14 June 2000 Role of crack formation in the electric fatigue behavior of ferroelectric PZT ceramics
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The electric fatigue behavior of commercial lead zirconate titanate (PZT) was investigated by optical microscopy and instrumented Hertzian microindentation. Macroscopic delamination cracks were found near the electrodes after large numbers of electrical cycles. Additionally, macroscopics edge cracks were found to orientate from the boundary between electroded and unelectroded material. Instrumented Hertzian microindentation measurements on specimen cross sections show larger indentation depths just beneath the electrodes than in the center of the sample. This behavior may result form a higher microcrack density near the electrodes. The role of micro- and macrocracks in the electrical fatigue behavior of ferroelectric ceramics is discussed and compared to macroscopic material parameters and acoustic emissions.
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Doru Constantin Lupascu, Doru Constantin Lupascu, Juergen Nuffer, Juergen Nuffer, Jay S. Wallace, Jay S. Wallace, Juergen Roedel, Juergen Roedel, "Role of crack formation in the electric fatigue behavior of ferroelectric PZT ceramics", Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); doi: 10.1117/12.388205; https://doi.org/10.1117/12.388205

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