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The compositional dependent fracture behavior of soft PZT ( Pb 0.99 Ba 0.01 (Zr 1− x Ti x ) 0.98 Nb 0.02 O 3 ) ceramics in the vicinity of the morphotropic phase boundary was characterized using compact‐tension specimens. The compositions with 0.40 ≤ x ≤ 0.55 displayed an increasing fracture resistance with crack extension ( R ‐curve behavior). It was observed that the rhombohedral composition and the compositions near the morphotropic phase boundary showed the largest toughness enhancement. R ‐curve behavior was found to be influenced by the ferroelastic coercive stress, saturated remanent strain, and elastic modulus, which were experimentally measured for each composition. X ‐ray diffraction measurements were performed and compared to the fracture results to investigate the impact of phase and lattice distortion on ferroelastic toughening behavior.
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Seo et al. (2011) studied this question.
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