TITLE

Ferroelectric properties of Pb[sub 1-3y/2]La[sub y](Zr[sub 0.4]Ti[sub 0.6])O[sub 3] structures with La concentration gradients

AUTHOR(S)
Boerasu, I.; Pintilie, L.; Kosec, M.
PUB. DATE
October 2000
SOURCE
Applied Physics Letters;10/2/2000, Vol. 77 Issue 14
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Graded ferroelectric (GF) structures were obtained by successive deposition of Pb[sub 1-3y/2]La[sub y](Zr[sub 0.4]Ti[sub 0.6])O[sub 3] films with different La contents on Pt/TiO[sub 2]Si substrates. The method used for deposition was sol gel. The final structure consists of four layers, starting from the Pt electrode to the top gold electrode: (1) no La; (2) 4% La; (3) 8% La; and (4) 12% La. Ferroelectric properties of the GF structure were investigated, and an anomalous shift of the hysteresis loop along the polarization axis was found. The sense of this shift depends on the initial direction of the ferroelectric polarization. The presence of hysteresis displacement "up" or "down" can be explained if the presence of a built-in charge in the GF structure is admitted. The built-in potential produced by this charge is computed using a simple theoretical model. © 2000 American Institute of Physics.
ACCESSION #
4412838

 

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