Influence of texture on the switching behavior of Pb(Zr{sub 0.70}Ti{sub 0.30})O{sub 3} sol-gel derived thin films
- Laboratoire de Ceramique, Ecole Polytechnique Federale de Lausanne, Lausanne (Switzerland)
Rhombohedral Pb(Zr{sub 0.70}Ti{sub 0.30})O{sub 3} thin films of four different well-defined textures, namely, (100), (111), and bimodal (110)/(111), and (100)/(111), were prepared by a sol-gel method. The films were characterized in terms of grain size, presence of second phases, surface roughness, columnarity of grains and other microstructural features. The dielectric, ferroelectric, and fatigue properties were investigated, with emphasis on the hysteresis switching characteristics. Results are discussed from the reference point of the allowable spontaneous polarization directions available for the different textures. The values of coercive field, remanent and saturation polarization, and slope of the loop at the coercive field, at saturating fields can be qualitatively explained based on the texture, independent of microstructural differences. The occurrence of surface pyrochlore, however, is observed to affect the functionality of the saturation curves, particularly for the samples of bimodal texture. Shearing of the hysteresis curves of the bimodal films is also attributed to surface microstructural features. The occurrence of nonswitching 71 or 190{degree} domains in the (111) and (110)/(111) textured films is hypothesized based on a comparison with the data from the (100) textured film. Corrected saturation polarization values agree with the spontaneous polarization values of rhombohedral PZT single crystals and published calculated values for rhombohedral PZT ceramics. The fatigue characteristics show increases in the switching component of polarization in the range 10{sup 3}{endash}10{sup 7} bipolar cycles, particularly for the (111) textured sample. Onset of fatigue is observed for all samples between 10{sup 7} and 10{sup 8} switching cycles. {copyright} {ital 1997 Materials Research Society.}
- OSTI ID:
- 467278
- Journal Information:
- Journal of Materials Research, Vol. 12, Issue 2; Other Information: PBD: Feb 1997
- Country of Publication:
- United States
- Language:
- English
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