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Author Brewer, Steven J. ♦ Bassiri-Gharb, Nazanin ♦ Deng, Carmen Z. ♦ Callaway, Connor P. ♦ Paul, McKinley K. ♦ Fisher, Kenzie J. ♦ Guerrier, Jonathon E. ♦ Jones, Jacob L. ♦ Rudy, Ryan Q. ♦ Polcawich, Ronald G. ♦ Glaser, Evan R. ♦ Cress, Cory D.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ COBALT 60 ♦ ELECTRIC FIELDS ♦ ELECTRODES ♦ FERROELECTRIC MATERIALS ♦ GAMMA RADIATION ♦ HEALING ♦ HYSTERESIS ♦ INTERFACES ♦ IRIDIUM OXIDES ♦ IRRADIATION ♦ OZONE ♦ PERMITTIVITY ♦ PLATINUM ♦ POLARIZATION ♦ PZT ♦ STACKS ♦ THIN FILMS
Abstract The effects of gamma irradiation on the dielectric and piezoelectric responses of Pb[Zr{sub 0.52}Ti{sub 0.48}]O{sub 3} (PZT) thin film stacks were investigated for structures with conductive oxide (IrO{sub 2}) and metallic (Pt) top electrodes. The samples showed, generally, degradation of various key dielectric, ferroelectric, and electromechanical responses when exposed to 2.5 Mrad (Si) {sup 60}Co gamma radiation. However, the low-field, relative dielectric permittivity, ε{sub r}, remained largely unaffected by irradiation in samples with both types of electrodes. Samples with Pt top electrodes showed substantial degradation of the remanent polarization and overall piezoelectric response, as well as pinching of the polarization hysteresis curves and creation of multiple peaks in the permittivity-electric field curves post irradiation. The samples with oxide electrodes, however, were largely impervious to the same radiation dose, with less than 5% change in any of the functional characteristics. The results suggest a radiation-induced change in the defect population or defect energy in PZT with metallic top electrodes, which substantially affects motion of internal interfaces such as domain walls. Additionally, the differences observed for stacks with different electrode materials implicate the ferroelectric–electrode interface as either the predominant source of radiation-induced effects (Pt electrodes) or the site of healing for radiation-induced defects (IrO{sub 2} electrodes).
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-07-14
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 120
Issue Number 2


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