Biaxial Flexural Strength of Poled Lead Zirconate Titanate under High Electric Field with Extended Field Range

Journal Article · Mon Dec 31 23:00:00 EST 2012 · Ceramics International

DOI:https://doi.org/10.1016/j.ceramint.2012.08.054· OSTI ID:1055534

Zhang, Kewei ^[1]; Zeng, Fan W ^[1]; Wang, Hong ^[1]; Lin, Hua-Tay ^[1]

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1. ORNL

In the present work, as-received poled lead zirconate titanate, or PZT 5A, was examined using ball-on-ring (BoR) mechanical testing coupled with an electric field. Electric fields in the range of 4Ec (Ec, coercive field) with controlled loading paths were applied, and mechanical tests at a substantial number of characteristic electric field levels were conducted. Commercial electronic liquid FC-40 was used to prevent the setup from dielectric breakdown under a high electric field. Weibull strength distribution was used to interpret the mechanical strength data. The data showed that the strength levels of the PZT-5A tested under OC (open circuit) in air and in FC-40 were almost the same. It was further revealed that , for the studied cases, the effect of loading history on the biaxial flexural strength of the PZT was significant in -Ec, but not in OC or zero field as well as 4Ec . An asymmetry V curve was observed for the characteristic strength-electric field graph, and the bottom of V curve was located near the negative coercive field. Microscopy analysis showed that surface-located volume-distributed flaws were the strength limiter and responsible for the failure of the tested PZT under electromechanical loadings.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1055534
• Journal Information: Ceramics International, Journal Name: Ceramics International Journal Issue: 2 Vol. 39; ISSN 0272-8842
• Country of Publication: United States
• Language: English