Dipolar defect model for fatigue in ferroelectric perovskites

Authors
Poykko, S Chadi, DJ
Citation
S. Poykko et Dj. Chadi, Dipolar defect model for fatigue in ferroelectric perovskites, PHYS REV L, 83(6), 1999, pp. 1231-1234
Citations number
27
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
6
Year of publication
1999
Pages
1231 - 1234
Database
ISI
SICI code
0031-9007(19990809)83:6<1231:DDMFFI>2.0.ZU;2-G
Abstract
A microscopic model for polarization fatigue in ferroelectric perovskites b ased on dipolar defects formed by the combination of oxygen vacancies and i mpurity metal ions is presented. The binding energy of an oxygen vacancy to a Pt impurity in PbTiO3 is calculated to be similar to 2.9 eV. The complex is strongly polar, is stabilized by electron capture, and pins the polariz ation of the surrounding lattice.