Polarization Switching of and Electron Emission from Lead Lanthanum Zirconate Titanate Ceramics
This paper focuses on understanding the influence of ma-terial properties on the complicated ferroelectric (FE) emis-sion process. Three different compositions in the lead lan-thanum zirconate titanate (PLZT) system were chosen for study, based on their widely different dielectric and ferro-electric properties: antiferroelectric (AFE) 2/95/5, “nor-mal” ferroelectric 8/65/35, and nonferroelectric 15/65/35. Repeatable emission was obtained from the 2/95/5 compo-sition, which could also be modulated at high frequency (200 kHz). the fast AFE ⇆ FE phase transition is respon-sible for the FE emission properties of this material, which is supported by the relationship between the switching cur-rent and the emission current. Comparatively, FE emission from the 8/65/35 composition degraded rapidly, which was attributed to decreases in the remanent polarization. No emission signal was detected from the 15/65/35 composi-tion, because no switching activity occurs, which can be interpreted as additional evidence that electron emission from the previously mentioned two compositions was in-deed a FE emission process.
W. Zhang et al., "Polarization Switching of and Electron Emission from Lead Lanthanum Zirconate Titanate Ceramics," Journal of the American Ceramic Society, Wiley-Blackwell, Dec 2004.
The definitive version is available at http://dx.doi.org/10.1111/j.1151-2916.1999.tb01806.x
Materials Science and Engineering
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