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Short Crack R ‐Curves in Ferroelectric and Electrostrictive PLZT
Author(s) -
Chen Wei,
Lupascu Doru C.,
Rödel Jürgen,
Lynch Christopher S.
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00704.x
Subject(s) - electrostriction , materials science , lead zirconate titanate , ferroelectricity , composite material , ceramic , fracture toughness , mineralogy , piezoelectricity , chemistry , dielectric , optoelectronics
This work describes the measurement of R ‐curve behavior in ferroelectric ceramics using four‐point bend specimens with controlled semielliptical surface cracks. The results are compared for two compositions of lead lanthanum zirconate titanate. One exhibits ferroelastic behavior, the other electrostrictive 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 toughening.