TITLE

Local switching properties of dense nanocrystalline BaTiO[sub 3] ceramics

AUTHOR(S)
Mitoseriu, Liliana; Harnagea, Catalin; Nanni, Paolo; Testino, Andrea; Buscaglia, Maria Teresa; Buscaglia, Vincenzo; Viviani, Massimo; Zhe Zhao; Nygren, Mats
PUB. DATE
March 2004
SOURCE
Applied Physics Letters;3/29/2004, Vol. 84 Issue 13, p2418
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The switching properties of dense BaTiO[sub 3] ceramics with 50 nm average grain size were investigated at local scale by piezoresponse force microscopy. Large areas with low piezoelectrical activity beside islands with strong piezoresponse were found. The application of electric fields induces stable domain structures and changes in the polarization state far away from the probing area, probably via trans-granular dipole interactions. Piezoelectric hysteresis loops were recorded on various positions, even in regions with initial zero piezoresponse, which possibly showed a superparaelectric behavior. The results are incontestable proof that 50 nm BaTiO[sub 3] ceramics retain ferroelectricity at a local scale. © 2004 American Institute of Physics.
ACCESSION #
12606827

 

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