on RuO{sub 2} electrodes. As the Ti content of the PZT films increased, the film gain morphology changed from columnar to granular and the volume percent of a fluorite-type second phase decreased. These microstructural trends and the possibility that the electrode material acts as a sink for oxygen vacancies are discussed to explain the fatigue dependence on {ital B}-site cation ratio for PZT films with RuO{sub 2} electrodes. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 253443
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 2 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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