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Short Crack R-Curves in Ferroelectric and Electrostrictive PLZT

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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·m1/2. The linear elastic composition displays a flat R-curve. The R-curve behavior is attributed to ferroelastic toughening.

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