Short crack R-curves in ferroelectric and electrostrictive PLZT

Authors
Chen, W Lupascu, DC Rodel, J Lynch, CS
Citation
W. Chen et al., Short crack R-curves in ferroelectric and electrostrictive PLZT, J AM CERAM, 84(3), 2001, pp. 593-597
Citations number
21
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
84
Issue
3
Year of publication
2001
Pages
593 - 597
Database
ISI
SICI code
0002-7820(200103)84:3<593:SCRIFA>2.0.ZU;2-D
Abstract
This work describes the measurement of R-curve behavior in ferroelectric ce ramics using four-point bend specimens with controlled semielliptical surfa ce cracks. The results are compared for two compositions of lead lanthanum zirconate titanate. One exhibits ferroelastic behavior, the other electrost rictive linear elastic behavior. R-curves are measured in the crack length regime of 0.1 to 0.8 mm, The ferroelastic composition displays a toughness increase from 0.5 to 1.2 MPa.m(1/2) The linear elastic composition displays a flat R-curve. The R-curve behavior is attributed to ferroelastic toughen ing.