Local fracture properties in ferroelectric relaxor PZN-4.5%PT single crystals

Local fracture properties in poled [Pb(Zn1/3Nb2/3)O3](1-x)-[PbTiO3]x (x=0.045, PZN-4.5%PT) ferroelectric relaxor single crystals were assessed. The crystals were cut along the [100], [010], and [001] planes. Scanning electron micrographs of Vickers indentations for two different crack orientations were used to determine the crack tip toughness (Ktip) and the local critical energy release rate (Gtip). Cracks oriented along the [010] and [110] crystal planes were found to have practically identical local fracture properties. These properties were determined using Stroh's formalism to account for the large anisotropic material coefficients.

[1]  W. Cao,et al.  Effective material properties in twinned ferroelectric crystals , 1999 .

[2]  Christopher S. Lynch,et al.  Relaxor ferroelectric PMN-32%PT crystals under stress and electric field loading: I-32 mode measurements , 2004 .

[3]  B. R. Lawn,et al.  A new mode of chipping fracture in brittle solids, and its application in a model for wear under fixed abrasive conditions I. mode of chipping fracture II. Wear model , 1975 .

[4]  Christopher S. Lynch,et al.  Ferroelectric properties of [110], [001] and [111] poled relaxor single crystals: measurements and modeling , 2003 .

[5]  Doru C. Lupascu,et al.  Effect of poling direction on R-curve behavior in PZT , 2000 .

[6]  W. Cao,et al.  Effective macroscopic symmetries and materials properties of multidomain 0.955Pb(Zn1/3Nb2/3)O3-0.045PbTiO3 single crystals , 2002 .

[7]  C. Lynch,et al.  Anisotropic Fracture Behavior in Ferroelectric Relaxor PZN–4.5%PT Single Crystals , 2005 .

[8]  P. C. Paris,et al.  On cracks in rectilinearly anisotropic bodies , 1965 .

[9]  R. McMeeking.  The energy release rate for a Griffith crack in a piezoelectric material , 2004 .

[10]  F. Fang,et al.  Indentation-induced cracking and 90° domain switching pattern in barium titanate ferroelectric single crystals under different poling , 2002 .

[11]  J. Qu,et al.  Interfacial dislocation and its applications to interface cracks in anisotropic bimaterials , 1991 .

[12]  T. Shrout,et al.  Ultrahigh strain and piezoelectric behavior in relaxor based ferroelectric single crystals , 1997 .

[13]  X. Tan,et al.  Indentation-induced domain switching in Pb(Mg1/3Nb2/3)O3–PbTiO3 crystal , 2001 .

[14]  Zhigang Suo,et al.  Fracture mechanics for piezoelectric ceramics , 1992 .

[15]  J. Rödel,et al.  Comparison of R‐Curves from Single‐Edge V‐Notched‐Beam (SEVNB) and Surface‐Crack‐in‐Flexure (SCF) Fracture‐Toughness Test Methods on Multilayered Alumina–Zirconia Composites , 2004 .

[16]  Thomas R. Shrout,et al.  Electric field dependence of piezoelectric properties for rhombohedral 0.955Pb(Zn1/3Nb2/3)O3– 0.045PbTiO3 single crystals , 1999 .